Service Manual

17-inch Color Monitor

S7500/MV7500/CV7500
 HP S7500/MV7500/CV7500

Service Manual Versions and Revision

No. Version Release Date Revision

1. 1.0 FEB. 27, 2003 Original release

Copyright Trademarks
Copyright 2002 LiteOn Technology Corp. LiteOn is a registered trademark of LiteOn
TechnologyCorp.
All Rights Reserved
All other trademarks are the property of their
This manual may not, in whole or in part, be
respective owners.
copied, photocopied, reproduced, translated, or
converted to any electronic or machine readable
form without prior written permission of LiteOn
Technology Corp.
HP S7500/MV7500/CV7500 Service Manual.
Printed in Taiwan.

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 HP S7500/MV7500/CV7500

Table of Contents

1. Precautions ................................................................................................................. 2

2. Product Specifications .............................................................................................. 5

3. Operation Theory .....................................................................................................10

4. Alignmentsand Adjustments ...................................................................................14

5. Troubleshooting ........................................................................................................18

6. Recommended Spare Parts List ..............................................................................24

7. BlockDiagram ..........................................................................................................26

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 HP S7500/MV7500/CV7500

1 Precautions
Follow these safety and servicing precautions to prevent damage and to protect against potential hazards
such as electrical shock and X-rays.

1-1 Safety Precautions nonmetallic control knobs, insulating materials,

cabinet backs, adjustment and compartment
covers or shields, isolation resistor-capacitor
1-1-1 Warnings networks, mechanical insulators, etc.
1. For safety purpose, do not attempt to modify 3. AC Leakage Current Check
the circuit board, and always disconnect the AC Always perform the AC Leakage Current
power before performing servicing on the Check on the exposed metal parts, including
monitor. metal cabinets, screwheads and control shafts,
2. Operation of the monitor outside its cabinet or as follows:
with the cover removed involves the risk of a) Plug the AC line cord directly into a rated
shock hazard. Repair work on the monitor AC outlet. Do not use an isolation
should only be attempted by service personnel transformer during the check.
who are thoroughly familiar with all necessary
b) Use an AC voltmeter with at least 5000
safety precautions and procedures for working
ohms per volt sensitivity as follows:
on high voltage equipment.
Connect a 1500 ohms, 10 watt resistor
3. Do not lift the CRT by the neck. After
paralleled by a 0.15uF AC capacitor in series
completely discharging the high voltage anode,
with all exposed metal cabinet parts and a
handle the CRT only when wearing shatterproof
known earth ground, such as electrical
goggles. Try to keep the CRT away from the
conduct or electrical ground connected to
body during handling.
earth ground, as shown in the Figure 1-1.
4. High voltage should always be kept at the rated Measure the AC voltage across the
value, no higher. Only when high voltage is combination of resistor and capacitor.
excessive are X-rays capable of penetrating the
shell of the CRT. Operation at high voltages Figure 1-1. Set Up For AC Leakage Current Check
may also cause failure of the CRT or high
voltage circuitry.
5. The CRT is especially constructed to limit X-
ray emission to 0.5mR/HR at 300 microamperes
anode current. To ensure continued X-ray
To known To exposed metal
protection, replace the CRT with only the same earth ground cabinet part
or equivalent type as the original, and adjust the 0.15ufd
anode’s voltage to the designated maximum
rating, never to exceed.
1500 ohm 10 watt

1-1-2 Safety Checks

Before returning the monitor to the user, perform
c) Reverse the AC plug at the AC outlet and
the following safety checks:
re pe at t he s te ps fo r AC v ol ta ge
1. Inspect to make certain that each lead dress is measurements for each exposed metal part.
not pinched or that hardware is not lodged
d) Voltage reading must not exceed 0.3 volts
between the chassis and other metal parts in
RMS, equivalent to 0.2 milliampere AC. Any
the monitor.
value exceeding this limit ill constitute a
2. Inspect all protective devices such as potential shock hazard and must be
corrected immediately.

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 HP S7500/MV7500/CV7500

1-1-3 Product Safety Notices

Many electrical and mechanical parts in this chassis have special safety-related characteristics which are
often not evident from visual inspection, the protection afforded by them may not be obtained by replacing
them with components rated for higher voltage, wattage, etc. Before replacing any of these components,
consult the Recommended Spare Parts List given at the end of this manual. Any of the replacements that do
not provide the same safety characteristics may result in shock, fire, X-ray emission or other hazards.

1-2 Servicing Precautions

Warning: An electrolytic capacitor installed with the wrong polarity might explode.
Caution: Before performing servicing covered by this service manual, read and follow the Safety Precautions
section of this manual.
Note: If unforeseen conflict between the following servicing precautions and any of the safety
precautions, always follow the safety precautions
1. Follow closely the servicing precautions printed on the monitor cabinet and chassis.
2. Always unplug the AC power cord from the AC power source before removing or installing any component
or assembly, disconnecting PCB plugs or connectors and connecting a test component in parallel with a
capacitor.
3. When replacing parts or circuit boards, clamp the lead wires around the component before soldering.
4. When replacing a high wattage resistor (>0.5W metal oxide film resistor) in the circuit board, keep the
resistor about 1 cm (1/2 inch) away from the circuit board.
5. Keep wires away from the high voltage or high temperature components.
6. Keep wires in their original positions so as to minimize interference.
7. Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the
positive lead; always remove the instrument’s ground lead last.

After putting the rear cover back and make sure the monitor is working properly, the Hi-Pot &
Ground Continuity tests MUST BE performed before the monitor is returned to user.

1-3 Hi-Pot Test

1. Test Equipment
Puncture test model PM5530 ADT or KIKUSU TOS-8750 voltage tester or equivalent approved equipment.
Note : The test equipment must be calibrated in regular period.
2. Test Setup
a) Apply voltage : DC 2100 VDC
b) Test duration : 3 seconds
c) Cutoff current should be set to 3 mA
3. Test Procedure
a) Unplug power cord from AC source.
b) Put the power switch of the monitor in the “ON” position.
c) Leave signal cable un-connected.

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d) Plug monitor power cord to the Hi Pot tester terminals.

e) Turn on tester and watch the indicator or beeper.
f) If the indicator lamp lighten, or beeper beeps, the test fails.

1-4 Ground Continuity Test

1. Test Equipment
AC low ohm tester TOS-6100 or equivalent approved equipment.
Note : The test equipment must be calibrated in regular period.
2. Test Setup
a) Test duration : 3 seconds
b) Set current limit at 25 A
c) The grounding resistance must be less than 0.1 ohm.
3. Test Procedure
a) Plug the monitor power cord to the tester terminals.
b) Make sure all connections are well-contacted.
c) Turn on monitor power and tester power.
d) Press “Test” button.
e) If green light shows up, means test OK.
If red light shows up, means test fails.
f) If the Tester has a digital display, the resistance value must not exceed 0.1 ohm.
Note : Be sure not to touch the metal portion of the signal cable head during testing.

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2 Product Specifications

2-1 Specifications
17-inch (16-inch Visual image area), sloted mask, 90 degrees
deflection, dot type black matrix, medium short persistence
Picture Tube
phosphor, dark tint, non-glare/ anti-static screen,
0.27 mm dot pitch for E1770NSL/T and 0.25mm dot pitch for HP
S7500/MV7500/CV7500

VGA, Super VGA, 1024x768@60/70/75/85 Hz

Scanning Frequency
1280x1024@60Hz

Maximum Resolution 1280 dots (H) x 1024 lines (V) @60Hz refresh rate

Display Area 306 mm (H) x 230 mm (V) typical

Display Characters 80 char. x 60 rows on a 10 x 10 matrix

Display Colors Analog

Unlimited Colors
Input

Synchronizatin Signals Separate Sync: horizontal/vertical, TTL, positive or negative

Synchronization Horizontal : 30 to 70 kHz

Frequencies Vertical : 50 to 140 Hz

Signal Connectors 15-pin, D-shell connector

Video Signals Analog : 0.7 Vp-p, RGB positive

Power Input 75 Watts (maximum) AC rated voltage, 100VAC to 240VAC

Misconvergence Center Area : < 0.3 mm; Corner Area : < 0.4mm

User Controls Power On/Off, Contrast, Brightness, Horizontal Size, Horizontal

Position, Vertical Size, Vertical Position, Pincushion, Trapezoid,
Rotation, Color temperature, Language, Display Frequency,
Degauss, Recall, H. Moire,
V. Moire

Service Controls PWB-1709

PWB-1707 : power voltage adjust (VR801)

Preset Modes 8 (see Table 2-2. Timing Chart)

Environmental O p e r a t i o n t e m p e r a t u r e : 1 0 oC t o 4 0 oC a m b i e n t
Considerations Operation Humidity : 20% to 80% ambient
S t o r a g e t e m p e r a t u r e : - 4 0o C t o 6 5 o C a m b i e n t
Storage Humidity : 10% to 90% (non-condensing)
Altitude : Non operating 40,000 feet sea level
operating 10,000 feet sea level

Note: Above specifications are subject to change without prior notice.

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2-2 Signal Cable Pin Connections

Table 2-1. Signal Cable Pin Assignment

Pin Signal Pin Signal

1 Red video 9** +5V
2 Green video 10 Digital Ground
3 Blue video 11 Ground
4 Ground 12 SDA
5* NC 13 H-Sync
6 Red ground 14 V-Sync/VCL
7 Green ground 15 SCL
8 Blue ground

Note * This pin is used for selftest detection. Connect this pin to ground at the PC end.
** For PC 99: This pin will provide +5V from PC side.

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2-3 Timing Chart

This section describes the timings that the computer industry recognizes as standard for computer-generated
video signals.
Table 2-2. Timing Chart

Mode 1 2 3 4 5 6 7 8 9

H. Dots 640 720 640 640 800 800 1024 1024 1280

V. Dots 480 400 480 480 600 600 768 768 1024

H-freq (kHz) 31.47 31.47 37.5 43.27 46.8 53.67 60.02 68.68 63.98

Sync Polarity - - - - + + + + +

A period us 31.78 31.78 26.666 23.11 21.333 18.63 16.66 14.56 15.63

B Blanking us 6.356 6.356 6.349 5.33 5.172 4.409 3.657 3.725 3.778

C Sync us 3.81 3.81 2.032 1.556 1.616 1.138 1.219 1.016 1.037

D B.P. us 1.907 1.907 3.81 2.22 3.232 2.702 2.235 2.201 2.296

E Active us 25.42 25.42 20.37 17.78 16.162 14.22 13 10.836 11.852

F F.P. us 0.636 0.636 0.51 1.556 0.323 0.569 0.203 0.508 0.444

V-freq (Hz) 59.95 70.08 75 85 75 85 75.03 85 60.02

Sync Polarity - + - - + + + + +

O Period ms 16.68 14.27 13.3 11.76 13.333 11.76 13.33 11.77 16.661

P Blanking ms 1.43 1.557 0.533 0.67 0.533 0.578 0.533 0.582 0.656

Q Sync ms 0.064 0.064 0.08 0.069 0.064 0.056 0.05 0.044 0.047

R B.P. us 1.02 1.08 0.427 0.578 0.448 0.503 0.466 0.524 0.594

S Active us 15.25 12.71 12.8 11.09 12.8 11.18 12.8 11.18 16.005

T F.P. us 0.35 0.413 0.027 0.023 0.021 0.019 0.017 0.015 0.016

Seperate Sync
K
Horizontal E Vertical
B H
Video Video

D F J L

Sync Sync

C I
A G

H.Parameters: V.Parameters:
A: Period B: Blanking Time G: Period H: Blanking Time
C: Sync Width D: Back Porch I: Sync Width J: Back Porch
E: Active Time F: Front Porch K: Active Time L: Front Porch

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 HP S7500/MV7500/CV7500

2-4 Power Saving Function

Note: The monitor will be driven into “Power Saving” mode by the control signal from the display
controller, as indicated by the amber-color power LED.

Table 2-3. Power Saving Function

State Power LED

Consumption Light

ON Normal* Green

Active <5 watts Amber

OFF

The power saving states will be kept until a control signal has been detected or the keyboard or mouse is
activated. The recovery time from Active OFF state back to ON state is around 10 seconds.

* For power consumption : 75W Max. (@ 230V AC, preset size and maximum light output condition)

2-5 TCO Version (Optional)

The monitor meets the TCO 95/99, NUTEK energy saving, electric and magnetic field requirements.
Also it is compliant with TCO 95/TCO 99 labelling scheme.
The emission from magnetic and electric field must comply with the limits specified by the Swedish Board
for Measurement and Testing, commonly known as MPR 1990 recommendations. These limits are sum-
marized in the Table 2-4.

Table 2-4. TCO 95 Emission Requirements

VLF/TCO ELF/TCO

Magnetic Field 25 nT 200 nT

Electric Field 1 V/m 10 V/m

Frequency Range 2~400 kHz 5~2000 Hz

Value RMS RMS

Distance 30 cm 30 cm

Electrostatic
+/- 500 V +/- 500 V
Potential

The monitor is designed with selected CRT and carefully routed wires around CRT, make sure exactly the

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 HP S7500/MV7500/CV7500

same routing scheme is used when doing CRT replacement.

2-5-1 TCO 95 Version (Optional)

The TCO 95 scheme is for international and environmental labelling of personal computers. The labelling
scheme was developed as a joint effort by the TCO (The Swedish Confederation of Professional Employ
ees), Naturskyddsforeningen (The Swedish Society for Nature Conservation) and NUTEK (The National
Board for Industry and Technical Development in Sweden).
1)`Scope
TCO 95 touches on ergonomic qualities, emissions (electrical and magnetic fields), energy efficiency and
ecology (with demands for environmental adaptation for both the product and the production processes at
the manufacturing plant).
2) EnvironmentalRequirements
The monitor abides by the environmental demands concerning restrictions on the presence and use of
heavy metals, brominated and chlorinated flame retardants, CFCs (freons), and chlorinated solvents, among
other things. The monitor is also recyclable.
3) Energy Requirements
The monitor also follows the energy requirements that, after a certain period of inactivity, the monitor shall
reduce its power consumption to a lower level in one or more stages.
4) Others
The monitor meets the strict environmental demands for the reduction of electric and magnetic fields,
physical and visual ergonomics and good usability.
Table 2-5. TCO 95 Visual Ergonomics

Feature Standard Description

Linearity 1% or less Difference in length of columns or rows compared to the

corresponding lengths through the center of the monitor.

Display Luminance 100 cd/m2 (at least)

Luminance 1.7:1 or less The ratio is between the max to min luminance within the
Uniformity whole active area.

2-5-2 TCO 99 Version (Optional)

TCO 99 will append the color temperature and energy efficiency specification, also cover the environmen-
tal requirement.

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3 Operation Theory
This is a fully digital controlled multi-sync color monitor that is compliant with DDC1 and 2B Plug and Play
VESA standard and offers the following main features.

3-1 Main Features

1. Simplified design with minimum components.
2. The NOVA NT6865 32 processor-- that has I2 C BUS controlled geometric correction, contrast and
brightness-- offers the functions for: (a) Contrast, (b) Brightness, (c) H-size, (d) H-position, (e) V-size, (f)
V-position, (g) Pincushion, and (h) Trapezoid.
In addition, it also offers more functions as: (a) Sync. processor, I/P and O/P, (b) Mute, (c) Power saving
- Suspend & Stand-By, (d) Power saving override, (e) DDC1/2B, (f) I2 C Bus for auto-alignment through
signal cable (g) CS1/CS2/CS3/CS4 for linearity and size compensation.
3. Stores up to 10 factory preset modes and offers 8 user modes. There are 16 function icons at OSD. They
are controlled by 1 2 keys on front panel.
4. Powerful PHILIPS TDA4863AJ A5 and TDA4841 present the following useful functions: (a) Pincushion,
(b) Trapezoid, (c) V-Position, (d) V-Size, (e) Vertical’s “C” and “S” correction -- factory adjust, (f)
Pincushion’s V. position correction, (g) Corner correction -- factory adjust, (h) Pincushion unbalance
correction -- factory adjust, (i) Parallelogram distortion -- factory adjust, (j) Moire cancellation, (k) X-ray
protection, and (l) Full horizontal and vertical auto sync capability.
5. Software controlled auto shut off function activated if fH < = 29 kHz and fH > = 70 kHz.
6. Full range AC input and simplified line filter design.

3-2 Microcontrol Section

1. This monitor uses NOVA NT6865 CPU. It contains a 8051 8-bit CPU core, 512 bytes of RAM used as
working RAM and stack area, 32k bytes of MASK ROM, 10-channel 8 bit PWM D/A converter, 4-
channel A/D converters for key detection saving I/O pins, internal H. sync and V. sync signals processor
providing mode detection, and an I2 C bus interface. When H/V sync through D-Sub signal cable enter pin
41 and pin 42, the CPU performs frequency / polarity detection and calculate and send to H/V sync OUT.
Then CPU reads the data from I703 and transfer to device 4841 and some DAC in CPU, above operation
takes about 500 ms.
2. There allowed 8 factory preset modes and 8 user modes. There are 11 functions, Contrast, Brightness, H.
Size, H. Position, V. Size, V. Position, Pincushion, and Trapezoid, Rotation, H. Moire, V Moire, all controlled
by OSD icon which can be adjusted by user.
3. The pin 25 and pin 26 are used for ATE function. When CPU receives C6 as slave address, it will operate
in ATE mode which is used for auto-alignment. After alignment the data will be stored in I703.
4. The user control parameters are selected by OSD icons, through 1 & 2 keys, they are detected
by sensing the voltage through R710, R740, R741, R743, J007, J008 to pin 16 and 17 of I701.

3-3 Deflection Section

1. I2 C -- autosync deflection controller is TDA4841.
2. The TDA4841 is a high performance and efficient solution for autosync monitors. All functions are
controllable by I2 C bus. SDA and SCL signals coming from microprocessor feed to pin 12 and pin 13 to
control all functions.

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3-3-1 Horizontal Section

1. The oscillator is driven by the currents in R419 and R420. The minimum oscillator frequency is determined
by R419 and the maximum frequency is determined by R420.
2. Horizontal sync goes into pin 15 through R318. And horizontal flyback pulse goes into pin 1 through R401
from pin 5 of FBT for HFLB loop.
3. Horizontal driver (pin8) O/P to Q401 via C410.

3-3-2 Vertical Section

1. Vertical sync goes into pin 14 through R317.
2. The free running frequency is determined by R301 and C301.

3-3-3 Vertical O/P section

1. The differential output currents from pin 13 of Vout1 and pin 12 of Vout2 can be directly coupled to the
vertical deflection booster pin 1 and pin 2 of TDA4863 AJ.
2. The TDA4863 AJ has two output stages which are current driven in opposite phase and operate in
combination with the deflection coil in a full bridge configuration.
3. This IC is powered by two sets of positive voltage and one set of negative voltage. (+12V at pin 1, -12V
at pin 4).

3-3-4 E-W/Trapezoid and H. Width Controls

1. The horizontal O/P stage uses diode modulator D419, C411, C412, L409 and C418 for East-West
(Pincushion) Trapezoid and H. width controls.
2. The scan current is determined by B+minus Vm ( the voltage of C418) values and the pincushion control is
accomplished by OPAMP(KA324) I402 and Q419 by coupling a parabola waveform from pin 11 of
TDA4841. The H. width / corner and trapezoid correction are also accomplished by this pin 11. The DC
level controls H. size. The AC level is combined with side pin and trapezoid corners functions.

3-3-5 X-Ray Protection

1. To avoid X-ray hazard, a DC voltage generated at pin 5 of FBT and rectified by D410, C424 and divided
by R404, R406 and R405 come into pin 2 of TDA4841.
2. If this voltage is higher than 6.39 V, then TDA4841 will be activated to float HUNLOCK (pin17), H.
DRV( pin 8), B DRV (pin 6), VOUT1 (pin 12), VOUT2 (pin13). After that all deflection circuit stop
working.

3-3-6 G1, Blanking and Brightness

1. The vertical blanking signal comes from unlock pin 17 of I401. This positive vertical pulses through Q405
amplified and converted into negative pulse and sent to G1 for vertical blanking.
2. In protection mode or an out-of- range situation HUNLock will send 5 V pulse to CPU pin 30 of I701,
then G1 will go down to -150V. During the mode change, Mute acts as same as HUNLock’s.

3-3-7 Contrast Section

1. Contrast is controlled by I701 through I2 C bus to I501 (LM1237) directly.
2. Beam current is detected through T402 (FBT) pin 7, C429, R449 and detected voltage feeding into pin 12
of I403 (KA324), R459, R548, C556 to control I501 pin 22 voltage. When I501 pin 22 voltage drops

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below 4.0 V, the ABL function will happen.

3-3-8 H/V size breathing compensation

1. Beam current is sensed as above section (3-3-7 item 2) and this voltage routes through R451, R468, C470
then through R437 to pin 31 of I401 for H. size compensation.
2. HV voltage is detected through T402(FBT) pin 11. C481, R4F4, R4F8, C430, R411, pin 5, 6, 7 of I403
(KA324) then through R302 to I401 pin 21 for V. size compensation.

3-3-9 Dynamic focus circuitry

The dynamic focus is applied to improve the corner focus performance, it includes horizontal and vertical
dynamicfocus.
1. Horizontal dynamic comes from Idy current through T403, R434, C448, R428 and feed to FBT dynamic
focus pin (T401 pin 12).
2. Vertical dynamic comes from pin 32 of I401 through C315, R309, R326, R322, R323, Q301, R324, R325
and feed to FBT dynamic focus pin.

3-4 Power Supply Section

3-4-1 AC Rectifier
The circuit can accept 90 V to 264 V AC input through D801~D803 bridge diodes and C808 filtering to get
DC 126 V~364 V for power conversion in T802.

3-4-2 Line Filter

It consists of C803, T801, C804, C805, C808, C819, C807, C817 and meets EMI regulation.

3-4-3 Power LED Status

1. The LED has 3 leads with common cathode to emit green and amber color light for different power
saving states. It is controlled by CPU.
2. Normal : Green light
Amber LED is off because CPU pin 29 is 1.96V and pin 24 is 0.45V, only green LED is turned on.
3. Off Mode : Amber light
CPU pin 24 is 1.87V and pin 29 is 0.46V, then green is off and amber is illuminated.

3-4-4 Auto Degaussing

When S801 turns on, pin 27 of I701 will send a signal to Q802 and turns on RL801 for degaussing. After 4
seconds, it will turn off RL801 automatically.

3-4-5 PWM Control

1. Start Up
The I801 (5S0765C) gets power from R807, R808, C830 and pin 3 voltage reaches 15 V for starting up.
The I801 starts oscillation at 20 kHz, pin 1 output to drive T802. Switching on, R819 set up an 15 V to
keep I801 working through D809 auxiliary voltage.

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2. Regulation
The DC O/P voltage is proportional to the auxiliary voltage, so I801 pin 4 senses the feedback voltage
from the divider D806, R809, C810, VR801, Q803, Q801 and R821 to compare with the built-in 1.5 volts
reference voltage for error amplifier operation. Finally pin 6 can modulate the different duty cycle by
VR801 setting to achieve regulation purpose.

3-4-6 Synchronization
1. Normal Mode
The sync pulse from FBT (31 kHz~69 kHz) via R812, R811 and C815 to pin 5 of I801 to keep I801
synchronized with horizontal sync input frequency.
2. Power Saving Modes: Standby/Suspend
Because there is no pulse from FBT, so the free-run frequency SMPS works at 20 kHz by I801 itself.
3. Override
The horizontal free run frequency is about 63.2 kHz under override condition, SMPS is synchronized to
this frequency.

3-4-7 O.V.P.
If the auxiliary voltage is higher than 25 volts makes pin 3 of I801 is limited to have the OVP activated.

3-4-8 O.P.P.
The excess current of T802 through I801 pin 1, 2, make Vs>1.1V internal of I801, then limite the power.

3-4-9 Step Up Power Supply For FBT

1. The B+ of FBT is proportional to horizontal frequency, that is the higher frequency, the higher voltage.
The basic voltage is 58 volts from T802 pin 10 via L811, D813, C824 and the gate control of Q451 comes
from I401 pin 6 via Q450, Q434, Q435 and R4E5. The duty cycle is controlled by I701 pin 23 (PWM pin
Adj.) via R719, C741, R4F6, R4F5, R4F1.
2. The regulation and boost up (from 68 V to 160 V or more, on demand). The H.V. is set at 25 kV (zero
beam) by I701 pin 23 which senses the secondary O/P from FBT. The booster comprises Q451, L410,
L411, D450, C425 and T802 to offer the required B+ for different frequency modes.

3-5 Video Amplifier Section and OSD (On Screen Display) function
1. RGB signal inputs are terminated by R501, R531 and R561 then pass through the coupling capacitors
C503, C533 and C563 to IC501 LM1237 preamplifier.
2. The amplifier RGB signals (0~3 Vpp) are adjusted by I2 C bus, I501 pin 23 is for clamp pulse which comes
from pin 16 of TDA4841 to set up equal clamp level.
3. The pre-amp video stage is amplified by I501 (LM1237/NT6812), it’s including OSD function and control
by I701 pin 12, 13 (I2 C).
4. The video output stage 15 is amplified by I502 (LM2469/LM2466).
5. The RGB cathodes cut off are adjusted by I503 (LM2480) pin 8, 7, 6, which comes from I501 pin 16, 15,
14 to adjust cut iff voltage level by I2 C bus.
6. Under override condition, “NO SIGNAL” will show up on the screen.

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4 Alignments and Adjustments

This section of the service manual explains how to make permanent adjustments to the monitor settings.

4-1 General Adjustments

4-1-1 Adjustment Conditions

a) Power Supply
Apply AC 115 V or 220 V
b) Warm-up Time
The monitor must be powered on for 15 minutes before starting any alignment, but requires 30 minutes of
warm-up time for convergence adjustment.
c) SignalInput
1. Video: RGB Analog, 0.7 Vp-p, positive
2. Synchronization: Horizontal and vertical TTL signal, separate, positive or negative
3. All adjustments should be made using a signal of FH = 68.68 kHz, FV = 85 Hz, unless otherwise
defined.

4-1-2 Equipment Required

The following equipments are necessary for adjustment procedures:
1. Volt-ohm-A meter (Sanwa FD-750C or equivalent)
2. 30 kV high voltage probe (HP34111A)
3. Oscilloscope (TEK2235 or equivalent)
4. Minolta Color Analyzer II
5. Signal generator (IBM PC with proper display cards or Chroma 2000)
6. Screwdriver

4-1-3 Switching Power Supply and Regulator Adjustment

a. The regulated B+ control has been preset in the factory and needs no adjustment. However, if any repair
is made on the power supply section, the following readjustment procedures are recommended:
1. Allow the monitor to warm-up for about 15 minutes.
2. Apply VGA (1024 x 768 @ 68.68 kHz/85 Hz) signal to the monitor.
3. Connect a DC voltage meter to TP001 (on the Main board), and adjust VR801 for 11.6 ± 0.1 Vdc
4. If a fuse is broken during adjustment, remember to replace it with the exact same type of fuse.
b. If necessary, follow the following procedures to enter the factory mode.
1. Press both 1 key and 2 key simultaneously then power ON.
2. After turn the power off, this monitor will go back to normal mode.

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4-2 Alignment Procedures

4-2-1 High Voltage Adjustment

CONDITION
Press 1 and 2 buttons simultaneously when switching the power “On”.
Display image : No video (68.68kHz Mode)
PROCEDURE
Connect DC meter to TP002 and adjust HV (i)
R802 to obtain a DC voltage of -173.5 ± 0.2 V DC (Sampo FBT) or -172.5 ± 0.2V DC (LCE FBT) for CPT
CRT M41AGE93X46 (TCO) or M41AGE83X46 (MPRII) .

4-2-2 Screen and White Balance Adjustment

CONDITION
Press 1 and 2 buttons simultaneously when switching the power “On”.
Display image : No video (68.68kHZ Mode)
PROCEDURE
1 Raster color setting
1-a. Set Brightness max. to 77, G1 to 60 (OSD cursor) and 530 ± 5 at G2, cursor.
1-b Adjust R and B cutoff to min.
1-c Adjust G cutoff to about 0.45FL
1-d Adjust B cutoff to get y=298 ± 5, R cutoff to get x=283 ± 5 and Y=0.65 ± 0.05 FL.
1-e Adjust Brightness cutoff to raster 0.01-0.02 FL.

CONDITION
Display image : 50 mm x 50 mm white block pattern
PROCEDURE
1 5500 0 K color temperature setting
1-a. Set Brightness to cutoff and Contrast to maximum.
1-b Move cursor on OSD to choose color temperature icon.
1-c. With green block pattern, adjust G gain to get Y about 32FL.
1-d Adjust R.B. gain to get x=333 ± 5, y=348 ± 5; and Y=40 ± 0.5FL
2 6500 0 K color temperature setting
2-a. Set Brightness to cutoff and Contrast to maximum.
2-b Move cursor on OSD to choose color temperature icon.
2-c. With green block pattern, adjust G gain to get Y about 32FL.
2-d Adjust R.B. gain to get x=313 ± 5, y=329 ± 5; and Y=43 ± 0.5FL
3 9300 0 K color temperature setting
3-a. Set Brightness to cutoff and Contrast to maximum.
3-b Move cursor on OSD to choose color temperature icon.
3-c. With green block pattern, adjust G gain to get Y about 32FL.

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 HP S7500/MV7500/CV7500

3-d Adjust R.B. gain to get x=283±5, y=297±5; and Y=46±0.5FL

4 Full white ABL setting

CONDITION
Display image : full white pattern
4-a Set Brightness to cutoff and Contrast to maximum.
4-b. Adjust ABL to Y=31FL ± 0.5FL.
4-c. Check the white balance at 5FL and 28FL.
4-d. Repeat all the procedures in 4-2-2 section until the best white balance is obtained.

4-2-3 Focus Adjustment

CONDITION
Display image : “me” character pattern (68.68 kHz Mode)
PROCEDURE
1. Set Brightness to cutoff and Contrast to maximum.
2. Adjust focus 1 at T402 (static focus VR) to make vertical line clear.
3. Adjust focus 2 at T402 (static focus VR) to make horizontal line clear.
4. Repeat above procedures to get best focus.

4-2-4 Static Convergence Adjustments

Static convergence involves alignment of the red, blue and green lines in the center area of the display.
Note : The monitor requires 30 minutes of warm-up time for convergence adjustment.
CONDITION
Display image : Crosshatch pattern
Warm-up Time : 30 minutes
PROCEDURE
1. Set brightness and contrast to display a well-defined pattern.
2. Ensure the convergence magnet rings are correctly positioned on the CRT.
Figure 4-1. Convergence Magnets on the CRT

11

+
CRT
P

FRONT

9 8 76 5 4 3 2
10

1) Setup Bolt 2) Bow Magnet 3) Band 4) 2-Pole Magnet

5) Spacer 6) 4-Pole Magnet 7) Spacer 8) 6-Pole Magnet
9) Holder 10) Band 11) Tabs

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 HP S7500/MV7500/CV7500

3. Rotate the individual rings of 4-pole convergence magnets by changing the spacing between the 2 tabs to
converge the vertical red and blue lines at the center of the screen.
4. Rotate the pair of rings of 4-pole convergence magnets by maintaining spacing between the 2 tabs to
converge the horizontal red and blue lines at the center of the screen.
5. Rotate the individual rings of 6-pole convergence magnets by changing the spacing between the 2 tabs to
converge the vertical red, blue and green lines.
6. Rotate the pair of rings of 6-pole convergence magnets by maintaining spacing between the 2 tabs to
converge the horizontal red, blue and green lines.
7. Repeat the steps from 3~6 until the best convergence is obtained.

Figure 4-2. 4-pole and 6-pole Magnets Movement

Red/
Blue Red Blue Green

Red/
Blue Blue

Red Green

4-pole magnets 6-pole magnets

movement movement

Note : The 4-pole magnets and the 6-pole magnets interact, making dot movement complex.

4-2-5 Degaussing
Degaussing is required when poor color impurity appears on the screen. This monitor uses an automatic
degaussing circuit that is activated when the power is on. The automatic degaussing will be fully functional
again after the monitor has been in operation for 20 minutes.
The degaussing effect is confined to the picture tube since the coils are mounted at the back of the tube.
Should any part of the chassis or cabinet becomes magnetized, it is necessary to degauss the affected area
with a manual degaussing coil.

4-2-6 Manual Degaussing

1. Apply line voltage to the degaussing coil and move it in a rotary motion over the front, sides, and top of the
monitor. The coil should be kept away from the rear of the monitor to avoid damaging the magnetic neck
components.
2. Slowly rotate and move the coil away from the monitor to about 6 feet beyond the point where no effect
on the CRT will be noticeable.
For proper degaussing, it is essential that the field be gradually reduced by moving the coil slowly away from
the monitor. The degaussing coil must never be shut off or disconnected while near the monitor, as this would
introduce a strong field instead of canceling the effect of the stray fields.

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 HP S7500/MV7500/CV7500

5 Troubleshooting

5-1 No Raster

No Raster

Measure
voltage of B+ at
T402 pin 2 on
PWB-MAIN

Normal High
0V (68 V, 31.5 kHz) (75 V or more)

Check voltage of Check I401,

cathode, heater, I703, R719, C741,
Short Circuit Grid 1, Grid 2, etc. R4F6, R4F5, R4C4
at load?

Yes

No

Check DC
Check voltage
B+ line, Q451,
of C808
Q402, T402

No
Yes

Check
Check D801,
I801, R807,
D802, D803,
R808, Q801,
D804, T801,
Q802, ZD802,
R804, F801
VR801

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 HP S7500/MV7500/CV7500

5-2 OSD Abnormal

OSD Abnormal

Check I502 pin 9, 4

Put on
is 5V and pin 5, 10, 7, Yes
I502
8 missing?

No

Check R517, L514,

R527, R523, R524 No Replace them
OK?

Yes

Check P502 No Replace it

OK?

Yes

Replace I502

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 HP S7500/MV7500/CV7500

5-3 Function Key Abnormal

Function Key Abnormal

Check I701 and Put on

Yes
I703 missing? I701, I703

No

Power
ON/OFF again and
No Replace X701
check X701, oscillator
OK?

Yes

Check
Replace I703 or do
I703 EEPROM content No
ATE again
OK?

Yes

Replace I701 and check

Yes Replace I701
uP OK?

No

Check
Check
pin 5 of I701 Yes
R775, R735
is 5V?

No

Replace I705, D703

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 HP S7500/MV7500/CV7500

5-4 No Vertical Scan (Raster is one horizontal line)

No Vertical Scan

Check I301 voltage of

Ckeck or replace
pin 1 is 12V, pin 4 is No
I301.
-12V

Yes

Check
Check R312, R307,
pin 5 O/P waveform at No
R306, R313
I301

Yes

Check
pin 6, 7 of I301 No Replace I401
waveform

Still no vertical scan

Check or replace CRT

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 HP S7500/MV7500/CV7500

5-5 Out of Horizontal Synchronization

Out of Horizontal
Synchronization

Check or replace
Horizontal the signal cable or
sync present at No H. sync pin 41
pin 15 of I401 of I701.

Yes

Check
I401 pin 8 H. output Check or replace
No
frequency & pin 29 I401, C406
waveform

Yes

Check Q401,
T401, Q402,
R424, D401

5-6 Out of Vertical Synchronization

Out of Vorizontal
Synchronization

Check signal
Vorizontal cable & V. sync
sync present at No pin 42
pin 14 of I401 of I701.

Yes

Check Check or replace

No
I401 pin 24 waveform I401,

Yes

Check I401 pin 13 & pin

14.

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 HP S7500/MV7500/CV7500

5-7 R.G.B. Video Amplifier Abnormal

RGB Video AMP Abnormal

Check Check or replace the

waveform at I501 pin 5, 6 No
signal cable or I501
and 7

Yes

Check
I502 pin 1, 2 and 3 collector
No Check I901
voltage (normally about
70V) & waveform

Yes

Video signal present at the

pin of the CRT R.G.B.
Cathode

Yes

Defective cut-off circuit

(DC restore) I503

5-8 Blank EEPROM Trouble-shooting:

Description of functions for models under E1770 series EEPROM DATA AUTO-RELOAD
The function allows plant staff to pre-write and customer service personnel to use blank EEPROM
through the pre-write EEPROM function whenever the CPU is implemented. The method of operation
is as follows:
First, start after HP S7500/MV7500/CV7500 turns to (<&>) KEY. At this point of time, the CPU is capable
of detecting the first 8 DATA of each page that EEPROM contains. When the reading goes to 00H or FFH,
the EEPROM PAGE will turn to blank; instead, the pre-set value is being written into the EEPROM through
CPU. Otherwise, it shall be deemed an effective value and that the pre-write function shall not be activated.
Note: The pre-write operation is only used in the service operation, if the EEPROM becomes faulty, we
need to replace it with a new one, but, to enable the adjustment ( geometry, color temperature, .. etc ) we
have to put in some " factory preset values " so that we can have a good start point, this is what we call "
pre-write " operation.

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 HP S7500/MV7500/CV7500

6 Recommended Parts List

Note:1. The components identified by “ “ mark are critical for X-ray safety. Replace these with
exactly the same parts specified.
2. There is only OTP IC at the model beginning (FPR stage or before). When it put in mass
production and there must be Mask coming out. If you have spart parts need, please use BOM
to get the last release part number and related information.

No. Location Part Number Description

1 Q401 6421002705 TR NPN KSD1616A G TA

2 C808 6312615109 ALU uF 150 400V F 85C 25x35

D801 D802
3 6412025607 DIODE LT2A06 T52 2A/800V
D803 D804

6412020022 (S0)
4 D814 DIODE FE30-02BXF06
6412021702 (S1)

5 D810 6412004117 DIODE UF2004M 2A/200V 50 nS

6 D815 6412002617 DIODE UF3002M 3A/100V 50 nS

7 D817 6412024404 DIODE HER106 1A/600V 50 nS

8 F801 6851504053 FUSE TIME LAG H-BRK 4A/250V

9 I301 6442026401 IC TDA4863AJ 7P (PHILIPS)

10 I401 6442030000 IC TDA4841 32P SDIP (PHILIPS)

11 I501 6442031503 IC LM1237 24P SDIP (NS)

12 I502 6442034900 IC LM2466 9P NS

13 I503 6442029901 IC LM2480 8P NS

14 I701 6448017800(OTP) IC NT6865 42P PDIP NOVA

15 I703 6448015730 IC MTV24C08 (ATC)

16 I705 6442000875 IC KIA78L05 (SAMSUNG)

17 I801 6442031600 IC 5S 0765C 5P FAIRCH

18 L404 6111274130 COIL CHOKE 2.7mH K DR8x10

19 L405 6119008400 COIL LINEAR

20 L409 6111155133 COIL CHOKE 150uH DRWW 14x15 LY3B

21 L410 6111155138 COIL CHOKR L=150uH K DRWW 14x15

22 Q402 6421004900 TR NPN 2SC5387

23 Q405 6422002925 TR NPN HBF422T/B TO-92 TAPING

Page 24
 HP S7500/MV7500/CV7500

No. Location Part Number Description

24 Q419 6422006000 TR NPN 2SD2012 TO-220(IS)

Q420 Q421 6426010510 (S0)

25 FET N-CHNL IRF630MFP/IRFS630A
Q430 6426010500 (S1)

26 Q451 6426006300 FET N-CHNL IRFS634A FAIRCH 11d

27 R803 6203080022 POSISTOR & OHM DGC2D8ROM

28 R804 6201100012 THERMISTOR 10 OHM 3A P=5 UEI

29 R802 R803 6221127852 MOF OHM 0.27 1W J HOR

30 T401 6135000801 XFRMER HOR DRIVE THD-1008A EI19

6133070230 FBT TFB-7023 FEA9 SAMPO (S1)

31 T402
6133070240 FBT TFB-7024 CF2001 LIEN CHANG (S0)

32 T403 6136001800 XFRMER DYNAMIC TDF-1018 EI19LSE

33 T801 6138001603 LINE FILTER TLF-1016C 16mH LSE

6131042221 XFRMER PWR TPW-1084A ERL35 LSE (S0)

34 T802
6131042231 XFRMER PWR TPW-1084A ERL35 HJC (S1)

6449006900 (S1)
35 X701 CRYSTAL 12.000 MHZ 49U 30PF TOP
6449006910 (S0)

Page 25
 HP S7500/MV7500/CV7500

7 Block Diagram

R DAC
P501 R
G DAC
B DAC G
RG
R R B
R

G1
LM2480
GG R, G, B
G I502
G I501 BUFFER
G Video AMP
BG SDA PRE AMP & LM2469
SCL LM1237 DC
B LM2466
B B RESTORE
5V

ABL
SW 5 V 80V 11.6V

SCL
SDA

VIDEO 5 V
SW5 V
CLBL

VTTL
11.6V

HFLB
ABL

SCL1
SDA1
GND
6.3V
GND
GND

GND

GND
80V

G1
P503
P502
H
V
5V

SG BLANKING
BRIGHTNESS
CKT
SDA CONTROL &
SPOT KILLER 25.6KV
SCL HFLB
O/R
O/R
V H H
H DRIVER OUT
SDA 1 -150V
SDA
SCL 650V
SCL 1 FBT
LED 6.6KV
MODULATE
V
TDA4841

R432
NT6865

DIODE
I701

I401

KEY H
CONTROL
S702

STEP
UP
CKT
POWER TDA4863J
DEL +H
VERTICAL
CKT BRIGHTNESS -H
O/P
I301 +V D.Y
I705
5V -V
78L05

E2 PROM DEG
I703 CKT XRP
Rotation
Q820
Q811
-12V

11.7V 5V
Q510

POWER
O/P 7V
Q811
TRANS
LINE BRIDGE 5S0765C T802
FILTER DIODE I801
SMPS 80V

LOW VOLTAGE 600V

dynamic
DROP DOWN Vertical Focus foucus

Page 26
LITE-ON TECHNOLOGY CORP.
5 F, No. 16, Sec. 4, Nanking E. Road, Taipei, Taiwan
Tel:886-2-25706999 Fax:886-2-25706888
URL:// www.liteontc.com.tw Printed in Taiwan