Service Manual

17 Inch (Viewable size 17.0 )

TFT LCD Analogue Color Monitor

H750D(B17CF)
 Contents

1. Precautions
Safety Precautions 4
Servicing Precautions 6
Electrostatically Sensitive Devices (ESD) Precautions 7

2. Product Specifications
Specifications 8
Pin Assignment Table D-Sub 15 Pin Connector 9
Timing Chart 9
Dimensions 10

3. Disassembly and Reassembly

11

4. Troubleshooting
14

5. Exploded View & Parts List

17

6. Packing & Unpacking

19

7. Electrical Parts List

Main Board 20

2 Service Manual
 Contents

8. Block Diagram

CONTENTS
22

9. Wiring diagram
23

10. PCB Layout

Main PCB 24
Key PCB 25
Semiconductor Aead Identification 27

11. Schematic Diagram

28

Copyright

2003 by Hansol Electronics Inc.

All rights reserved.

This manual may not, in whole or in part, be copied,

photocopied, reproduced, translated, or converted to any
electronic or machine readable form without prior written
permission of Hansol
Electronics Inc.

Hansol H750D(B17CF) Service Manual

First editior July 2003

Service Manual 3
 Precautions

1. Precautions

Follow these safety, servicing and ESD precautions to prevent damage and to protect against
potential hazards such as electrical shock.

1-1 Safety Precautions

1-1-1 Warnings

1. For continued safety, do not attempt to modify the circuit board.

2. Disconnect the AC power ,Signal cable and Stereo cable before servicing.

1-1-2 Servicing the LCD Monitor

1. When servicing the LCD Monitor Disconnect the AC power cord from the AC outlet.

2. It is essential that service technicians have an accurate voltage meter available at all times.
Check the calibration of this meter periodically.

1-1-3 Fire and Shock Hazard

Before returning the monitor to the user,perform the following safety checks :

1. Inspect each lead dress to make certain that the leads are not pinched or that hardware is not
lodged between the chassis and other metal parts in the monitor.

2. Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet
backs, adjustment and compartment covers or shields, isolation resistor-capacitor networks,
mechanical insulators, etc.

3. To be sure that no shock hazard exists, check for leakage current in the following manner.
Warning : Do not use an isolation transformer during this test.

a. Plug the AC line cord directly into a 120 Volt AC outlet.

b. Unisg two clip leads, connect 1.5 , 10 watt resistor paralleled by a 0.15 capacitor in series
with an exposed metal cabinet part and a known earth ground, such as an electrical conduit or
electrical ground connected to an earth ground.

4 Service Manual
 Precautions

c. Use a SSVM or VOM with 1000 ohms per-volt or higher sensitivity to measure the AC voltage
drop across the resistor (see Figure 1-1).

PRECAUTION
d. Connect the resistor to an exposed metal part having a return path to the chassis(metal cabinet,
screw heads, knobs, shafts, escutcheon, etc.) and measure the AC voltage drop across the
resistor.

e. Any reading of 5.25 Volt RMS ( this corresponds to 3.5 milliampere AC ) or more is excessive
and indicates a potential shock hazard. Correct the shock hazard before returning the monitor to
the user.

AC Voltmter

Test Probe
1500

0.15

To Exposed To Known
Metal Parts Earth Ground Figure 1-1.
Leakage Current Test Circut

1-1-4 Product Safety Notices

Some electrical and mechanical parts have special safety-related characteristics which are often not
evident from visual inspection. The protection they give may not be obtained by replacement that
does not have the same safety characteristics as the recommended replacement part may create
shock, fire and /or other hazards. Product safety is under review continuously and new instructions
are issued whenever appropriate.

Service Manual 5
 Precautions

1-2 Servicing Precautions

WARNING : An electrolytic capacitor installed with the wrong polarity might explode.

Caution : Before servicing instruments covered by this service manual and its supplements,
read and follow the Safety Precautions section of this manual.

Note : If unforeseen circumstances create conflict between the following servicing preautions
and any of the safety precautions, always follow the safety precautions.

1-2-1. General Servicing Precautions

1. Servicing precautions are printed on the cabinet, and should be followed closely.

2. Always unplug the unit's AC power cord from the AC power source before attempting to :
(a) remove or reinstall any component or assembly, (b) disconnect PCB plugs or connectors,
(c) connect a test component in paralled with an electrolytic capacitor.

3. Some components are raised above the printed circuit board for safety. An insulation tube or tape
is sometimes used. The internal wiring is sometimes clamped to prevent contact with thermally hot
components. Reinstall all such elements to their original position.

4. After servicing, always check that the screws, components and wiring have been correctly
reinstalled. Make sure that the portion around the serviced part has not been damaged.

5. Check the insulation between the blades of the AC plug and accessible conductive parts
(examples; metal panels, input terminals and earphone jacks)

6. Insulation Checking Procedure : Disconnect the power cord from the AC source and turn the power
switch ON. Connect an insulation resistance meter(500V) to the blades of the AC plug.
The insulation resistance between each blade of the AC plug and accessible conductive parts
(see above) should be greater than 1 megohm.

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.

6 Service Manual
 Precautions

1-3 Electrostatically Sensitive Devices(ESD) Precautions

PRECAUTIONS
Some semiconductor (solid state) devices can be easily damaged by static electricity. such
components are commonly called Electrostatically Sensitive Devices(ESD). Examples of typical ESD
devices are integrated circuits and some field-effect transistors. The following techniques will reduce
the incidence of component damage caused by static electricity.

1. Immediately before handling any semiconductor components or assemblies, drain the electrostatic
charge from your body by touching a known earth ground. Alternatively, wear a discharging
wrist strap device. To avoid a shock hazard, be sure to remove the wrist strap before applying
power to the monitor.

2. After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil
to prevent accumulation of an electrostatic charge.

3. Do not use freon-propelled chemicals. These can generate electrical charges Sufficient to damage
ESDs.

4. Use only a ground-tip soldering iron to solder ESDs.

5. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-
static" can generate electrical charges sufficient to damage ESDs.

6. Do not remove a replacement ESD from its protective package until you are ready to install it. Most
relacement ESDs are packaged with leads that are electrically shorted together by conductive
foam, aluminum foid or other conductive materials.

7. Immediately before removing the protective material from the leads of a replacement ESD, touch
the protective material to the chassis or circuit assembly into which the device will be installed.

Caution : Be sure no power is applied to the chassis or circuit and observe all other safety
precautions.

8. Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing
clothes together, or lifting your font from a carpeted floor can generate enough static electricity to
damage an ESD.

Service Manual 7
 Precautions

2. Product Specifications
2-1 Specifications

Model H750D(B17CF)
Type Amorphous Active Matrix Super TFT LCD
Screen Size 337.9(H) X 270.3(V) mm (17 inch diagonal)
Maximum Resolution 1280 X 1024 @ 75Hz
Pixel Range 0.264mm X 0.264mm
LCD PANEL Display Colors 8 bit data =16.7 million colours
Contrast Rate 350 : 1
Viewing Angle 70°/70°/60°/60°( up /down /left / right)
Response Speed 25ms
Brightness 250 cd/m2

Synchornization Horizontal Frequency 60KHz( Max )

Vertical Frequency 75HZ( Max )
Video Signal Analog RGB (0.714Vpp) 75 ohm
Video Input
Synchronous Signal Mode LVDS (8bit) 3 sync signal, Clock
Maximum 45W
Power
Consumption Soft Power off Under 1W

Control Keys Front part Source,MENU/MUTE,AUTO/SELECT,Power,

Brightness/-,Contrast/+,VOL/Mute

Input Power 100 / 240V(50~60Hz)

Wall Mount VESA Standard

Safety Standard UL,CE,CB,TUV

EMI FCC,RRL
Safety & EMI
Low Radiation MPR-II

Dimension Size and Weight 380 X 176 X 368 / 5.8Kg

8 Service Manual
 Product Specifications

2-2 Pin Assignment

PRODUCT SPECIFICATIONS
The 15-pin D-sub connector(male) of the Analog signal cable

Pin No. Assignment Pin No. Assignment 1 5

1 Red Video 9 5V Input
2 Green Video 10 ST_DET
3 Blue Video 11 Ground
4 F Ground 12 SDA 6 10
5 N.C 13 H.Sync
6 Red Video Ground 14 V.Sync
7 Green Video Ground 15 SCL 11 15
8 Blue Video Ground

The 24 pin DVI-D cable Pin Connection

Pin Signal Pin Signal Pin Signal

1 8 D1
D2

D4
17 24 D3

2-3 Timing chart

This section of the service manual describes the timing that the computer industry recognizes as
standard for computer-generated video signals.

No. Display Mode Hor. Freq (kHz) Ver. Freq (Hz) Dot Clock (MHz)
1 VGA (720 X 400) 31.469 70.087 28.322
2 VGA (640 X 480) 31.469 59.940 25.175
3 VGA (640 X 480) 37.500 75.000 31.500
4 SVGA (800 X 600) 37.900 60.320 40.000
5 SVGA (800 X 600) 46.875 75.000 49.500
6 XGA (1024 X 768) 48.363 60.004 65.000
7 XGA (1024 X 768) 60.023 75.029 78.750
8 SXGA (1280 X 1024) 63.981 60.020 108.000
9 SXGA (1280 X 1024) 79.976 75.025 135.000
10 MAC (640 X 480) 35.000 66.667 30.240
11 MAC (832 X 624) 49.726 74.551 57.284
12 MAC (1152 X 870) 68.681 75.062 100.000

Service Manual 9
 Product Specifications

2-4 Dimensions

FRONT VIEW SIDE VIEW

380
437.2
366

REAR VIEW

10 Service Manual
 Disassembly and Reassembly

3. Disassembly and Reassembly

DISASSEMBLY AND REASSEMBLY

The section of the service manual describes the disassembly and reassembly procedure for
the H750D(B17CF) Monitor.
WARNING : This has to be disassembled and reassembled carefully because TFT-LCD Panel
is weak for impact. This monitor contains electrostatically sensitive devices.
Use caution when handling these components.

3-1 Disassembly

Cautions : 1. Disconnected the monitor from the power source before disassembly.
2. Follow these directions carefully; never use metal instruments to pry apart the cabinet.

3-1-1 Separation between display part and stand part

1. Disconnected the Monitor from the power Cord before disassembly
2. Disconnected the monitor from Signal Source Cable.
3. Remove the 4 screws on the Stand.
4. Try it off the back Stand of the monitor.

3-1-2 The Display part Disassembly

The Rear housing Removal
1.Unscrew the 2 point screws on the rear corner of the Rear Cover.
2. Disconnect Inverter wire.
3. Unscrew the 2 point screws on the Rear shield Cover and remove the Rear shield cover.
4. Disconnect Inverter wire and Combo cable from combo board.
5. Unscrew the 4point screws on the Combo PCB and the 1point screw of the FG wire.
6. Seperate the combo board.
7. Unscrew the 4point screws on the Main PCB and Remove the LVDS Cable.
8. Seperate the KEY cable and Speaker cable from Main PCB.
9. Seperate the Main PCB Assembly.
10. Seperate I/O Shield with Main board.
11. Seperate the Front Bezzel after unscrew the rear housing
12. Seperate the Rear housing after unscrew the 4point screws of the panel

3-1-3 Stand Disassembly

1. Remove 4 screws from the Stand Rear.
2. Remove Stand Head from the Stand assembly.
3. Remove 6 screws from the Stand Bottom.
4. Remove Stand Bottom from the Stand assembly.
5. Remove 2 screws from the Stand Bottom.
6. Remove Stand Base from the Stand assembly.

Service Manual 11
 Disassembly and Reassembly

Fiqure

12 Service Manual
 Disassembly and Reassembly

3-2 Reassembly

DISASSEMBLY AND REASSEMBLY

3-2-1 Display part Reassembly

Reassembly procedures are in the reverse order of Disassembly Procedures.

Confirm that insulation plate puts into on the left of the TFT-LCD
panel and main chassis.

3-2-2 Stand(Power Stand & Normal Stand) part Reassembly

Reassembly procedures are in the reverse order of Disassembly Procedures.

3-2-3 Display part and Stand part Reassembly

Reassembly reversely the Display part and Stand part disassembly method.

Service Manual 13
 Troubleshooting

4. Troubleshooting
4-1 Micom(WT61P4L44)
We can check the micom operation correctly by press the soft power switch.
When the chip does not operate in the normality, power indicating the LED is always extinguished.
In the normality, if the screen appear 'No Signal' or 'No Cable', the LED is green amber.
When the screen is displayed, the LED is green light.

4-2 When the LED operate in the abnormality

Check Check &

Diagram point Order Replace Item
Combo B/D
U2 Does appear DC 5V at pin 7 of U2 &
YES D21,22,23

U2 Does appear Clock pulse(12MHz) at pin 9,10 of U2 Y1

YES

U2 Does appear active low input at pin 25 of U2 U2

YES

U2 Does appear DC 5V at pin 5 of U2 U2

YES
Update the latest F/W of H750D and check the LED. Replace
Does it update in normality ,and operate the LED? Main PCB !
YES

It's fine !

4-3 When H750D is not displayed in abnormality.

4-3-1 When screen is just white !

Check Check &

Diagram point Order Replace Item
LVDS CABLE Check connection of LVDS CABLE.
Does appear white screen ? LVDS CABLE
YES
U6 Does appear DC 3.3V at pin 4 of U6 ? U6,U7 &
U7 Does appear DC 2.5V at pin 4 of U7 ? Related circuit
YES
U4 Dose proper Clock pulse(14.3MHz) at U4
122,123pin of U4
YES

J1 Dose appear active signal pin 10,11,22,23 of J1 U4

YES

Replace Panel !

14 Service Manual
 Troubleshooting

TROUBLESHOOTING
4-3-1 When screen is just black !

Check Check &

Diagram point Order Replace Item

LVDS Cable Check LVDS Cable is it ok? LVDS Cable

YES
INVERTER Check inverter lamp cable Is it OK? INVERTER
Lamp Cable Lamp cable
YES
J2 Does proper DC +5V COMBO &
appear at pin 2,3 of J2 Wire
YES

U2 Dose proper DC 5V appear at pin14,15 of U2 U2

YES

U5 Dose proper DC 5V appear at pin2 of U5 U5

YES

Replace Main PCB!

4-3-2 The monitor has the following dimensions:

with packaging w/o packaging

Width in mm 525 416

Height in mm 580 452

Depth in mm 300 216

Weight in kg 9.5 6.7

Service Manual 15
 Exploded View & Parts List

7. Exploded View & Parts List

16-E
16-D

16-C
16-B
16-A
15-D

15-C
15-B
15-A
14
13

H
JST
H
JST
1
2
1
2
12

11

10
9
8
7

6
5

1-C
1-B
3
2
1-A

Service Manual 16
 Exploded View & Parts List

NO. PART NAME CODE NO. DESCRIPTION Q’TY REMARKS

1 BEZEL FRONT ASS'Y 6526170001AD - 1
1-A BEZEL FRONT 6226170001AD ABS-HB,SD-0150,C7425, 1
SILVER_SPRAY(S33-740-A8912)
1-B COVER CONTROL 6226170013AD ABS-HB,SD-0150, 1
85289(DARK GREEN)
1-C KNOB CONTROL 6226170011AD ABS-HB,SD-0150,G71159,PMMA 1
2 SPEAKER 56410003AAAD NB-04301-15,1 X1 INCH, 2
8 OHM,350HZ,1.0W
3 T/T,SCREW 67613004AAAD BHB,+,3 8,.,. 4
4 17""TFT-LCD PANEL 5417L00814AD LTM170EU-L01,LVDS,8BIT,16.2M, 1
SXGA(1280*1024),4CCFL,75HZ
5 MACHINE,SCREW 68660001AAAD BH,M3 6 4
6 MAIN,CHASSIS,ASS'Y 6526170004AD H750,SECC,1.0T,AMLCD,HYDIS 1
7 ASS'Y, COMBO B'D 3322330002VD 17"",SMPS-12V/5V,48W, 1
INVERTER-6.5MARMS,IPT/BENTEK
8 T/T,SCREW 67613007AAAD BH,B-TYPE,+,M3X6 8
9 ASS'Y, PCB MAIN,DIP 0526171002AA TFT,B17CF(H750_AMLCD), 1
PCB MAIN,DIP
10 IO,SHIELD 6326170005AD SPTE,0.5T 1
11 SHIELD,COVER 6326170003AD SECC,1.0T 1
12 T/T,SCREW 67613007AAAD BH,B-TYPE,+,M3X6 2
13 HOUSING,REAR 6226170002AD ABS-HB,SD-0150,K2440 1
14 T/T,SCREW 67613012AAAD BHB,+,M4X 10,BLACK 2
15 STAND,BASE,ASS'Y 0926170001AD - 1
15-A RUBBER,FOOT 6222990001AD NR,15.2 ,1.3T,GRAY(423C) 3
15-B T/T SCREW 67213001AAAD FHB,+,3 8 5
15-C BOTTOM,PLATE 6326170007AD SECC,2.0T 1
15-D STAND,BASE 6226170010AD ABS-HB,SD-0150,K2440, 1
SILVER_SPRAY(S33-740-A8912)
16 STAND,NECK,ASS'Y 0926170002AD - 1
16-A STAND,FRONT 6226170004AD ABS-HB,SD-0150,K2440 1
16-B BODY,FRAME 6326170006AD SECC,2.0T 1
16-C T/T,SCREW 67613012AAAD BHB,+,M4X 10,BLACK 5
16-D HINGE,ASS'Y 6526170002AD ABS-HB,SD-0150,K2440 1
16-E STAND,BACK 6226170005AD ABS-HB,SD-0150,K2440 1

17 Service Manual
 Packing & Unpacking

6. Packing & Unpacking

PACKING & UNPACKING

No Description Specification Quantity Remarks

1 Tape-Masking OPP W75 CLR 1.2 Mt -
2 Carton Box B17CF 1EA CB DW-3
3 Set-Monitor B17CF 1Set EPS 60M C=0.018
4 Cushion-L/R B17CF 1Set 17" TFT Monitor
5 Gift Box B17CF 1EA Cable Etc.

Service Manual 19
 Electrical Parts List
Introduction

LOCATION No. PART NO. TYPE DESCRIPTION

20 Service Manual
 Electrical Parts List

ELECTRICAL PARTS LIST

LOCATION No. PART NO. TYPE DESCRIPTION

Service Manual 21
 Block Diagram

8. Block Diagram

22 Service Manual
 Wiring Diagram

9. Wiring diagram

WIRING
D IA G R A M

Service Manual 23
 PCB Layout

10. PCB Layout

10-1. Main PCB

10-1-1 TOP View

24 Service Manual
 PCB Layout

10-1-2 Bottom View

PCB LAYOUT
10-2. Key Control Board

10-2-1 TOP View

10-2-2 Bottom View

Service Manual 25
 PCB Layout

10-3. Semiconductor Lead Identification,

26 Service Manual
 PCB Layout

Semiconductor Lead Identification

10-3. Semiconductor Lead Identification,

Service Manual 27
 Schematic Diagrams Schematic Diagrams

11. Schematic Diagrams

11-1. VGA_INPUT LINE

Schematic Diagrams
27 Service Manual Service Manual 28
 Schematic Diagrams Schematic Diagrams

11-2. DVI INPUT LINE

Schematic Diagrams
29 Service Manual Service Manual 30
 Schematic Diagrams Schematic Diagrams

11-3. MCU

Schematic Diagrams
31 Service Manual Service Manual 32
 Schematic Diagrams Schematic Diagrams

11-4. SCALER

Schematic Diagrams
33 Service Manual Service Manual 34
 Schematic Diagrams Schematic Diagrams

11-5. POWER

Schematic Diagrams
35 Service Manual Service Manual 36
 Schematic Diagrams Schematic Diagrams

11-6. AUDIO

Schematic Diagrams
37 Service Manual Service Manual 38