Service Manual

Model #: VIZIO JV50P HDTV10A

V, Inc
320A Kalmus Drive Costa Mesa, CA 92626
TEL : +714-668-0588 FAX :+714-668-9099

Top Confidential
 Table of Contents

CONTENTS PAGE

Sections

1. Features 1-1

2. Specifications 2-1

3. On Screen Display 3-1

4. Factory Preset Timings 4-1

5. Pin Assignment 5-1

6. Main Board I/O Connections 6-1

7. Theory of Circuit Operation 7-1

8. Waveforms 8-1

9. Trouble Shooting 9-1

10. Block Diagram 10-1

11. Spare parts list 11-1

12. Complete Parts List 12-1

Appendix
1. Main Board Circuit Diagram

2. Main Board PCB Layout

3. Assembly Explosion Drawing

Block Diagram

VIZIO JV50P HDTV10A Service Manual

VINC Service Manual
VIZIO JV50P HDTV10A

COPYRIGHT © 2000 V, INC. ALL RIGHTS RESERVED.

IBM and IBM products are registered trademarks of International Business Machines
Corporation.

Macintosh and Power Macintosh are registered trademarks of Apple Computer, Inc.

VINC and VINC products are registered trademarks of V, Inc.

VESA, EDID, DPMS and DDC are registered trademarks of Video Electronics Standards
Association (VESA).

Energy Star is a registered trademark of the US Environmental Protection Agency (EPA).

No part of this document may be copied, reproduced or transmitted by any means for any
purpose without prior written permission from VINC.

FCC INFORMATION
This equipment has been tested and found to comply with the limits of a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates,
uses and can radiate radio frequency energy, and if not installed and used in accordance with
the instructions, may cause harmful interference to radio communications. However, there is
no guarantee that the interference will not occur in a particular installation. If this equipment
does cause unacceptable interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures -- reorient or relocate the receiving
antenna; increase the separation between equipment and receiver; or connect the into an
outlet on a circuit different from that to which the receiver is connected.

FCC WARNING
To assure continued FCC compliance, the user must use a grounded power supply cord and
the provided shielded video interface cable with bonded ferrite cores. Also, any unauthorized
changes or modifications to Amtrak products will void the user’s authority to operate this
device. Thus VINC Will not be held responsible for the product and its safety.

CE CERTIFICATION
This device complies with the requirements of the EEC directive 89/336/EEC with regard to
“Electromagnetic compatibility.”

SAFETY CAUTION
Use a power cable that is properly grounded. Always use the AC cords as follows – USA (UL);
Canada (CSA); Germany (VDE); Switzerland (SEV); Britain (BASEC/BS); Japan (Electric
Appliance Control Act); or an AC cord that meets the local safety standards.

VIZIO JV50P HDTV10A Service Manual

Chapter 1 Features

1. Built in TV channel selector for TV viewing

2. Simulatnueous display of PC and TV images
3. Connectable to PC’s analog RGB port
4. Built in HDTV, composite video, HDMI ,ATV out and DTV out ,
Audio AUX IN
5. Built in auto adjust function for automatic adjument of screen display
6. Smoothing function enables display of smooth texts and graphics even if
image with resolution lower than 1366x768 is magnified
7. Picture In Picture (PIP) function to show TV or VCR/DVD images
8. Power saving to reduce consumption power too less than 3W
9. On Screen Display: user can define display mode (i.e. color, brightness,
contrast, sharpness, backlight), sound setting, PIP, TV channel program,
aspect and gamma or reset all setting.
10. RF Modulation: Direct Sequence Spreading Spectrum (DSSS)
11. TX/RX distance: 10Meters (indoor with free space) min.
12. RX channel: 4 channels in 5.8GHz ISM band with auto scan and
synchronization functions.
13. Support 16bit, 32/44.1/48KHz digital audio transmission and receiving.
14. User unique ID pairing function.
15. RF channel Carrier Frequency:
Channel No. Center Frequency
1 5745MHz
2 5765MHz
3 5785MHz
4 5805MHz

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Chapter 2 Specification
1. PDP CHARACTERISTICS
PDP50X4 (50”WXGA PDP MODULE)
Item Specification
Active Screen Size 50 inch diagonal
Outline Dimension 1190(H) × 700(V) × 58(D) ± 1mm
Display Area 1106.5(H) × 622.1(V) ± 0.5mm
Pixel Pitch 810 ㎛(H) × 810 ㎛(V)
Cell Pitch 270 ㎛ (H) × 810 ㎛ (V) (Green Cell basis)
Pixel Format 1366(H) × 768(V) (1pixel=3 RGB cells)
Number of Gradations (R)1,024 × (G)1,024 × (B)1,024 colors
Peak Brightness Typical 1,500cd/㎡ (1/100 White Window pattern at
center)
Contrast Ratio Average 130:1 (In a bright room with 100Lux at center)
Typical 15,000:1 (In a dark room 1/100 White Window
pattern at center)
Viewing Angle(L/R/U/D) Free
Power Consumption Max. 400 W (Full-White)
Weight 20.4±0.5 Kg (Net 1EA)

2.Input Connectors
RJ11, D-SUB15PIN (MINI, 3rows), HDMIX3, RCAX2 (component), RCAX2 (AUDIO
in), RCAX2 (composite), RCAX2 (AUDIO in), Tuner, SPDIF IN(Optical Audio)

3.Output Connectors
Stereo RCA Jack (Analog audio out) , SPDIF Out (Optical Audio)

4. POWER SUPPLY
Power Consumption: 550W MAX
Power OFF: to less than 3W MAX
SUBWOOFER POWER SUPPLY
Power Consumption: 70W MAX
Sleep mode(or TV off): to less than 3W MAX

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5.Speaker
Output 10W (max) X3
Wireless Speaker :
(1) Rear Right 10W(max)
(2) Rear Left 10W(max)
(3) Subwoofer 20W(max)

6. ENVIRONMENT
7-1. Operating Temperature: 5c~35c (Ambient)
7-2. Operating Humidity: Ta= 35 °C, 90%RH (Non-condensing)
7-3. Operating Altitude: 0 - 14,000 feet (Non-Operating)

7. DIMENSIONS (Physical dimension)

Width: 1241.0mm
Height: 856.3mm
Depth: 291.2mm

8. WEIGHT (Physical weight)

a. TV net 52.6kg
b. Spk net 8.0kg
c. TV and spk gross 72.0kg

9.Please pay attention to the followings when you use this PDP module.
9-1. MOUNTING PRECAUTIONS
(1) You must mount a module using holes arranged in four corners or four sides.
(2) You should consider the mounting structure so that uneven force (ex. Twisted
stress) is not applied to the module. And the case on which a module is mounted
should have sufficient strength so that external force is not transmitted directly to
the module.
(3) Please attach the surface transparent protective plate to the surface in order to
protect the polarizer.
Transparent protective plate should have sufficient strength in order to the resist
external force.
(4) You should adopt radiation structure to satisfy the temperature specification.

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(5) Acetic acid type and chlorine type materials for the cover case are not desirable
because the former generates corrosive gas of attacking the polarizer at high
temperature and the latter causes circuit break by electro-chemical reaction.
(6) Do not touch, push or rub the exposed polarizes with glass, tweezers or
anything harder than HB pencil lead. And please do not rub with dust clothes
with chemical treatment.
Do not touch the surface of polarizer for bare hand or greasy cloth.(Some
cosmetics are detrimental to the polarizer.)
(7) When the surface becomes dusty, please wipe gently with absorbent cotton or
other soft materials like chamois soaks with petroleum benzene. Normal-hexane
is recommended for cleaning the adhesives used to attach front / rear polarizers.
Do not use acetone, toluene and alcohol because they cause chemical damage
to the polarizer.
(8) Wipe off saliva or water drops as soon as possible. Their long time contact with
polarizer causes deformations and color fading.
(9) Do not open the case because inside circuits do not have sufficient strength.

9-2. OPERATING PRECAUTIONS

(1) The spike noise causes the mis-operation of circuits. It should be lower than
following voltage :
V=±200mV(Over and under shoot voltage)
(2) Response time depends on the temperature. (In lower temperature, it becomes
longer.)
(3) Be careful for condensation at sudden temperature change. Condensation
makes damage to polarizer or electrical contacted parts. And after fading
condensation, smear or spot will occur.
(4) When fixed patterns are displayed for a long time, remnant image is likely to
occur.
(5) Module has high frequency circuits. System manufacturers shall do sufficient
suppression to the electromagnetic interference. Grounding and shielding
methods may be important to minimize the interference.

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9-3. HANDLING PRECAUTIONS FOR PROTECTION
(1) The protection film is attached to the bezel with a small masking tape. When the
protection film is peeled off, static electricity is generated between the film and
polarizer. This should be peeled off slowly and carefully by people who are
electrically grounded and with well ion-blown equipment or in such a condition,
etc.
(2) When the module with protection film attached is stored for a long time,
sometimes there remains a very small amount of glue still on the bezel after the
protection film is peeled off.
(3) You can remove the glue easily. When the glue remains on the bezel surface or
its vestige is recognized, please wipe them off with absorbent cotton waste or
other soft material like chamois soaked with normal-hexane.

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Chapter 3 On Screen Display

Main unit button

Power
MENU
CH ▲
CH ▼
VOL +
VOL -
Input

On Screen Display
TV Source
A. PICTURE：
a. PICTURE MODE
(CUSTOM/ STANDARD / MOVIE / GAME)
b. BACKLIGHT (0~100)
c. BRIGHTNESS (0~100)
d. CONTRAST (0~100)
e. COLOR (0~100)
f. TINT (-32~32)
g. SHARPNESS (0~100)
h. COLOR TEMPERATURE
(CUSTOM/COOL/NORMAL/WARM)
i. ADVANCED VIDEO
i-1. DNR(OFF/LOW/MEDIUM/STRONG)
i-2. BLACK LEVEL EXTENDER (ON/OFF)
i-3. WHITE PEAK LIMITATOR (ON/OFF)
i-4 CTI(OFF/LOW/MEDIUM/STRONG)
i-5 FLESH TONE (ON/OFF)
i-6 ADAPTIVE LUMA (ON/OFF)

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B. AUDIO：
a. VOLUME (0~100)
b. BASS (0~100)
c. TREBLE (0~100)
d. DCR( Off / 1/4 / 1/2 / 3/4 / Full )
e. SPEAKERS (ON/OFF)
f. Wireless SPEAKERS (ON/OFF)
g. SPDIF IN( Off / AV1 / AV2 / COMPONENT1 /COMPONENT2 / HDMI1 / HDMI2 / HDMI3 )
h. SPEAKER SETTING
h-1. SPEAKER LOCATION( Auto / Left / Center /Right / Rear Right / Sub Woofer / Rear Left )
h-2. TRIM
h-2-1. Left(0~100)
h-2-2. Right(0~100)
h-2-3. Rear Left(0~100)
h-2-4. Rear Right(0~100)
h-2-5. Center(0~100)
h-2-6. Sub Woofer(0~100)
h-3. SPEAKER DISTANCE SETUP
h-3-1. TV (0~15ft.)
h-3-2. Rear Left(0~15ft.)
h-3-2. Rear Right(0~15ft.)

C. TV：
a. TUNER MODE (ANTENNA/CABLE)
b. AUTO SEARCH (RUN)
c. SKIP CHANNEL (TABLE)
d. Digital Audio Out (Off / Dolby Digital / PCM)
e. TIME ZONE
(HAWALL/EASTTERN/INDIANA/CENTRAL/MOUNTAIN/ARIZONA/PACIFIC/ALASKA)
f. Daylight Saving(ON/OFF)

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D. SETUP：
a. LANGUAGE (ENGLISH/FRENCH/SPANISH)
b. SLEEP TIMER (OFF/30/60/90/120)
c. ANALOG CC (OFF/CC1/CC2/CC3/CC4)
d. DIGITAL CC(OFF/SERVICE1/ SERVICE2/
SERVICE3/ SERVICE4/ SERVICE5/ SERVICE6)
e. DIGITAL CC STYLE
e-1. CAPTION STYLE
(AS BROADCASTER/CUSTOM)
e-2. FONT SIZE(SMALL/MEDIUM/LARGE)
e-3. FONT COLOR
(GREEN/BLUE//RED/CYAN/YELLOW/MAGENTA/BLACK/WHITE)
e-4. FONT OPACITY
(SOLID/TRANSLUCENT/TRANSPARENT)
e-5. BACKGROUND COLOR
(GREEN/BLUE//RED/CYAN/YELLOW/MAGENTA/BLACK/WHITE)
e-6. BACKGROUND OPACITY
(SOLID/TRANSLUCENT/TRANSPARENT)
e-7. WINDOW COLOR
(GREEN/BLUE//RED/CYAN/YELLOW/MAGENTA/BLACK/WHITE)
e-8. WINDOW OPATITY
(SOLID/TRANSLUCENT/TRANSPARENT)
f. Image Cleaner
g. RESET ALL SETTING

E. PARENTAL：
a. PASSWORD
a-1. CHANNEL BLOCK
a-2. TV RATING
a-3. MOVIE RATING
a-4. BLOCK TV UNRATED
a-5. ACCESS CODE EDIT

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RGB Mode
A. PICTURE ADJUST：
a. AUTO PICTURE (Run)
b. BACKLIGHT (0~100)
c. BRIGHTNESS (0~100)
d. CONTRAST (0~100)
e. COLOR TEMPERATURE(CUSTOM, 6500K,9300K)
f. H-SIZE (0~255)
g. H-POSITION (0~100)
h. V-POSITION (0~100)
i. FINE TUNE (0~31)

B. AUDIO：
a. VOLUME (0~100)
b. BASS (0~100)
c. TREBLE (0~100)
d. DCR( Off / 1/4 / 1/2 / 3/4 / Full )
e. SPEAKERS (ON/OFF)
f. Wireless SPEAKERS (ON/OFF)
g. SPDIF IN( Off / AV1 / AV2 / COMPONENT1 /COMPONENT2 / HDMI1 / HDMI2 / HDMI3 )
h. SPEAKER SETTING
h-1. SPEAKER LOCATION
( Auto / Left / Center / Right / Rear Right / SubWoofer / Rear Left )
h-2. TRIM
h-2-1. Left(0~100)
h-2-2. Right(0~100)
h-2-3. Rear Left(0~100)
h-2-4. Rear Right(0~100)
h-2-5. Center(0~100)
h-2-6. Sub Woofer(0~100)
h-3. SPEAKER DISTANCE SETUP
h-3-1. TV (0~15ft.)
h-3-2. Rear Left(0~15ft.)
h-3-2. Rear Right(0~15ft.)

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C. SETUP：
a. LANGUAGE (ENGLISH/FRENCH/SPANISH)
b. SLEEP TIMER (OFF/30/60/90/120)
c. Image Cleaner
d. RESET ALL SETTING

HDMI MODE
A. PICTURE：
a. PICTURE MODE (CUSTOM/ STANDARD /MOVIE / GAME)
b. BRIGHTNESS (0~100)
c. CONTRAST (0~100)
d. COLOR (0~100)
e. TINT (-32~32)
f. SHARPNESS (0~100)
g. COLOR TEMPERATURE
(CUSTOM/COOL/NORMAL/WARM)
h. ADVANCED VIDEO
h-1. DNR(OFF/LOW/MEDIUM/STRONG)
h-2. BLACK LEVEL EXTENDER (ON/OFF)
h-3. WHITE PEAK LIMITATOR (ON/OFF)
h-4 CTI(OFF/LOW/MEDIUM/STRONG)
h-5 FLESH TONE (ON/OFF)
h-6 ADAPTIVE LUMA (ON/OFF)

B. AUDIO：
a. VOLUME (0~100)
b. BASS (0~100)
c. TREBLE (0~100)
d. DCR( Off / 1/4 / 1/2 / 3/4 / Full )
e. SPEAKERS (ON/OFF)
f. Wireless SPEAKERS (ON/OFF)
g. SPDIF IN( Off / AV1 / AV2 / COMPONENT1 /COMPONENT2 / HDMI1 / HDMI2 / HDMI3 )
h. SPEAKER SETTING
h-1. SPEAKER LOCATION
( Auto / Left / Center / Right / Rear Right / SubWoofer / Rear Left )

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 h-2. TRIM
h-2-1. Left(0~100)
h-2-2. Right(0~100)
h-2-3. Rear Left(0~100)
h-2-4. Rear Right(0~100)
h-2-5. Center(0~100)
h-2-6. Sub Woofer(0~100)
h-3. SPEAKER DISTANCE SETUP
h-3-1. TV (0~15ft.)
h-3-2. Rear Left(0~15ft.)
h-3-3. Rear Right(0~15ft.)

C. SETUP：
a. LANGUAGE (ENGLISH/FRENCH/SPANISH)
b. SLEEP TIMER (OFF/30/60/90/120)
c. Image Cleaner
d. RESET ALL SETTING

Video Sources：
AV1、AV2、COMPONENT1、COMPONENT2
A. PICTURE：
a. PICTURE MODE (CUSTOM/ STANDARD /MOVIE / GAME)
b. BRIGHTNESS (0~100)
c. CONTRAST (0~100)
d. COLOR (0~100)
e. TINT (-32~32)
f. SHARPNESS (0~100)
g. COLOR TEMPERATURE(CUSTOM/COOL/NORMAL/WARM)
h. ADVANCED VIDEO
h-1. DNR(OFF/LOW/MEDIUM/STRONG)
h-2. BLACK LEVEL EXTENDER (ON/OFF)
h-3. WHITE PEAK LIMITATOR (ON/OFF)
h-4 CTI(OFF/LOW/MEDIUM/STRONG)
h-5 FLESH TONE (ON/OFF)
h-6 ADAPTIVE LUMA (ON/OFF)

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B. AUDIO：
a. VOLUME (0~100)
b. BASS (0~100)
c. TREBLE (0~100)
d. DCR( Off / 1/4 / 1/2 / 3/4 / Full )
e. SPEAKERS (ON/OFF)
f. Wireless SPEAKERS (ON/OFF)
g. SPDIF IN( Off / AV1 / AV2 / COMPONENT1 /COMPONENT2 / HDMI1 / HDMI2 / HDMI3 )
h. SPEAKER SETTING
h-1. SPEAKER LOCATION( Auto / Left / Center / Right / Rear Right / SubWoofer / Rear
Left )
h-2. TRIM
h-2-1. Left(0~100)
h-2-2. Right(0~100)
h-2-3. Rear Left(0~100)
h-2-4. Rear Right(0~100)
h-2-5. Center(0~100)
h-2-6. Sub Woofer(0~100)
h-3. SPEAKER DISTANCE SETUP
h-3-1. TV (0~15ft.)
h-3-2. Rear Left(0~15ft.)
h-3-3. Rear Right(0~15ft.)

C. SETUP：
a. LANGUAGE (ENGLISH/FRENCH/SPANISH)
b. SLEEP TIMER (OFF/30/60/90/120)
c. Analog CC(Off/CC1/CC2/CC3/CC4)
d. Image Cleaner
e. RESET ALL SETTING

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D. PARENTAL：
a. PASSWORD
a-1. CHANNEL BLOCK
a-2. TV RATING
a-3. MOVIE RATING
a-4. BLOCK TV UNRATED
a-5. ACCESS CODE EDIT

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File No. SG-0228
Chapter 9 Trouble shooting
MONITOR DISPLAY NOTHING (PC MODE)

Start

N0
1. Is Power board output
+5VSB &DV12?
LED is lighted
2. Is J10 connector good?
3. Is DC-DC OK?
4. Is U1 (+5V) working ok?

Yes

It is in power saving
N0 1. Check video cable
LED is lighting? 2. Is the timing supported?
3. Check sync input
4. Check VGA SOG rout if analog
(SOG)

Yes

N0

Is backlight on? 1.Check J10 PIN14

2.Is Power Board ok?

Yes
Yes
N0 It means data to LVDS
1.Is J7 connecting OK?
U14 no data out? 2.Check J1 +5V & +12V
3.Is panel ok?
4. Check P3 D-sub Input correct
5. Check analog input route

Yes

END

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(TV, COMPOSITE VIDEO ) IS NOT DISPLAY CORRECTLY

Start

N0

Input signal good? 1.Check video

2.Check DVD player

Yes
N0
1.Check P11(VIDEO) signal
2.Check signal between U14 (IF IN AV
mode)
U14 input correct?
3.Check Tuner & U13 (IF TV mode)

Yes
N0

1. Check U14 :DV33&DV12&AV15&AV12

2. Check X1 is OK?
U14 output correct?

Yes
N0

1.Check LVDS LINE

2.Check U14 clock (27MHz)
LVDS output correct?
3.Check LVDS 5V or 12V

Yes

1.Chcak J7 Connect is good?

2.Is panel working ok?

END

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(COMPONENT) IS NOT DISPLAY CORRECTLY

Start

N0

Input signal good? 1.Check video

2.Check host’s setting

Yes
N0

P1 input correct?
1.Check signal between P1
2.Check power 12V& 5v

Yes

N0 1.Check signal between U14&P1

2.Check U14 Clock (27MHZ)
U14 input correct? 3.Check U14 :DV33&DV12&AV15&AV12

Yes
N0

1.Check U14
LVDS output correct ? 2. Check LVDS 5V or 12V

Yes

1.Is J7 connected good?

2.Is panel working ok?

END

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(HDMI) IS NOT DISPLAY CORRECTLY

Start

N0

Input signal good? 1.Check video

2.Check host’s setting

N0 1.Check p6 & p7& P13 connect

U22 input correct?
2.Check U22 signal

Yes

N0

U14 no data out ? 1.Check U14 power

2.Check between signal U22 and U14
3.Check U14 clock 27MHZ

Yes

1.Is J7 connected good?

2.Is panel working ok?

Yes

END

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ROUBLE OF DC-DC CONVERTER

Start

Yes
The voltage is about + 5V
N0 1.Check power board
J10 PIN10,11,12 2.Check power cable connection J10

Yes
The voltage is about + 12V while power switch on
N0 1.J10 connection good
J10 PIN 2,3 2.Check J10 Pin2,3 transform +5V_TUNER
3.Check power board

Yes
N0

U1 pin 5 6 7 8 The voltage is about +5V while power switch on

1.J10 connection good
2. Check U14 OPWRSB & OPCTRL2 Pin
Yes
N0

U4,U2 pin2 The voltage is about +3.3V

Yes
N0

U10 pin2 The voltage is about +2.6V

Yes
N0

U33 pin2 The voltage is about +3.3V

Yes
N0

U7 pin2 The voltage is about +1.2V

Yes

U9 pin2 The voltage is about +1.5V

Yes

The voltage is about +3.3V

U35 pin2

END

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TROUBLE OF DDC READING

Start

Yes
Support DDC1/2B
N0 1.Analog cable ok?
2.Check signal (U21 to P3)
Analog DDC 3.Check U21 Voltage
4.Is compliant protocol?

Yes

Support DDC1/2B
N0 1.Analog cable ok?
2.Check signal (U23 to P6)
HDMIDDC 3.Check signal (U25 to P7)
4.Check signal (U26 to P13)
5.Is compliant protocol?

Yes

END

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(TV_SIDE, AUDIO) IS NOT DISPLAY CORRECTLY

Start

N0

Input signal good? 1. Check Audio source

2. Check the player of source

Yes
N0
1. Check signal of Main Board
2. Check signal of Audio Board (J1)
3. Check the wire of Main Board to
J1 input correct?
Audio Board

Yes
N0

1. Check the output volt of U1 and U2.

U1.U2 output correct?

Yes
N0

1. Check C200(Ch R) and C201(Ch

U7.U8 signal correct? L) and C271 (Ch CT)

Yes

N0
1. Check VCC of U7 and U8.
2. Check 1/2VCC of U7 and U8
U7.U8 Volt correct?
(R202.R203.R271).
3. Check ZD2(Ch R) and ZD3(Ch L)
and ZD4 (Ch CT)
Yes

N0
1. Check feedback resistor and
capacitor.
U7.U8 output correct?

Yes

END

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(SUBWOOFER_SIDE, AUDIO) IS NOT DISPLAY CORRECTLY

Start

N0

Input signal good? 1. Check Audio source

2. Check the player of source

Yes
N0
1. Check signal of Main Board
2. Check signal of Audio Board (J1)
3. Having TX and RX module or not?
J1 input correct?

Yes
N0

1. Check the output volt of U1 ~ U6.

U1~U6output correct?

Yes
N0

1. Check C200(Ch R) and C201(Ch L)

and C170 (Ch SW) and C171 (VB)
U7.U8 signal correct?

Yes

N0
1. Check VCC of U7 and U8.
2. Check 1/2VCC of U7 (R202.R203).
U7.U8 Volt correct?
3. Check ZD2(Ch R) and ZD3(Ch L)
and ZD4 (Ch CT)

Yes

N0
1. Check feedback resistor and
capacitor.
U7.U8 output correct?

Yes

END

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