Page 1
Service Manual 
Model #: VIZIO P50HDM 
V, Inc 
320A Kalmus Drive Costa Mesa, CA 92626 
TEL : +714-668-0588  FAX :+714-668-9099
-TOP Confidential - 
Page 2
Table of Contents 
CONTENTS PAGE 
Sections 
 1. Features     1-1  
 2. Specifications    2-1 
 3. On Screen Display     3-1 
 4. Factory Preset Timings  
 5. Pin Assignment 
 4-1 
 5-1 
 6. BLOCK DIAGRAM    6-1 
 7. Main Board I/O Connections     7-1 
 8. Theory of Circuit Operation    8-1 
 9. Waveforms    9-1 
 10. Trouble Shooting     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 P50HDM Service Manual 
Page 3
VINC                   Service Manual  
 
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 P50HDM Service Manual 
Page 4
Chapter 1   Features 
 Wall-mountable  
 New WIDE HD Plasma Panel:1366 x 768 (H x V)  
 TruSurround XT sound system and DCDi by Faroujia video image  
 High definition digital interface – HDMI  
 HDCP supportive  
 Multiple-screen display (picture-on-picture/picture-in-picture)  
 Selectable  
   4-language On Screen Display 
   2 S-video and Composite video inputs 
   2 Component video inputs 
   2 HDMI inputs 
   6 audio stereos, 1 PC Mini-Jack 
   Supporting DVI converted to HDMI  
 Closed  
 Gloss front bezel  
   The thinnest model of this size: 99 mm 
CONFIDENTIAL – DO NOT COPY 
Page 1-1 
File No. SG-0173
Page 5
Chapter 2   Specification  
1. OPTICAL CHARACTERISTICS 
Item Specification 
Display Pixels   1366 (H) x 768 (V) pixels 
Pixel Pitch   0.810 mm (H) X 0.810mm (V) 
Pixel Type   Non-stripe 
Color Depth   1,024 (R) x 1,024 (G) x 1,024 (B) colors 
Active Display Area   1106.5 mm (H) x 622.1 mm(V)  
Brightness (panel spec)   1000 cd/m2 (Typical) 
     (w/glass filter)   Min.300 cd/m 
Contrast ratio (panel spec) 8000:1 (Typical, dark room) 
Color Coordinates (typical)  
White (Panel spec) x=0.300±0.02, y=0.300±0.02 
White (w/glass filter) Warm (5400K) 
 Standard 
 Cool 
2. INPUT SOURCE 
RGB Signal:  H: support to 30-80KHz  
V: support to 60-85Hz 
Pixel Clock: support to 108MHz 
HDMI Signal: H: 15.734KHz  V: 60Hz (480i)   
H: 31KHz   V: 60Hz (480p) 
H: 45KHz   V: 60Hz (720p) 
H: 33KHz   V: 60Hz (1080i) 
S-Video:  Video (Y): Analog 0.1Vp-p/75Ω  
 Ω  
CONFIDENTIAL – DO NOT COPY 
Page 2-1 
File No. SG-0173
Page 6
Composite Video signal: H: 15.734KHz  V: 60Hz  (NTSC) 
Component signal:  YPbPr/YCbCr 
H: 15.734KHz  V: 60Hz (NTSC-480i) 
H: 31KHz   V: 60Hz(NTSC-480p) 
H: 45KHz   V: 60Hz(NTSC-720p) 
H: 33KHz   V: 60Hz(NTSC-1080i) 
3. INPUT CONNECTORS 
Input Label   Connector Type   Input Label   Connector Type 
SERVICE   RJ-11 x 1   ANALOG HD1   YPb/Cb Pr/Cr RCA Jack x 3 
Audio RCA Jack x 2  
DIGITAL HD1   19 pin HDMI x 1 
Audio RCA Jack x 2  
DIGITAL HD2   19 pin HDMI x 1 
Audio RCA Jack x 2 
RGB   D-sub 15 pin x 1 
Mini Jack x 1 (Audio 
input) 
ANALOG HD2   YPb/Cb Pr/Cr RCA Jackx 3 
AV1   RCA Jack (CVBS) x 3 
AV2   RCA Jack (CVBS) x 3 
4. OUTPUT CONNECTORS 
a. Audio RCA Jack x 2 
b. 3.5mm Mini-jack earphone x 1  
5. POWER SUPPLY 
Consumption: 550W MAXPower OFF: less than 3W  
6. SPEAKER 
Output 8Ω /10W (max) X2 
Audio RCA Jack x 2 
S-video 4 pin mini DIN x 1 
S-video 4 pin mini DIN x 1 
CONFIDENTIAL – DO NOT COPY 
Page 2-2 
File No. SG-0173
Page 7
7. ENVIRONMENT 
Operating 
a. Temperature: 0~40℃   
b. Relative 20%~80% RH   
c. Altitude: 0~6,560 ft   
Non-operating 
a. Temperature: -20~60℃   
b. Relative 10%~90% RH   
c. Altitude: 0~9,840 ft   
8. DIMENSIONS  
a. Height: 871 mm   
b. Width: 1241mm   
c. Depth: 310 mm (with standard), 99 mm (without standard)   
9. WEIGHT  
a. Net: 55.2 +/- 0.5 kgs   
b. Gross: 65.2 +/- 0.5 kgs   
CONFIDENTIAL – DO NOT COPY 
Page 2-3 
File No. SG-0173
Page 8
Chapter 3   On Screen Display 
Main unit button 
POWER 
MENU  
▲ 
▼ 
VOL-/W  
VOL+/X  
INPUT  
OSD Adjustment 
Mode 
Image Settings 
VIDEO 
VIDEO Saturation(0~100)             
VIDEO Hue(-50~50)             
VIDEO Sharpness(0~24)             
VIDEO     Noise     
VIDEO         Motion(0~16) 
VIDEO         Digital(0~64) 
VIDEO       Fleshtone   Off, High, Moderate, Low   
VIDEO     
Picture Mode(User, Vivid, 
Movie, Game, Sport) 
 Brightness(0~100)           
 Contrast(0~100)             
 Advanced             
Dynamic Contrast 
(0, 1, 2, 3) 
PC     Auto     
PC     Image     
PC     Phase     
PC       Clocks / Line         
PC     Color     
PC         Warm(5400K) 
CONFIDENTIAL – DO NOT COPY 
Page 3-1 
File No. SG-0173
Page 9
PC         Standard(6500K) 
PC         Cool(9300K) 
PC         User     
PC             Red(0~100) 
PC             Green(0~100) 
PC             Blue(0~100) 
Display Settings 
VIDEO Aspect 
Zoom, Panoramic* 
PC   Aspect Ratio    Wide, Normal          
 PIP             
Off, Large PIP, Small PIP, 
     PIP 
POP 
Top-Left, Top-Right, 
Wide, Normal, 
     PIP 
Bottom-Left, 
Bottom-Right 
PIP Input**  
Audio Settings 
Bass(0~20)             
Treble(0~20)             
Balance(-10~10)             
SRS TS XT(Off, On)             
Auto Volume(On, Off)             
Speakers(On, Off)          
Audio Out***  
Fixed Volume, 
Variable Volume 
Parental Controls 
VIDEO Password 
VIDEO 
Settings         
VIDEO      TV 
CONFIDENTIAL – DO NOT COPY 
Page 3-2 
File No. SG-0173
Page 10
VIDEO         TV 
(Unblocked, 
Blocked) 
VIDEO         TV 
(Unblocked, 
Blocked) 
VIDEO            TV G (Unblocked, 
Blocked) 
VIDEO            TV PG (Unblocked, 
Blocked) 
VIDEO            TV 14 (Unblocked, 
Blocked) 
VIDEO            TV MA (Unblocked, 
Blocked) 
VIDEO         Unblocked 
VIDEO      Movie 
VIDEO         Movie 
(Unblocked, 
Blocked) 
VIDEO         Movie 
(Unblocked, 
Blocked) 
VIDEO         Movie 
(Unblocked, 
Blocked) 
VIDEO         Movie 
(Unblocked, 
Blocked) 
VIDEO         Movie 
(Unblocked, 
Blocked) 
VIDEO         Movie 
(Unblocked, 
Blocked) 
VIDEO 
   Unblocked 
 Block 
CONFIDENTIAL – DO NOT COPY 
File No. SG-0173
Page 3-3 
Page 11
VIDEO 
Change Password      
VIDEO 
VIDEO 
VIDEO 
Setup 
  Closed             
       Captions on mute 
  Language   English,  
    Factory Reset (Yes, No)           
Clear All (No, Yes)        
Display 
(On, Off)         
Español, Italiano         
Please enter new 
password     
Please re-enter new 
password     
Off, CC1, CC2, CC3, 
CC4, TEXT1, TEXT2, 
TEXT3, TEXT4 
 Image          
  Firmware             
* HDMI and Component 720P/1080i inputs do not support Panoramic. 
** See below for detailed information regarding the PiP sources. 
CONFIDENTIAL – DO NOT COPY 
Page 3-4 
File No. SG-0173
Page 12
Main \ Sub 
AV1 
(S-VIDEO) 
AV2 
(S-VIDEO) 
AV1 
(VIDEO) 
AV2 
(VIDEO) 
Analog 
HD1 
Analog 
HD2 
Digital 
HD1 
AV1 
(S-VIDEO) 
AV2 
(S-VIDEO) 
AV1 
(VIDEO)
AV2 
(VIDEO)
Analog 
HD1 
Analog 
HD2 
Digital 
HD1 
Digital 
RGB 
HD2 
 x x x x x x x x 
x  x x x x x x x 
x x  x x x x x x 
x x x  x x x x x 
x  x   x x x x 
x x x x x x 
x x x x x x 
Digital 
HD2 
RGB 
x x x x x x 
x  x  x x x x  
Remark:  
(1): “x” – Indicates which inputs are available for PIP and POP modes. 
(2): For AV1 and AV2, S-Video has priority.  If a signal is connected to AV1 S-Video by itself or 
signals are connected to AV1 S-Video and AV1 Video simultaneously, then S-Video will 
be the only choice for AV1.  If a signal is connected to AV1 Video only, then Video will be 
the only choice for AV1.  The same input priority scheme applies to AV2. 
*** When Speakers off 
CONFIDENTIAL – DO NOT COPY 
Page 3-5 
File No. SG-0173
Page 13
Chapter 10 PDP Trouble Shooting 
A. SYSTEM OVERVIEW 
Y driver board 
Display board  
Main board  
X driver board 
Power supply board  
Audio Voltage 
selectior 
EMI filter  
Audio power 
IR boar
CONFIDENTIAL – DO NOT COPY  
File No. SG-0174
Page 10-1 
Page 14
B. PCB PARTS NAME/NUMBER AND FUNCTION DESCRIPTION 
PAR T NA M E    PART NUMBER   FUNCTION  DESCRIPTION   
POWER SUPPLY BOARD    PROVIDE ALL THE POWER FOR TV SET  
X DRIVER BOARD    X ELECTRODE DRIVING BOARD  
Y DRIVER BOARD    Y ELECTRODE DRIVING BOARD   
AUDIO POWER SELECTOR    AUDIO POWER SUPPLY(+30V OR  +24V)  
MAIN BOARD  385000120150 CONNECTING TO TRANSFER DISPLY SIGNAL   
TO PDP  SET, AMPLIFIER THE AUDIO SIGNAL TO   
THE SPEAKER  
IR BOARD 385000120189 RECEIVE THE REMOTE CONTROLER AND DISPLAY   
SYSTEM STATUS LED  
DISPLAY BOARD 385000120156 KEYPAD FUNCTION FOR MANUAL OPERATE TV     
C. BOARD PICTURE 
MAIN BOARD  
CONFIDENTIAL – DO NOT COPY 
Page 10-2 
File No. SG-0174
Page 15
DISPLAY BOARD   
IR BOARD  
CONFIDENTIAL – DO NOT COPY 
Page 10-3 
File No. SG-0174
Page 16
PDP  DISPLAY NOTHING 
1. Main board block diagram 
U26 MAX232A
UC_SCL/UC_SDA
ATXD_HUD
ARXD_HUD
U40 24LC128 
EEPROM(8051)
U38 
SM5964-C40J
J9
2
1
3  ATXD_HUD
J10
2
1
3
U20 4052 
4/1 x2 I/O
ARXD
ATXD
ARXD_HUD
HY5DU56822CT-D4 
U17 DDR RAM CTZ
HY5DU56822CT-D4 
U16 DDR RAM HUD
W7
W14
W8
CN17
W13
CN16
W6
Component 1
Component 2
W11
W10
W5
W13
U37 24LC02 
EEPROM HDMI1
U40 24LC02 
EEPROM HDMI2
AudioAV1_R/L
CVBS1
CVBS2
AudioAV2_R/L
Y1/C1
Y2/C2
Y Pr Pb
Y Pr Pb
ANLOG DDC 
VGA_SCL / VGA_SDA
VS / HS
R G B
ATSC Y 
Pr Pb
U42 Sil 9011 
HDMI RS
U35 Sil 9011 
HDMI RS
U21 24LC02 
EEPROM VGA
U45 74HCT14 
Inverting Schmitt Trgg er
U22 M61323FP 
VEDIO SW
U23 M61323FP 
VEDIO SW
U24 M61323FP 
VEDIO SW
ADATA[0:23]
BDATA[0:23]
U37 CS3443 
HDMI2 LR ADC
U36 CS3443 
HDMI1 LR ADC
U46 IDTQS3253 
HDMI1 AUDIO SW
U42 IDTQS3253 
HDMI1 AUDIO SW
HDMI1_AUDIO_L/R 
HDMI2_AUDIO_L/R
AudioAV1_R/L 
AudioAV1_R/L
COMP1_Audio_R/L 
COMP2_Audio_R/L 
VGA_AUDIO_L/R
U28 MAX4550 
AUDIO SW 
4/2 I/O
U27 MAX4550 
AUDIO SW 
4/2 I/O
51_RXD/51_TXD
VGA_SCL / VGA_SDA
CH4_R/L 
CH3_R/L
CH2_R/L 
CH1_R/L
SV4_CTZ 
SV2_CTZ 
SV3_CTZ 
A1_CTZ 
B1_CTZ 
C1_CTZ
ATXD_HUD
ARXD_HUD
SV4_HUD 
SV2_HUD 
SV3_HUD 
A1_HUD 
B1_HUD 
C1_HUD
ARXD 
ATXD
U32 P4450G 
AUDIO 
PROCESS
FL8532_CTZ
FL8125_HUD
Lineout_R/L
HLIN/HRIN
SCL-33V / SDA-33V
W1
NC7SB3157 
U18 BUS SW
XU1 A29LV320D 
MEMERY_CTZ
U11 24LC32 
EEPROM HUD
U11 SST25VF040 
FLASH 512K HUD
U33 PT2308 
AUDIO DRIVER
U34 PT2308 
AUDIO DRIVER
KEY PAD 
CN5
F75373S 
U25
風扇控制
TDA8946AJ 
AUDIO_AMP
Display
W12
CONFIDENTIAL – DO NOT COPY 
Page10-4 
File No. SG-0174
Page 17
PDP DISPLAY NOTHING(Analog HD1/AC on/off default)
Start
Powe r LED is ligh ting?
Yes
Powe r LED is ligh ting?
Yes
Powe r LED is ligh ting?
Yes
PDP DISPLAY NOTHING(Analog HD1 without Y signal)
No
Check AC pow er cord
No
Press Meun or Info.
Is there any OSD’s logo
Check internal cable?
1.LVDS cable.      
No
Check internal cable?
1.CN1’s cabl e      
2.CN3’s cabl e      
D10,D11 LED is lighting?
Yes
Check input source
No
No
Check W1 pin 27 is high?
(Display_ON)
No
Check main board CN3 pin 4Î studyby +5V    
Check CN3 pin 3Î  RLY_ON(high)           
Check CN3 pin 2Î VS_ON(high) 
No
No
U13 fail
No
No
Check Fuse open?
(F2,F3,F4)
Yes
Yes
Yes
Yes
Remove R87.
Check U13 pin AD14.
Is AD14 high? 
Yse
Check U3.4Î 3.3V 
Check U8Î 1.8V 
Check U9Î 2.5V 
If power_off Î high   
U2,U5Î  ON        
Check +3.3V_SW    
,+5V_SW,+12V_SW
(pin 5,6 and pin 7,8) 
No
U13 fail
Check CN1Î pin 1,2,3 = +5V
pin 7,8 = +12V 
No
Yes
Panel power
fail
Fuse fail
No
U3 fail
No
U8 fail
No
U9 fail
No
U2,U5 fail
Block 1
No
Is picture on screen?
Check component 1 
(Y signal) Î C252  
Is there sync?     
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
CONFIDENTIAL – DO NOT COPY 
Yes
No
Trace componect 1 from 
No
Input To U13 circuit
Check R190,R191
U13 fail
1
Page10-5 
File No. SG-0174
Page 18
PDP DISPLAY NOTHING(Analog HD1 without Pb signal)
BLOCK 1
Is picture on screen?
No
Check component 1 
(Pb signal) Î C259  
Is there sync?     
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
No
Trace componect 1 from 
Input To U13 circuit
Check R196,R198
Yes
No
U13 fail
PDP DISPLAY NOTHING(Analog HD1 without Pr signal)
BLOCK 1
Is picture on screen?
No
Check component 1
(Pr signal) ÎC264 
Is there sync?     
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
No
Trace componect 1 from 
Input To U13 circuit
Check R204,R201
Yes
No
U13 fail
PDP DISPLAY NOTHING(Analog HD1 on PIP mode without Y signal)
BLOCK 1
No
Is picture on screen?
Does scaler detect the signal?
CONFIDENTIAL – DO NOT COPY 
Check component 1
(Y signal) =>C255  
Is there sync?     
Yes
Use GProbe connect 
from main to PC.
No
Trace componect 1 from 
Input To U10 circuit 
Check R193,R191
No
U10 fail
2
Page10-6 
File No. SG-0174
Page 19
PDP DISPLAY NOTHING(Analog HD1 on PIP mode without Pb signal)
BLOCK 1
Is picture on screen?
No
Check component 1
(Pb signal) Î C255 
Is there sync?     
Use GProbe connect 
from main to PC.
Does scaler de tect the signal?
No
Trace componect 1 from 
Input To U10 circuit
Check R200,R198
Yes
No
U10 fail
PDP DISPLAY NOTHING(Analog HD1 on PIP mode without Pr signal)
BLOCK 1
Is picture on screen?
No
Check component 1 
(Pr signal) Î C255 
Is there sync?     
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
No
Trace componect 1 from 
Input To U10 circuit
Check R205,R204
Yes
No
U10 fail
PDP DISPLAY NOTHING(Analog HD2 without Y signal)
BLOCK 1
No
Check component 2
Is picture on screen?
(Y signal) Î C258,R195 
Is there sync?     
Use GProbe connect 
Does scaler detect the signal?
CONFIDENTIAL – DO NOT COPY 
Yes
from main to PC.
Check U23 
No
No
U13 fail
outnputÎ pin 31
InputÎ  pin 13
Input clamp voltageÎpin 3(+5V) 
Output clamp voltageÎpin 32(+5V) 
VCC3Î pin 22,23(+5V)
Input_switch_selectÎ high(+5V)
Yes
No
U23 fail
Check before U23’s circuit
1.C263,C265(AC coupled)
2.R209                
3.R216(75ohm)         
No
Input source fail
3
Page10-7 
File No. SG-0174
Page 20
PDP DISPLAY NOTHING(Analog HD2 without Pb signal)
BLOCK 1
Check U23 
Is no blue color on screen?
No
Check component 2
(Pb signal) Î C260,R197 
Is there sync?     
No
Yes
outnputÎ pin 28
Inpu tÎ  pin 15
Input clamp voltageÎpin 5(+5V) 
Output clamp voltageÎpin 29(+5V) 
VCC3Î pin 22,23(+5V)
Input_switch_selectÎ high(+5V)
No
U23 fail
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
No
U13 fail
Yes
Check before U23’s circuit
1.C268,C269(AC coupled)
2.R211                
3.R217(75ohm)         
No
PDP DISPLAY NOTHING(Analog HD2 without Pr signal)
BLOCK 1
Check U23 
outnputÎ pin 34
Inpu tÎ  pin 11
Input clamp voltageÎpin 1(+5V) 
Output clamp voltageÎpin 35(+5V) 
VCC3Î pin 22,23(+5V)
Input_switch_selectÎ high(+5V)
Yes
Check before U23’s circuit
1.C256,C261(AC coupled)
2.R215                
3.R218(75ohm)         
No
U23 fail
No
Is no red color on screen ?
No
Check component 2
(Pr sign al) Î C254,R192 
Is there signal?     
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
No
Yes
No
U13 fail
PDP DISPLAY NOTHING(Analog HD2 on PIP mode without Y signal)
BLOCK 1
Input source fail
Input source fail
No
Check component 2
Is picture on screen?
(Y signa l) Î C287,R212 
Is there sync?     
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
CONFIDENTIAL – DO NOT COPY 
Check U24 
No
Yes
No
U10 fail
outnputÎ pin 31
Inpu tÎ  pin 13
Input clamp voltageÎpin 3(+5V) 
Output clamp voltageÎpin 3 2(+5V) 
VCC3Î pin 22,23(+5V)
Input_switch_selectÎ high(+5V)
Yes
No
U24 fail
Check before U24’s circuit
1.C282,C285(AC couple d)
2.R209                
3.R216(75ohm)         
No
Input source fail
4
Page10-8 
File No. SG-0174
Page 21
PDP DISPLAY NOTHING(Analog HD2 on PIP mode without Pb signal)
BLOCK 1
Check U24 
Is no blue color on screen?
No
Check component 2
(Pb signal) Î C288,R213 
Is there sync?     
No
Yes
outnputÎ pin 28
InputÎ  pin 15
Input clamp voltageÎpin 5(+5 V) 
Output clamp voltageÎ pin 29(+5V)
VCC3Î pin 22,23(+5V)
Input_switch_selectÎ high(+5V)
No
U24 fail
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
No
U10 fail
Yes
Check before U24’s circuit
1.C289,C290(AC coupled)
2.R211                
3.R217(75ohm)         
No
PDP DISPLAY NOTHING(Analog HD2 on PIP mode without Pr signal)
BLOCK 1
Check U24 
Is no red color on screen?
No
Check component 2
(Pr signal) Î C284,R210 
Is there signal?     
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
No
Yes
No
U10 fail
outnputÎ pin 34
InputÎ  pin 11
Input clamp voltageÎpin 1(+5 V) 
Output clamp voltageÎpin 35(+5V) 
VCC3Î pin 22,23(+5V)
Input_switch_selectÎ high(+5V)
Yes
No
U24 fail
Check before U24’s circuit
1.C276,C281(AC coupled)
2.R215                
3.R218(75ohm)         
No
PDP DISPLAY NOTHING(RGB)
BLOCK 1
Yes
Check input source
Check U45 
pin 14Î +3.3V 
Yes
Is picture on screen?
H sync output Î  U45 pin4,R181
No
V sync output Î  U45 pin8,R184
Yes
Check U45
Is there signal?     
No
Check U45
H sync input Î  U45 pin1,R185 
V sync input Î  U45 pin5,R187
No
Input source fail
Input source fail
U45 fail
Check U22’s signal output
R signal ÎC238,R180,R169,U22.34  
G signal ÎC237,R177,R171,U22.31  
B signal ÎC235,R174,R176,U22.28 
CONFIDENTIAL – DO NOT COPY 
No
R Î  pin 2, C239;C241(AC coupled),R186,R172(75ohm) 
G Î  Pin 4,C234;C236(AC coupled),R166,R175(75ohm) 
B Î  Pin 6, C221;C224(AC coupled),R164,R173 (75ohm)
Check U22 input signal
Yes
Input clamp voltageÎpin 1(+5V_V1)  
Output clamp voltageÎpin 35(+5V) 
VCC3Î pin 22,23(+5V)
Input_switch_selectÎ low (0V)
Check U22
No
U22 fail
5
Page10-9 
File No. SG-0174
Page 22
PDP DISPLAY NOTHING(RGB on PIP mode without screen)
BLOCK 1
Is picture on screen?
Check U22’s signal output
R signal ÎC233,R180,R169,U22.34  
G signal ÎC232,R177,R171,U22.31  
B signal ÎC231,R174,R176,U22.28 
H sync output Î  U45 pin4,R181
No
V sync output Î  U45 pin8,R184
Yes
Check U45
Is there signal?     
No
No
R Î  pin 2, C239;C241(AC coupled),R186,R172(75ohm) 
G Î  Pin 4,C234;C236(AC coupled),R166,R175(75ohm) 
B Î  Pin 6,C221;C224(AC coupled),R164,R173(75ohm)
Check U22 input signal
Check U45
H sync input Î  U45 pin1,R185 
V sync input Î  U45 pin5 ,R187
No
Yes
Input clamp voltageÎpin 1(+5V_V1)  
Output clamp voltageÎpin 35(+5V)  
VCC3Î pin 22,23(+5V)
Input_switch_selectÎlow (0V) 
Check input source
Check U22
Yes
Check U45 
pin 14Î +3.3V 
Yes
U45 fail
No
U22 fail
CONFIDENTIAL – DO NOT COPY 
6
Page10-10 
File No. SG-0174
Page 23
PDP DISPLAY NOTHING(Composite 1 without screen)
BLOCK 1
Is picture on screen?
No
Check C310,R275,R274
Is there signal?
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
Check:                 
1.C309 (signal AC coupled)
2.R276                 
3.R279(75ohm impedance) 
Is there signal?          
No
Check Q28’s emitter.
Is there signal?
Yes
No
Q13 fail
Yes
No
Check input source
No
Check Q28’s Base.
Is there signal?
Check collector
voltage(+5V).
PDP DISPLAY NOTHING(Composite 1 on PIP without screen)
BLOCK 1
No
Q28 fail
No
Is picture on screen?
Check C308,R273,R274
Does scaler detect the signal?
CONFIDENTIAL – DO NOT COPY 
Is there signal?
Yes
Use GProbe connect 
from main to PC.
Check:                 
1.C309 (signal AC coupled)
2.R276                 
3.R279(75ohm impedance) 
Is there signal?          
No
Yes
Check Q28’s emitter.
Is there signal?
No
Q10 fail
No
No
Check input source
Check Q28’s Base.
Is there signal? 
Check collector
voltage(+5V).
No
Q28 fail
7
Page10-11 
File No. SG-0174
Page 24
PDP DISPLAY NOTHING(Composite 2 without screen)
BLOCK 1
Is picture on screen?
No
Check C316,R286,R285
Is there signal?
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
Check:                 
1.C315 (signal AC coupled)
2.R282                 
3.R283(75ohm impedance) 
Is there signal?          
No
Check Q29’s emitter.
Is there signal?
Yes
No
Q13 fail
Yes
No
Check input source
No
Check Q29’s Base.
Is there signal?
Check collector
voltage (+5V).
PDP DISPLAY NOTHING(Composite 2 on PIP without screen)
BLOCK 1
Is picture on screen?
No
Check C316,R284,R285
Is there signal?
Yes
No
Check Q29’s emitter.
Is there signal?
No
Check Q29’s Base.
Is there signal? 
Check collector
voltage (+5V).
No
Q29 fail
No
Q29 fail
Does scaler detect the signal?
CONFIDENTIAL – DO NOT COPY 
Use GProbe connect 
from main to PC.
Check:                 
1.C315 (signal AC coupled)
2.R282                 
3.R283(75ohm impedance) 
Is there signal?          
No
Q10 fail
Yes
No
Check input source
8
Page10-12 
File No. SG-0174
Page 25
PDP DISPLAY NOTHING(S-VIDEO 1 without screen)
BLOCK 1
Is picture on screen?
Is picture color ok?
No
Check C320,R293,R292
Is there signal?
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
Check:                 
1.C319 (signal AC coupled)
2.R297                 
3.R299(75ohm impedance) 
Is there signal?          
No
Check C328,R308,R307
Is there signal?
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
Check:                 
1.C327 (signal AC coupled)
2.R296                 
3.R298(75ohm impedance) 
Is there signal?          
Check Q30’s Base.
No
Check Q30’s emitter.
Is there signal?
Yes
No
Q13 fail
Yes
No
No
Check Q31’s emitter.
Is there signal?
Yes
No
Q13 fail
Yes
No
No
Check input source
No
Check input source
Is there signal? 
Check col lector
voltage(+5V).
Check Q31’s Base.
Is there signal? 
Check col lector
voltage(+5V).
No
Q30 fail
No
Q31 fail
CONFIDENTIAL – DO NOT COPY 
9
Page10-13 
File No. SG-0174
Page 26
PDP DISPLAY NOTHING(S-VIDEO 1 on PIP mode without screen)
BLOCK 1
Is picture on screen?
Is picture color ok?
No
Check C318,R291,R292
Is there signal?
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
Check:                 
1.C319 (signal AC coupled)
2.R297                 
3.R299(75ohm impedance) 
Is there signal?          
No
Check C326,R306,R307
Is there signal?
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
Check:                 
1.C327 (signal AC coupled)
2.R296                 
3.R298(75ohm impedance) 
Is there signal?          
No
Check Q30’s emitter.
Is there signal?
Yes
No
Q10 fail
Yes
No
Check input source
No
Check Q31’s emitter.
Is there signal?
Yes
No
Q10 fail
Yes
No
Check input source
No
No
Check Q30’s Base.
Is there signal? 
Check col lector
voltage(+5V).
Check Q31’s Base.
Is there signal? 
Check col lector
voltage(+5V).
No
Q30 fail
No
Q31 fail
CONFIDENTIAL – DO NOT COPY 
10
Page10-14 
File No. SG-0174
Page 27
PDP DISPLAY NOTHING(S-VIDEO 2 without screen)
BLOCK 1
Is picture on screen?
Is picture color ok?
No
Check C332,R316,R320
Is there signal?
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
Check:                 
1.C335 (signal AC coupled)
2.R300                 
3.R302(75ohm impedance) 
Is there signal?          
No
Check C336,R319,R318
Is there signal?
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
Check:                 
1.C333 (signal AC coupled)
2.R301                 
3.R303(75ohm impedance) 
Is there signal?          
No
Check Q33’s emitter.
Is there signal?
Yes
No
U13 fail
Yes
No
Check input source
No
Check Q32’s emitter.
Is there signal?
Yes
No
U13 fail
Yes
No
Check input source
No
No
Check Q33’s Base.
Is there signal? 
Check col lector
voltage(+5V).
Check Q32’s Base.
Is there signal? 
Check col lector
voltage(+5V).
No
Q33 fail
No
Q32 fail
CONFIDENTIAL – DO NOT COPY 
11
Page10-15 
File No. SG-0174
Page 28
PDP DISPLAY NOTHING(S-VIDEO 2 on PIP mode without screen)
BLOCK 1
Is picture on screen?
Is picture color ok?
No
Check C331,R313,R320
Is there signal?
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
Check:                 
1.C335 (signal AC coupled)
2.R300                 
3.R302(75ohm impedance) 
Is there signal?          
No
Check C334,R317,R318
Is there signal?
Use GProbe connect 
from main to PC.
Does scaler detect the signal?
Check:                 
1.C333 (signal AC coupled)
2.R301                 
3.R303(75ohm impedance) 
Is there signal?          
Check Q33’s Base.
No
Check Q33’s emitter.
Is there signal?
Yes
No
U10 fail
Yes
No
No
Check Q32’s emitter.
Is there signal?
Yes
No
U10 fail
Yes
No
No
Check input source
No
Check input source
Is there signal? 
Check coll ector
voltage(+5V).
Check Q32’s Base.
Is there signal? 
Check coll ector
voltage(+5V).
No
Q33 fail
No
Q32 fail
CONFIDENTIAL – DO NOT COPY 
12
Page10-16 
File No. SG-0174
Page 29
PDP DISPLAY NOTHING(Digital 2 U35 with PORT B without screen)
BLOCK 1
No
Is picture on screen?
Check input source?
Yes
Is picture on screen?
Is picture color ok?
No
No
Check U37 I2C bus
SCLÎ Pin 6 
SDAÎ pin 5
Check U35 pin 90 Î  high
V syncÎR419  
H syncÎR420 
clockÎ R421
Check Q44
sourceÎ high(3.3V)
Check U35 I2C busÎ 
CSDAÎ pin 39 
CSCLÎ pin 40
Check U35 all power  U35 fail
Check U35’s RGB data bus
BÎ RP10,RP11 
GÎ RP12,RP14 
RÎ RP16,RP17
No
No
No
Yes
No
Yes
Yes
Check U37 power
5VÎ Pin 8
Check +3.3V_SWÎ 
FB19,FB20,FB21,FB22
U41Î +1.8V_HDMI1
Yes
Check Q44
GataÎ high(5V)
I2C addr.ÎR424 
No
No
No
Yes
Q44 fail
Check Block 2
Check D66 and D65
Are there 5V output?
Check crystalÎ 
Y2=28.322MHz
No
D66 fail
or
D65 fail
CONFIDENTIAL – DO NOT COPY 
14
Page10-17 
File No. SG-0174
Page 30
Block 2
start
HDMI’s chip 
communicate with
SM5964,is ok?
No
Check U38’s powerÎ 
Pin 44,35
Yes
Check Y3Î 
11.0592MHz
Yes
Check U38’s UART
TxDÎ pin 13
RxDÎpin 11 
No
No
Check U2’s +5V_SW
Î pin 7,8
Check U20Î 
pin 16Î+5V 
Pin 10Î output select=high
Check R143,R144
Yes
No
U20 fail
No
U13 fail
CONFIDENTIAL – DO NOT COPY 
15
Page10-18 
File No. SG-0174
Page 31
TROUBLE OF  DDC READING  
Start
Analog DDC OK?
Yes
Digital HDMI1 DDC OK?
Yes
Digital HDMI2 DDC OK?
Support DDC2B            
No
1.Analog cable ok?         
2.Voltage of +5V_BUF ok?   
3.Check U21              
4.Is compliant protocol?      
Support DDC2B             
No
1.HDMI cable ok?           
2.Voltage of VCC5_E2P_2ok?
3.Check U44               
4.Is compliant protocol?      
Support DDC2B             
No
1.HDMI cable ok?           
2.Voltage of VCC5_E2P_1 ok?
3.Check U37               
4.Is compliant protocol?      
End
CONFIDENTIAL – DO NOT COPY 
Page10-19 
File No. SG-0174
Page 32
Page 33
Page 34