Vizio VP50HDTV10A Service Manual page 28

PDP DISPLAY NOTHING(Analog HD2 without Pb signal)
BLOCK 1
Is no blue color on screen?
PDP DISPLAY NOTHING(Analog HD2 without Pr signal)
BLOCK 1
Is no red color on screen?
PDP DISPLAY NOTHING(Analog HD2 on PIP mode without Y signal)
BLOCK 1
Is picture on screen?
CONFIDENTIAL – DO NOT COPY
No
Check component 2
(Pb signal) C260,R197
Is there sync?
Yes
No
Use GProbe connect
from main to PC.
Does scaler detect the signal?
No
Check component 2
(Pr signal) C254,R192
Is there signal?
Yes
No
Use GProbe connect
from main to PC.
Does scaler detect the signal?
No
Check component 2
(Y signal) C287,R212
Is there sync?
Yes
No
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Check U23
outnput pin 28
No
Input pin 15
Input clamp voltage pin 5(+5V)
Output clamp voltage pin 29(+5V)
VCC3 pin 22,23(+5V)
Input_switch_select high(+5V)
Yes
Check before U23's circuit
U13 fail
1.C268,C269(AC coupled)
2.R211
3.R217(75ohm)
Check U23
outnput pin 34
No
Input pin 11
Input clamp voltage pin 1(+5V)
Output clamp voltage pin 35(+5V)
VCC3 pin 22,23(+5V)
Input_switch_select high(+5V)
Yes
Check before U23's circuit
U13 fail
1.C256,C261(AC coupled)
2.R215
3.R218(75ohm)
Check U24
outnput pin 31
No
No
Input pin 13
Input clamp voltage pin 3(+5V)
Output clamp voltage pin 32(+5V)
VCC3 pin 22,23(+5V)
Input_switch_select high(+5V)
Yes
Check before U24's circuit
U10 fail
1.C282,C285(AC coupled)
2.R209
3.R216(75ohm)
No
U23 fail
No
Input source fail
No
U23 fail
No
Input source fail
U24 fail
No
Input source fail
4
File No. SG-0219
Page 9-9