Vizio VP50HDTV10A Service Manual page 27

PDP DISPLAY NOTHING(Analog HD1 on PIP mode without Pb signal)
BLOCK 1
Is picture on screen?
PDP DISPLAY NOTHING(Analog HD1 on PIP mode without Pr signal)
BLOCK 1
Is picture on screen?
PDP DISPLAY NOTHING(Analog HD2 without Y signal)
BLOCK 1
Is picture on screen?
CONFIDENTIAL – DO NOT COPY
No No
Check component 1 Trace componect 1 from
(Pb signal) C255
Is there sync?
Yes
No
Use GProbe connect
from main to PC.
Does scaler detect the signal?
No
No
Check component 1
(Pr signal) C255
Is there sync?
Yes
No
Use GProbe connect
from main to PC.
Does scaler detect the signal?
No
Check component 2
(Y signal) C258,R195
Is there sync?
Yes
No
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Input To U10 circuit
Check R200,R198
U10 fail
Trace componect 1 from
Input To U10 circuit
Check R205,R204
U10 fail
Check U23
outnput pin 31
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 U23's circuit
U13 fail
1.C263,C265(AC coupled)
2.R209
3.R216(75ohm)
No
U23 fail
No
Input source fail
File No. SG-0219
3
Page 9-8