Vizio P50HDTV10A 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?
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No No
Check component 1 Trace componect 1 from
(Pb signal) C255 Input To U10 circuit
Is there sync? Check R200,R198
Yes
No
Use GProbe connect
from main to PC. U10 fail
Does scaler detect the signal?
No
No
Check component 1 Trace componect 1 from
(Pr signal) C255 Input To U10 circuit
Is there sync? Check R205,R204
Yes
No
Use GProbe connect
from main to PC. U10 fail
Does scaler detect the signal?
No No
Check component 2
(Y signal) C258,R195
Is there sync?
Yes
No
Use GProbe connect
from main to PC. U13 fail
Does scaler detect the signal?
Check U23
outnput pin 31
No
Input pin 13
U23 fail
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
1.C263,C265(AC coupled)
2.R209
3.R216(75ohm)
No
Input source fail
3
Page 9-8
File No. SG-0219