Vizio VP50HDTV10A Service Manual page 33

PDP DISPLAY NOTHING(S-VIDEO 1 without screen)
BLOCK 1
Is picture on screen?
Is picture color ok?
CONFIDENTIAL – DO NOT COPY
No No
Check C320,R293,R292
Is there signal?
Yes
No
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
Check:
1.C319 (signal AC coupled)
2.R297
3.R299(75ohm impedance)
Is there signal?
No No
Check C328,R308,R307
Is there signal?
Yes
No
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
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?
Is there signal? Check collector
voltage(+5V).
Q13 fail
No
Check input source
Check Q31's Base.
No
Check Q31's emitter.
Is there signal?
Is there signal? Check collector
voltage(+5V).
Q13 fail
No
Check input source
No
Q30 fail
No
Q31 fail
9
Page 9-14
File No. SG-0219