Vizio VP50HDTV10A Service Manual page 87

PDP DISPLAY NOTHING(Composite 1 without screen)
BLOCK 1
Is picture on screen?
PDP DISPLAY NOTHING(Composite 1 on PIP without screen)
BLOCK 1
Is picture on screen?
CONFIDENTIAL – DO NOT COPY
No No
Check C310,R275,R274
Is there signal?
Yes
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
Check:
1.C309 (signal AC coupled)
2.R276
3.R279(75ohm impedance)
Is there signal?
No No
Check C308,R273,R274
Is there signal?
Yes
No
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
Check:
1.C309 (signal AC coupled)
2.R276
3.R279(75ohm impedance)
Is there signal?
Check Q28's Base.
No
Check Q28's emitter. Is there signal?
Is there signal? Check collector
voltage(+5V).
No
Q13 fail
No
Check input source
Check Q28's Base.
No
Check Q28's emitter. Is there signal?
Is there signal? Check collector
voltage(+5V).
Q10 fail
No
Check input source
No
Q28 fail
No
Q28 fail
7
Page 9-12
File No. SG-0219