Service manual

CONFIDENTIAL – DO NOT COPY
Page10-11
File No. SG-0174
7
Check C308,R273,R274
Is there signal?
No
Is picture on screen?
No
PDP DISPLAY NOTHING(Composite 1 on PIP without screen)
BLOCK 1
Check Q28’s emitter.
Is there signal?
No
Check Q28’s Base.
Is there signal?
Check collector
voltage(+5V).
No
Q28 fail
Check:
1.C309 (signal AC coupled)
2.R276
3.R279(75ohm impedance)
Is there signal?
Yes
Yes
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Q10 fail
No
Check input source
No
Check C310,R275,R274
Is there signal?
No
Is picture on screen?
No
PDP DISPLAY NOTHING(Composite 1 without screen)
BLOCK 1
Check Q28’s emitter.
Is there signal?
No
Check Q28’s Base.
Is there signal?
Check collector
voltage(+5V).
No
Q28 fail
Check:
1.C309 (signal AC coupled)
2.R276
3.R279(75ohm impedance)
Is there signal?
Yes
Yes
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Q13 fail
No
Check input source
No