A/ V Inspection - Pioneer PDP-42A3HD Service Manual

5

7.1.7 A/ V INSPECTION

A/V Inspection
No Video Output - CVBS/YPbPr
Preliminary Checkpoints
If no video is output while the UI(User Interface)and key controls are normal,
first check the video output signal of CPU.
If no video signal found,check the TS parallel data between CPU and U531.
If no output of TS data,check the U531 and relevant components.
U2(PIN:A9):CVBS
U2(PIN:B9, C9):
S-VHS
JP141(PIN1, 3, 5,):YPbPr
Waveform 9-1 (CVBS)
Waveform 9-2 (YPbPr)
Useful Tips
1. If no output of TS data but tuner is good, check the U531 and relevant components.
< Waveform 9-1 >
T20
5
6
No video Output
OK
Check the Video output
of CPU
OK
Check the TS line between
CPU and U531
OK
Check for other defective
modes
PDP-42A3HD
6
7
NG
Check the path between
CPU and JP705, JP706 (Incorrect
insertion, poor soldering, short
circuits, damage, etc.)
NG
Check the TS signal path from
tuner to U531.
< Waveform 9-2 >
7
8
A
B
C
D
E
F
T20
97
8