Hitachi 55PMA550 Service Manual page 33

Trouble Shooting (Synchronization)
[VIDEO PWB Circuit]
No Sync.
Single picture or Main picture
Are waveform at TP01(H) and
TP02(V) ?
No
Are waveform at pin 16(H) and
28(V) of I601?
No
Component Input (without 480i/576i)
Are waveforms at pin24 of I601?
No
Check Q601, Q603, Q609,
Q610, etc.
55PMA550/55HDM71 (PW1)
Sub picture
Yes
Check Formatter PWB
Yes
Check I602
Yes Yes
Check I601
33
Trouble of Sub picture
/ Component (480i/576i)
Video Input
Are waveforms at pin3(H) and
pin4 (V) of I601?
No
Are waveforms at pin9 (H) and
pin4 (V) of I501?
No
Check I501, etc.
Yes
Check I602