Hitachi 55PMA550 Service Manual page 34

Trouble of Sub picture
Are waveforms at TP03(H) and
TP04(V) ?
No
Are waveforms at pin 19(H) and
29(V) of I601?
No
Component Input (without 480i/576i)
Are waveforms at pin26 of I601?
No
Check Q606, Q608, Q609,
Q610, etc.
55PMA550/55HDM71 (PW1)
Yes
Check Formatter PWB.
Yes
Check I602
Yes Yes
Check I601
34
/ Component (480i/576i)
Video Input
Are waveforms at pin1(H) and
Pin2 (V) of I601?
No
Are waveforms at pin9 (H) and
pin4 (V) of I502?
No
Check I502,etc.
Yes
Check I602