Hitachi P50H401 Service Manual page 58

TROUBLESHOOTING FLOW CHARTS
[Terminal PWB circuit trouble shooting]
No sound, abnormal sound
Are waveforms at
terminals of speaker
OK?
No
Cable/Air, Input 1/2/3/Front
Are waveforms at
pin 1(L) and pin 4(R) of Q002
OK?
No
Input 1/2/3/Front
Are waveforms at
pin 91/89/87/85(L) and
pin 92/90/88/86(R) of I001
OK?
No
Check Input terminal
(For in depth Troubleshooting Flowchart see page 120)
Yes
Check Speaker
HDMI
Yes
Check Main-Digital board
Yes Yes
Check I001
Yes
Check UT01 (Tuner)
57
Cable/Air
Are waveforms at
pin 83(L) and
pin 84(R) of I001
OK?
No
Are waveforms at
pin 9(SDA), 10(SCL) and
voltage at pin 2, 7, 18(+5V)
of UT01 OK?
No
Check IT06, IT07
or Main-Digital board
DW3U