Hitachi 42PD9700C Service Manual page 46

[PW3 Sound Circuit]
Check SOUND PCB
Are waveforms at
pin 1,2,4,5 of PAS1and
pin 1,2,5,6 of PAS2?
No
Are waveforms at
pin 34,35,38,39,46,47,
50,51 of I401?
No
Is voltage at
pin 10,20 of I401
(RESET-N="H")?
No
Are waveforms at
pin 40 47 of I404?
No
Are waveforms at
pin 24,25,26,27,31,63
of I404?
No
Is waveform at
pin 30 of I405?
No
Are waveforms at
pin 1,9,12,13,14,38
of I405?
No
Are waveforms at
pin 4,8,10 of I406?
No
Are waveforms at
pin 1,5,13 of I406?
No
Check around
I406
42PD9700 & 55PD9700
Yes
Check around
SPEAKER UNIT
Yes
Check around
PAS1,PAS2
Yes
Check
I401
Yes
Check around
I401
Yes
Check I404
Yes
Check around
I404
Yes
Check I405
Yes
Check around
I405
Yes
Check I406
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