Hitachi 55PD8800TA Service Manual page 45

[PW3 Sound Circuit]
Check FC PWB
Are waveforms at
pin 2,4,5,6,10,11
of PFA ?
No
Are waveforms at
pin 31,32,33
of I600?
No
Are waveforms at
pin 29,38,40 of I600?
No
Are waveforms at
pin 10,11,12 of IC803?
No
Are waveforms at
pin 1,2 of IC803?
No
Are waveforms at
pin 1,14 of IC804?
No
Are waveforms at
pin 6,9 of IC804?
No
Are waveforms at
pin 45,47 of PFM1?
No
Check around
PFM1,PMF1
55PD8800/37LD8800
Yes
Check around
PAF1
Yes
Check around
PFA1
Yes
Check I600
Yes
Check around
I600
Yes
Yes
Check around
IC803
Yes
Check IC804
Yes
Check around
IC804
45
Is waveform at
pin 15 of IC803?
No
Is waveform at
pin 2 of IC802?
No
Is waveforms at
pin 3,6 of IC802?
No
Check X800
Yes
Check IC803
Yes
Check around
IC803
Yes
Check IC802