Hitachi 42PD8900TA Service Manual page 41

[PW3 Sound Circuit]
No sound of TV (Main)
Are waveforms at
pin 2,4,5,6 of PAF1?
No
Are waveforms at
pin 45,47 of PFM1(L,R)?
No
Are waveforms at
pin 43,45 of I201(L,R)?
No
Are waveforms at
pin 31,30 of IN01(L,R)?
No
Is waveform at
pin 2 of XN01?
No
Is waveform at
pin 14 of U101?
No
Check U101
42PD8900TA
Yes
Check
SOUND PWB
Yes
Check
FC PWB
Yes
Check around
PMF1
Yes
Check around
I201
Yes
Check around
IN01
Yes
Check around
XN01
No sound of TV (Sub)
Are waveforms at
pin 2,4,5,6 of PAF1?
No
Are waveforms at
pin 45,47 of PFM1(L,R)?
No
Are waveforms at
pin 43,45 of I201(L,R)?
No
Are waveforms at
pin 13,3 of I203(L,R)?
No
Is waveform at
pin 13 of U102?
No
Check U102
41
Yes
Check
SOUND PWB
Yes
Check
FC PWB
Yes
Check around
PMF1
Yes
Check around
I201
Yes
Check around
I203