Philips 40PFL4609/F8 - Audio Signal Section Troubleshooting

8-4 PL14.32ATR
[Audio Signal Section]
SP3801, SP3802 or CL3801 may be defective.
Check and replace these parts.
Audio is not output normally.
FLOW CHART NO.1
[TYPE A]
Are the audio signals output to Pin(1, 2, 3, 4) of CN3801?
Replace the Digital Main CBA Unit.
No
Ye s
Is approximately +13V voltage supplied to Pin(15, 16,
17, 18) of CN501?
Is
approximately +
3.3V voltage supplied to Pin(8) of
CN501?
No
No
Ye s
See FLOW CHART NO.7 <AL+3.3V is not output.
[Power Supply Section]>
See FLOW CHART NO.6 <AMP+13V is not output.
[Power Supply Section]>
Ye s
SP3801, SP3802 or CL3801 may be defective.
Check and replace these parts.
Audio is not output normally.
[TYPE B]
Are the audio signals output to Pin(1, 2, 3, 4) of CN3801?
Replace the Digital Main CBA Unit.
No
Ye s
Is approximately +13V voltage supplied to Pin(15, 16,
17, 18) of CN501?
No
See FLOW CHART NO.6 <AMP+13V is not output.
[Power Supply Section]>
Ye s