Philips 50HFL3683S/F7 Service Manual page 27

[Audio Signal Section]
FLOW CHART NO.1
Audio is not output normally.
Yes
Yes
Yes
No
See FLOW CHART NO.5 <AMP+24V is not output.
[Power Supply Section]>
No
See FLOW CHART NO.8 <AL+3.3V is not output.
[Power Supply Section]>
No
Replace Digital Main CBA Unit.
9-4 A21UZ_TR