Help fixing Panasonic TNPA5808 low voltage issue

[madhushankarox]

I'm trying to fix an old Panasonic LED TV, mainly for educational purposes.

While I was checking voltages on the P-Board I got to know the voltage of the SRV-16V rail is 13.2V (with and without dummy load).

Both 16V and 24V rails are bit lower than specifications. However the 5.3V standby line is good.



I have tested diodes, transistors and some other parts and didn't find any issue. This seems beyond my knowledge.

Please help me to solve this issue. Thanks



PS: Schematics is attached.

[m k]

16V is adjusted, 24V is following.
5V has its own regulator.

You can start checking the reference diode IC7501 and its connections.