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Samsung TV UE55F7090 clicks permanently

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I have a problem with my Samsung TV.

Error description:

The power supply unit clicks when I switch it on. Background lighting comes on for about 1 second and then goes off again.

Everything has been checked:

LED strips from the lighting are ok. have removed and tested them.

I have already replaced many electrolytic capacitors with new ones.

Disconnected the mainboard flex cable. same error.

Disconnected both plugs for the background lighting.
nothing has changed.

I can't find a suitable circuit diagram either

Power supply unit: BN44-00633B


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