Panasonic TX-50DX700E turns on by itself

[Egidio85]

hi, I have a strange problem with a Panasonic TX-50DX700E TV, it has a TNPA6198 power supply.

the TV initially switched on by itself and responded very late to the volume-change controls etc. both from the remote control and from the TV keys.

now it sporadically turns on if I switch off the power and plug it back in, after a few minutes of operation it emits a strange whistle from the speakers and turns off.

could anyone tell me if it can be a problem of the power supply card or motherboard?

any tips on the components to check?

capacitors and diodes are ok. I am attaching a photo of the voltages from off

thank you

[budwich]

Re: Panasonic TX-50DX700E turns on by itself

if you have the tv connected to hdmi, remove the cable. Also try disconnecting the IR receiver board if possible to see if the problem changes.

[Egidio85]

Re: Panasonic TX-50DX700E turns on by itself

I removed the HDMI cable and the IR receiver but the problem persists. the TV stays on for 1 minute then the image freezes and a whistle sounds from the speakers. after 5 seconds it turns off