Tevion Tv Led flashing (Vestel)

[johnnyesp97]

Hello!
I have problem with my tv which I'm trying to repair.
It's Tevion(Medion) MD20163 26 inch LCD TV.
It's Vestel with 17mb35-4 motherboard, and 17pw26-4 power supply.

Tv was on, when electricity got gone in my house. When current came back, I tried to turn on tv, but i had no luck.
When I try to turn on TV, LED first turns on, and it's start dimming(I don't know how to describe that) for a second, like it has some voltage drop, and then start to flash every few seconds.

I oppened TV and everything looks ok, there is one a little bulged capacitor on power supply board, but I don't think that that is a problem, but I will change it. I measured voltages and it looks ok, I will do that once more because I didn't tried to measure in moment of dimming led.

I uploaded video to youtube so I can show you my problem.

If you have any suggestions or advice where I can start please post it.
Thanks in advance!

Beeps on the video are not from TV, thats my mother turning on washing machine
https://youtu.be/p0ltVAI5QRs


EDIT: I found a way how to turn on tv. When led is flashing, I need to turn off power switch, and if I turn it on again in right moment(about 2,3 secounds) it doesn't start dimming, and tv turns on like normal... What can be problem

[R_J]

Re: Tevion Tv Led flashing (Vestel)

It could be the small electolytic caps that are bad, They are usually around 10 to 47 uf around 50 volts, The schematic I have lists them as c801, c892
when those caps go bad the power supply has a hard time starting, trying to turn on the tv multiple times will finally charge the caps enough to keep the supply running.
Schematic here: