Thanks, I will resolder all the joints on the cold side when I get back from holiday, and let you know how it goes !

Hi, not given up on this.

i have found the tv sometimes starts up when I reconnect the main board. I have to poke and push at points on the power board, and eventually the tv turns on. The points are never the same, which is annoying. It tends to be on the cold side, but I can see the board flexing, so it may be something distant. It will stay on, even if I keep pressing components on the power board. If I turn the tv off then on, the tv goes into clicking relay cycles again. If I press the remote to turn off/standby then the TV goes back into clicking relay cycles again.
...

I retested the capacitors by measuring the resistance as above. All were ok. Phoned up a retired TV engineer who used to work near me, and he said he had zero success fixing that sort of fault. Currently it is in the boot of the car, as I had to clear the dining room table for guests at the weekend. I will get it out as the time it did work it had been in a cold room for a couple of months. Still would like to work out if the backlights are sending an error back to the power board or if it is the power board. There was a russian article on this TV on this forum somewhere I will search for.

I've checked for continuity on all the transformers and reflowed the joints, and all were fine. I don't have the mainboard connected, so the backlights should come on and stay on if there is not a problem with the power board or backlights.

What is the normal behaviour with the mainboard and backlights disconnected ? Should the relay still cycle clicking on and off (on for a fraction of a second, then off) ?

Thanks for the suggestions by the way.

Tested Loon, and continuity between all wires at each end

Hi,

First post...

I have this TV, which was working, then suddenly would not turn on. It would get the clicking relay then flash up the screen for less than a second, off for a second then on again. Removing the plug the relay continues to click on and off for a few cycles, which I don't think it did before.

Left it a few months, then finally got round to taking the back off, and it worked as it should. So I tested various bits and all was well. Then turned it on again, and back to the clicking relay.

I disconnected the main board from the power...

Hi,

New to the forum. My training is medical and scientific, which means I ended up doing a lot of reading to learn my craft. Always been interested in electronics, but the internet and youtube has been the catalyst for my midlife crisis. Ended up fixing a lot of things over the last few years, mainly audio amplifiers and tuners, but also the occasional shredder.

Came to this forum with a problem with and LED TV cycling (Samsung [B]Power Supply BN44-00622B)[/B]​, and was reading through the threads covering the same model. Will post up the white surrender flag when...