LG 42PC1D Clicking repeatedly

[tom66]

I have a LG 42PC1D to repair. It is clicking repeatedly.

I thought I would have an easy fix when I noticed that 6 of the 3300u/10V caps had gone bad and one 680u/50V had too, all of them bulging. So I replaced them but still no joy, it continues clicking. ESR test on them showed they had gone to about 1 ohm each apart from one which was still in spec (the 680u measured 0.02 ohms.)

It has similar symptoms to bad capacitors. It will click once every 5 seconds (inrush relay) but sometimes clicks two or three times in a second. I have left it for 20 minutes and heated it up with a hairdryer with no luck to get it to start up. Every so often when it clicks the screen flickers, this tells me the Y-sus is most likely okay. When either Y-sus or Z-sus are disconnected it still clicks and the fuses test okay on those boards.

There are three Samyoung 3300u/10V caps which I didn't replace, I will shortly replace them and will post back here if that fixes the problem. There is also a Samyoung 680u/63V which could be bad so I'll pull that and test it for ESR.

Any hints/tips would be much appreciated.