Hey,TV died all of sudden and had a tech tell me thinks it needs a power supply . I've fixed monitors and some older TV, so i pulled the back . I ohm'd all the fuses and are good ,also checked all caps and there all good. TV has no pic or sound,green power light lights up and do here a relay click likes it trying to start and then clicks off . I'm suspect the main power supply board ,bur wonder if maybe the relay on this board ?

Please contact the authorized service center for Philips. After replacement of the main board, a firmware update, is necessary. It is a skilled work. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Dear Sir,
It is not a problem power supply this problem is base plz exit IC And clen after re-install IC And proper soldering

Same thing happened to mine and some guys came to look at it, turns out the main board had to be replaced, they say it went because the dust was blocking the cooling fans. I think mine is more modern as when ot went off the power light flashed 8 times, which was a code for what was wrong. See if yours flashes anywhere and look it up.

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

http://elektrotanya.com/lg_50pk750_training_manual.pdf/download.html

U have all the tools and understanding basic electronic and also can do basic soldering?Yes.The tv power supply board,that the board,where the power a/c cord plug into it.Check the whole tv power supply board carefully for dying capacitors components parts.It is usally have bulges or puffing up capacitors parts indication of components capacitors parts are dying and needed replacement.Replacement for those new capacitors component parts with the same Micro ferit and the voltages of those new components capacitors parts in a higher voltages like 5 or 10 voltages higher than the old components capacitors parts u are replacing for a better heat resistance for the tv operation of the tv power supply board for later on tv use.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

If you remove the back you will find a couple of electrolytic caps that need replace, and/or just replace the power supply. That should take care of your problem.

hey yo, i think your problem is quite similar to my problem. Because after I've installed it properly and after 5 hours working the screen suddenly become blank and not detect the connection. I think the mobo already broke down.. T_T

Just fixed mine. Maybe it's a few years late. Hope you guys still have the display. It's the power supply board. I've just replaced 4 bulge capacitors near one edge of the PS. They are 2x1000uF 10V, 1x470uF 25V & 1x470 10V. I salvaged my parts from an old CRT monitor. Hey you can go green with your repairs too!