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If back-light is OK, the fault will be with its T'Con board. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
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.
you have a capacitor that has a crack in the body of the device, when you turn it on it build up a charge than you hear the crack sound, that the capacitor arcing to a ground point, you mite place in a dark room and watch for the arcing to take place.
Wow so you've spent a lot already. I'd buy a new tv dude. It sound to me like something else has failed on a power board and they just don't replace small parts anymore you need to spend the money to replace the boards usually unless you find an old school TV technician willing to do it. It could be a the power supply so before you try anything costly see if you have a similar power rated supply around the house and see if that is the problem. Good luck. + Google the issue and you may find it to be a simple answer.!
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/
Faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent.
its possible that the repair man lied if it is an rca then call the company and have them send you replacements. of course this will require money but less than a new tv
most times then not it's the capacitors on your power board that blew there for not supplying the tv with enough power if you open it up and check the capacitors it should be leaking some kind of liquid or the tops have bubbled up. its an easy fix cost>>2 dollars each
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