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I have a LG 49sm8600 LED TV. Red Light stays on but no video or sound. I have replaced the power board, the main board and the IR sensor PCB. What next?
I have tried all the resets for 60 seconds. Nothing changes.
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Lightning strikes kill all the boards and components, 125.000 volts will do that!! Claim on your household insurance or take it to a repairer who has all the test equipment..
I had the same problem, changed the power board, main board and t con board. I purchased the led light tester, one string of lights was out. Replaced the lights, and 1/2 of the tv worked. I broke the black tab that connects the ribbon connector to the bottom panel. What a learning experience. Now I have to figure out how to change the ribbon connector.
Going to need more information to help much, what do the various power board rails look like?...are they all good?
Going by the fact this set has had a lot of main board failures I'd lean towards that board but its just a guess without knowing some voltage measurements
Try removing the LVDS cable that goes to the Tcon board and see if the set stays on, you won't have picture but does the sound stay on...if it does then replace the Tcon board, the only one you haven't replaced it sounds like
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.
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