Question about LG 55LN5710 55" LED TV 1920x1080, 120 Hz, HDTV
First, it stayed on for about 20 minutes. Turning unit off/on fixed it. Now it goes black after 1 second. Audio remains on the whole time. What's the best way to diagnose what has failed?
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.
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.
Posted on May 16, 2016
THIS set uses 2 boards inside--one drives the left and the other the right side of the screen.
You have to id which is which (GOOGLE?) AND replace it-every brand has different names for these but it sounds like your problem
Some research (you or me) should give a board breakdown for this model---not looking for main or power board but another like sustain etc. and there will be 2 listed (for right and the left sides)
Posted on Mar 25, 2012
SOURCE: Hello! My TV only shows picture for less than a second, then the screen goes black again. It's like a flashing. I replaced the led driver board. Bad Tcon? It has an LG Panel, LC500DUE SF R1 thanks!
It sounds to be a main digital board fault. Contact any service technician to make it confirm; before replacing the same.
Posted on Dec 24, 2015
If it was the LEDs, then you should still have some working. My first thought would be the LED driver circuits.
Best of luck.
Posted on Feb 23, 2016
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