Question about LG 55" 5700 Series LED HDTV - 55LN5700

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55" LG LED television screen went dark

Screen went dark. Now only flashes once when you turn it on and then goes dark again.

Posted by Charles McInnis on

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The Knight

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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.

Posted on Aug 17, 2016

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So i ordered a new power supply board for my LG 55la7400 television set...part was a perfect match..it went on smoothly with no issues whatsoever. Still just comes on and then black screen


Is it the same as it was before? If so You may have replaced the wrong board, but chances are if tv has a back light it's the problem. It would prob. be cheaper to have a tech. fix it the long run. You might try youtube videos they might help solve your problem. With electronics today their cheap & they don't last long.

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My LED tv screen is dimmed on the right 1/3. After some use it eventually goes totally black?


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/
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.

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1 Answer

Screen flashes once, then goes dark. Power button does not work.


Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

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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/

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-You have a bad panel. Led arrays internal to the panel are defective. Replacement cost exceeds economical repair.

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