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Lg tv model # 42lh40-ua it popped and has no power ,lights at all, no red light nothing. how can i fix it myself ?

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The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

Posted on Apr 26, 2017

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Posted on Jan 02, 2017

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I have a LG TV model 60LN5400-UA. I attempted to turn on my TV and the red light on the bottom blinked red but there was no picture. Your help would be greatly appreciated.


hi the tv is stuck in standby, it's a power supply fault, capacitors could cause this also a mainboard fault could cause this, thanks

shaun

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Plasma TV LG 50PX950-UA image flashing


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://electro-medical.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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1 Answer

New to this site! Hope someone has an answer that can help... I have a LG 55 LCD flat screen model 55LD520-UA. Try to turn it on. Bottom light blinks red 3 times blinks blue once, then nothing.


Hi,
Try to change the capacitors first. Normally lost of lcd tv have problems with the capacitors and which lead to powers problems. May you will not find visually that the capacitor is fault. So go for changing the capacitor also check the following video. Which will help you understand how to check the power supply broad. Also take care while working with the power board there is a risk or electric shock Also one of the capacitor in the power supply holds charge even when you have remove the power supply.
Testing LCD TV Power Supply BoardsSTEP BY STEP

www.electro-medical.blogspot.com

Oct 30, 2015 | LG Televison & Video

1 Answer

OK.. it seems i'm not having a lot of luck with TV's these days.. i have a LG 60PS60-UA plasma TV that won't power on. when I do i get a red light where the white light normally is when working corre


Hi, It also could be the inverter board(s) that have gone bad. Check them out. If the inverter board goes it will also turn the TV off.
These boards are on the left and right sides of the TV pannel.
Good Luck with your repairs.

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The red light means it's on standby mode but if you wish to turn off the red light you can just go to menu >option>power then choose standby light off.

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1 Answer

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