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Tv has sound no picture.when you point a flash light at screen you can see picture I think it's a led driver board that needs to be replaced LG 50 inch tv 50LN5400-UA ????

1 Answer

Electro Med Services

LG Master 6,694 Answers
Posted on Dec 01, 2016

Electro Med Services

LG Master

Joined: Dec 13, 2010

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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...

5 Related Answers

Jay Plesset

2942 Answers
Posted on May 21, 2015

SOURCE: LG px950-ua plasma TV. How do I restore picture and sound?

Before spending more money on boards, measure the voltages that are there. If ok, it's not power supply.

Claude Kayser

9098 Answers
Posted on Jan 18, 2016

SOURCE: LED TV pulsing

How many have 'blinking' issue with Samsung led tv - Forums - CNET

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CNETJan 26, 2011 - I am trying to get the number of people affected by this nagging blinkingissue with the latest Samsung led tv's. If possible it would be useful to ... Samsung LCD TV Screen flickering (LN55C630K1F)
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Antony Cosic

9 Answers
Posted on Jul 02, 2016

SOURCE: I have an lg tv model# 50ln5400-ua there is sound but no picture all black screen... What could be the problem and can i fix it

Main controller board is probably, or it could be the lcd display panel itself.

sonic boom electronics

1557 Answers
Posted on Jul 05, 2016

SOURCE: LG LED TV. Model #50LN5400-UA. While watching tv the picture will randomly go black. I can turn the tv off and back on and it'll start work again. Any help would be greatly appreciated.

Lamp switch is faulty replace the y board

The Knight

76851 Answers
Posted on Sep 20, 2016

SOURCE: Which board cause picture not showing. 50 inch Lf plasma TV. Model # is 50PN4500-UA

Fault at its main digital 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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