Question about LG 55LH40 55 in. LCD HDTV

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Whats the purpose for an inverter board on tv panel

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  • martinez_dav
    martinez_dav Feb 05, 2013

    Thanks Berry, that was very helpful and well explained.

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The inverter is what powers the flourescent tube lights (Back Lights) so you can see the screen image. As a LCD panels picture is very very dark it needs the lights behind it for the image to be able to be seen. The inverter is the "power supply" for those backlights.

Posted on Jan 11, 2013

Testimonial: "Thanks Berry, that was very helpful and well explained."

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I have a Polaroid 40gsr3000 40 in lcd tv. sound works no picture. think maybe inverter board. One board in middle of back .one long strip board that runs along bottom of tv. Is this inverter board?


What you have is an led tv . And the inverter for the back light led is there in the main board (mother board.) of the tv. Its no a separate board.
The the Log board you see is the TCON board which drives the led panel.
If you wish replace the inverter the you have to bay new mother board for you tv. In the model you have Almost every thing is integrated to the mother board like power supply ,back light inverter board the cpu section.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/

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Check for 24 volts on the main power supply board at the paired multipin connectors. Black and Red wires. You only need to take one measurement as they all tie to the same track underneath. If you have 24 volts there, look at the inverter board. Check the 8 amp fuses near where the multiwire connector attaches to the inverter board. If they check okay, check the electrolytic capacitors. If they show any singof bulging, replace them with electrolytics capable of handling high ripple current. The ones from Radio Shack are a gamble only because of the way they source their parts- in general purpose applications, those are okay; inverters are not general purpose.

If you do not have 24 volts, check the capacitors for bulging. Flip the board over and look for potentially faulty solder joints- many will look questionable- reflow them and add just a little solder for heat transfer.

If the caps on the inverter failed and the set has several thousands of hours, you might consdier changing the CCFL lamps as well.

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1 Answer

When I turned on the tv this morning it only had audio no video. Their was no menu or screen saver when I pressed the menu or input buttons it looks as if the tv is off but I can hear the audio fine. What...


Tv now turn on,have a flashes of screen backlight,have picture only a few sec. and dies and have audio left only?This problems alway tv are having dead 1 or 2 long LCD inverter boards.These 1 or 2 long LCD inverter boards are dead.These 1 or 2 long LCD inverter boards job are to help the LCD screen panel have a backlight to produced a picture.Tries tv turn on and off a few time,if tv get a stable picture and work,than have a dying tv Tuner signal board,that the board where the incomming broadcasting signal cable plug into it the problems.Instead of those 1 or 2 long LCD inverter baords.Tries websites like Shopjimmy.com,Ebay.com to buy those refurbihes 1 or 2 long LCD inverter boards and also tv Tuner board.

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Ur tv the LCD inverter board it dead.This board it help to get a backlight to ur LCD screen panel go through the Tuner board to produre a picture.Replaced this LCD inverter board u will get ur picture back.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter board for the replacement.It a long board in shape.

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