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Where do I find the part number on the power board for my LG 47LH40

The TV won't power up. Have tried different plug ins and no luck. Had a storm recently that knocked power out. Had the TV and a few other things plugged into surge protector and the TV is only thing that won't work now. Any suggestions?

Posted by Joe Davis on


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The Knight

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  • LG Master
  • 76,763 Answers

You have to contact the authorized service centre for LG, to get an original replacement.

Posted on Jun 28, 2013


5 Related Answers


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SOURCE: My LG 50' plasma tv popped like a firecracker no longer works

You have experienced a plasma eruption. The fix for this may easily surpass the value of the unit - sorry to hear that.

Posted on Apr 04, 2009


Benjamin Patri

  • 3037 Answers

SOURCE: screen went black/won't power on

This is a common problem

The first step is to check the fuse on the power supply board. Next, disconnect the inverter board to eliminate the possibility of it shorting down the main and or power boards. Be careful as the inverter board supplies high voltage to the cold cathode tubes (backlights) and it bites HARD. If you disconnect the inverter and the power led comes up then replace the inverter board. (The screen will appear blank because you have no backlighting). If the power indicator still fails to light you need to suspect the main board first before the powwer supply board. The main board tells the power supply board to come on. You need to check the trigger from the main board to the relays on the power supply board. Also check the power connector to the main board because you should see +12V and/or +5V on at least some of the pins. If no power on the relay triggers then replace logic board. Then replace Power supply board last. Or buy a new monitor!!

Posted on Oct 26, 2008


  • 1 Answer

SOURCE: My TV will not power on at all today. It was

it has (2) 8 amp 250 volt ceramic fuses, slow burn, 5mm x 20mm that needs to be replaced. they cost about $1.00 - $3.00 each. Just take off the back cover (make notes of where the 4 different types of screws go!!!) and look just above where the plug goes into the tv. A set of needlenose pliers will easily remove the fuses.

Posted on Dec 03, 2009


Bud Martin

  • 11361 Answers

SOURCE: My Sanyo DP32648 was plugged into a surge

If you look at the power supply board as shown in the picture:

There is a main fuse on the top left of the board covered by black shrink tubing, SLO-BLO 4A 250V. Check it out to see if it is blown.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:


Please post back what you find.

Posted on Jul 27, 2010


  • 40 Answers

SOURCE: I have a Samsung TV, model number LN52A650A1FXZA.

Bad caps in power supply. Call Samsung immediately. They are covering many of these on 1-time courtesy repair.

Posted on Sep 28, 2010

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Related Questions:


I have a lg 47lh40 have sound but no picture

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...

Lg 47lh40

Check its connection between LCD pane and T'con board for any loose contact.

LG 17LX1R flashing red LED - TV won't power up

Try changing the input device to something you are sure, works such as a DVD player.

Switch off TV manually, switch off power, remove plug and retry after 48 hours.

If problem persists, please refer it to a qualified service technician.

I've had several power cuts lately , now my tv is

Hello rogerstanila,
if you have tried unplugging it for a while and if there is still no change then it could be your main board. Unfortunately to fix this could be costly. See if you can find a repair tech that will do a diagnosis for free. But there has quite a bit of problem LG tv's being stuck on standby especially the LCD tv's, Other than this there is not much you can, maybe changing the battery of the remote and just keep trying to click on and off. If it is plugged into a cable box, try unplugging all of that for a while. Leaving it unplugged for a day won't hurt. If nothing else then it could be your main board. You could replace it but as I said before it could you couple hundred dollars. Hope this some what helps.

My Kenmark 19" tv won't


The power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like, to buy a whole refurbish power supply board for the replacement.

Hope this will help in solving the problem, do take in handling the fault, because it contains high voltage..
Good luck

When I plug in my tv it makes a clicking sound like it wants to turn on but it can't. After i plug it in it won't turn on after I press the power button

Sounds like a deffinate power supply issue, if you open the TV, there is likely a bulging capacitor on the power supply. Even if not a obvious capacitor problem, the Power board is likely the culprit.

Can buy new one on many websites, or used on ebay.
make sure you buy based on the part # listed on the board, and not by the model number of your TV, as there are usually many sub-models that all have different interior parts, and most are not capatable with eachother.

I have a LG 47LH40-ua LCD tv. Today after watching TV for a while the picture started to fade to white. Turned to a different input and it was still faded. Turned the tv off for a while and the picture...

good day

that problem is many causes its either power supply loose connectors or the worst is the main got partially defects..I give you some tips to fix that any of 3 causes that mention above..

first causes,,the power supply,,its gives the supply of all the system of the unit..when it is not functioning well or the output supply is two low or high.. Also your TV is not function well..
step to troubleshoot;
1) remove the cover by unscrewing of all screw at the back side of your TV
2) check the output voltage such as 5v,24vdc..By power on again and use a multimeter tester range it to DC..if there's a voltage drop..
3) check if there's a leak or bulging top capacitor..if any leak capacitor replace it

like this

Next causes,the loose connectors..

1)reset the all connectors that you see inside your TV by disconnecting it and connecting it again

Next causes is the main board,,there's no easy remedy of that instead of resetting the power such as off/on

thank you and good luck

I just bought an open box lg 47lh40. The TV remains on for about 15 minutes then begins to turn itself off and on. Any suggestions?

This is a circuit board issue. Your going to have to call LG and find someplace to have it fixed under warranty. Open box items cannot be returned so LG will give you someplace around your area to bring it for the repair.

My LG 47LH40 does not power on light at the bottom is off. What can I do it was bought last November

I just came across this problem. I called in, and they said there was a power switch right beneath the light on the bottom right edge of the tv. So I decided to look down there and it was switched to off. Switched to on and that was the problem. I didn't even know there was a button there, but apparently one of my friends turned it off while he was drunk.
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