Question about LG 42LP1D 42 in. LCD HDTV

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My LG 42LP1D Switches on and off with no picture

Once the TV is plugged in, it switches on and then after about 20 seconds, it switches off again. Then, once again, it switches on and then off again. This cycle continues until I unplug it. I have tried using another power cable but its the same story. Any suggestions? JH

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6 Suggested Answers

SOURCE: LG Plasma Monitor MU-422PM11 Red Light Problem

Your unit is in protect mode a short circuit has occured either at x,y z board.Check fuses F52 on y Board,FS1,FS2 on Zboard.Remove P1,P2,P3,P4 if power supply voltage is normal replace right x-board.Remove P6,P7 if the power supply voltage is normal replace left x-board

Posted on Feb 12, 2008

  • 1 Answer


There is probably a bad capacitor on the power board, I had the same thing happen to my 42LB1DR after 2 years. T.V. would turn on and white power light would blink, no pictue and no sound. If your'e a diy'er, it is not that hard of a fix. Take all the covers off of the back of the tv(UNPLUGGED!!!), then look at all the capacitors on the power board. lcd_repair_4_bad_capacitors_lg.jpg
These are the capacitors, look to see if any of them appear to have a bump on the top of them. They are supposed to be flat, you can also tell if one of them has gone bad if there is an oily substance on the metal cover that was removed. If one of them is in question, carefully remove the board, and take it to an electronics store to have them sotter ?sp on a new capacitor. It ended up costing me around $40.00 to have this done. Good luck and if you are not comfortable trying this, than take it to a repair shop, but I was quoted around $450 to take the T.V. in. No Thanks

Posted on Nov 21, 2008

  • 147 Answers

SOURCE: set turns itself on and off with no picture nor sound

You have a major problem with this set. Could be the main board, the Y-SUS board, or the power board or some combination of these.

Posted on Mar 30, 2009

  • 1077 Answers

SOURCE: 42" Plasma Cycles on/off when turning tv on

Most likely the TV has a power supply related problem. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
I can't say it's 100% the problem because I can't actually look at the tv over the internet.
If by chance the TV is still under warranty, go that route.
If not under warranty and If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, test points, and part# lists. Usually, cost under $20.

I hope I shed some light on the subject for you.

Posted on Jun 29, 2009

  • 8457 Answers

SOURCE: Power problems

Power supply board is dead.Replaced the power supply board will solved this problems.Tries websites, to buy a refurbish power supply board for the replacement.

Posted on Apr 01, 2010

  • 453 Answers

SOURCE: TV switches from green light to red light every 20

the problem on ur tv is the power supply if u take the back cover off and look close to the power supply u would some bad capacitors , 3 to 6 bad cap or it can be only one thats way the tv is not working , if u try to replace this bad cap the cost woulbe about $50 with the solder station or u can call a tv repair shop and see how mush cost to replace the bad capacitor on ur power supply but u has to take the power supply from the tv and take it to the repair shop

Posted on Dec 31, 2010

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the unit is having a backlight failure.It is a manufacture defect.Call lg customer service,they are aware of the problem in certain sets.Be persistant.

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