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I have a 42 inch lg it starts up perfect after about 20 mins the picture starts flashing then the screen goes black then flashing again can you help

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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://electronicshelponline.blogspot.com/

Posted on Nov 29, 2014

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Posted on Jan 02, 2017

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SOURCE: 42 inch LG Plasma TV - Lost picture

ysus pcb that supplies voltage to the panel is faulty

Posted on Dec 15, 2007

  • 3 Answers

SOURCE: 42 inch LG Plasma TV - Lost picture

Our LG 50" plasma tv screen went black after a popping noise but still had sound, after great diliberations decided to take the back off and have a peek!
We unplugged the tv and tested the fuses (there were three we could see) one had blown, the one on the left as you look at the back of the tv it also has one above it. We wrote the code/seriel number down and took the fuse to the electrical wholesalers Maplin and bought a pack of 10 fuses for £1.29 replaced the fuse in the tv and everything now fine!!!!!!
Hope this might be of use to anyone whose lost the picture after a loud popping/snacking noise but still has sound.

Posted on Jan 17, 2008

  • 103 Answers

SOURCE: samsung hpr4252x perfect picture in

You have a burn in problem from watching widescreen movies.If you have access to a signal generator or tv setup disc run a perfectly white screen on the plasma for about 30 min.This should help even out the pixels on the display.

Posted on Mar 05, 2008

  • 1 Answer

SOURCE: No picture after 20 mins on LG LCD Tv

i have a 32" lg hd flat screen an it now does the same thing i got it on boxing day an its not even 5 months old

Posted on May 15, 2008

  • 155 Answers

SOURCE: Vizio 42", have picture for about 5 mins then screen goes black.

also check the power cord wire coming from the back of the tv is loose from the tv side or perfect.

Posted on Oct 26, 2008

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My tv image goes off while watching tv,I do have audio but no image.


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2 Answers

Vizio 42", have picture for about 5 mins then screen goes black.


also check the power cord wire coming from the back of the tv is loose from the tv side or perfect.

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1 Answer

So i ordered a new power supply board for my LG 55la7400 television set...part was a perfect match..it went on smoothly with no issues whatsoever. Still just comes on and then black screen


Is it the same as it was before? If so You may have replaced the wrong board, but chances are if tv has a back light it's the problem. It would prob. be cheaper to have a tech. fix it the long run. You might try youtube videos they might help solve your problem. With electronics today their cheap & they don't last long.

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I have a lg rp42px11h I fix the vert lines now it flashe every 5 min after is on


You most likely have a problem with the voltage protection circuitry, the screen starts up, the crowbar is somehow activated, and it shuts it down, You need a service manual. Below, below that is a user manual, they have invaluable information, The service manual has troubleshooting and repair info found nowhere else.
http://74.125.155.132/search?q=cache:DmdPzTp_CKIJ:www.shema.ru/0_s/tv_1/goldstar_lg/RT_42PX20_Chassis_RF_043B_Service_manual.pdf+LG+RU-42PX10+service+manual&cd=37&hl=en&ct=clnk&gl=nz



http://www.retrevo.com/support/LG-RU-42PX10-TVs-manual/id/14714ci361/t/2/

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1 Answer

Have LG 42 inch plasma, 1 inch black line down center of screen, picture good other than black line blocking center of screen, comes and goes sometimes


Sounds like the middle scalar board is defective. Since the issue comes and goes it could just be a loose connection to the between the scalar board and the PDP Module (plasma panel).

Great caution needs to be taken when checking this connection because it is a ribbon cable connection it and needs to be put in correctly aligned or it could cause a short in one of the circuit boards.

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1 Answer

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You need to get this tv service asap.i beleive that the problem is in the inverter board or yb board.


good luck

caypianan@yahoo.com

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Try to finde lose connection/ cold solder joint at board attached at end of picture tube. It seems heater/ filament voltage not being supplied to picture tube after a while and picture goes to black.

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Samsung hpr4252x perfect picture in


You have a burn in problem from watching widescreen movies.If you have access to a signal generator or tv setup disc run a perfectly white screen on the plasma for about 30 min.This should help even out the pixels on the display.

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LG LCD Tv picture goes black but the sound still works


Next time it goes dark do a flash light test to see if your inverter board is fubar.

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