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I have a LG tv that won't turn on. the outlet it is plugged into has power.

Posted by Michael P Dentino... on

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ChinthakaJ

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  • Master
  • 943 Answers

Have you checked the power fuse?

Posted on Dec 22, 2019

5 Related Answers

SOURCE: sony tv

do you feel static on the front of the screen (indicating the high voltage is working)? Put your arm in front of the screen when you hit the power button and see if your hairs are being pulled towards the screen.

Posted on Jun 10, 2008

gsalmen

Gino Raymone

  • 77 Answers

SOURCE: lg tv automatically turn on and off. Power surge

the software in the main control is damaged. call your lg servicer in your area. he might get you a software update

Posted on Jul 09, 2009

Anonymous

  • 1 Answer

SOURCE: my lg tv (model number 42LH40) won't turn on

There might be an off on switch under the lower right hand corner of the set. (feel for it) and switch it.

Posted on Feb 13, 2010

Anonymous

  • 160 Answers

SOURCE: SAMSUNG LN52B610

Hello.
If you have multimeter available you can actually check if voltage present at the end of your power cord first.
If it's OK than you have to remove back cover from your TV and locate power supply board. It's very easy - it should be next to the power cord receptacle. First look for capacitors that have bulged tops instead of flat ones. If you locate any - replace them and check if it's going to take care of problem.
Right next to receptacle connection is fuse located and you have to check if it's open. Replace it if needed. If new fuse got blown right away - you have short in power supply board. If fuse is OK - connect power cord and using multimeter try to figure out if 5V is supplied from Power supply board to the main board (the one that have all inputs attached to it). If 5V is present but power LED in front of the TV is still dead - you could have problem with main board.
Best regards.
Russ.

Posted on Aug 17, 2010

SOURCE: I have a 26" flat

Hello,

yes, it could be a power surge,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.

All these can be checked on the power supply board.

But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Regards.

Posted on Jun 07, 2011

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1 Answer

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