Question about LG 42LG30 42 in. LCD HDTV

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TV wont turn on sometimes. push the on button, light turns from red to blue but no display or sound. If I disconnect the power cord for 15-20 min and plug it back in to the tv it will turn on and stay

Power light is on and turns from red to blue when pushed. no picture or sound not even input screen comes up. screen stays black does not turn blue like it does when it does work. If I disconnect power cord from TV for 15-20 mins, then plug it back in. The TV will then turn on. If you plug it back in sooner then 15min it will not work.

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My Samsung started doing that and it got worst and worst. Searched the web and find answer. It was the high voltage circuit. All TVs now are like computer and it check for 390 to 400 volts and if it is below, the TV will not turn on. Good thing the Samsung has only one capacitor showing the high voltage circuit. Measure the voltage was 381 volts. The capacitor was rated at 100 uf at 450 volts. From some old TV and power supply, got two capacitors rated 150 uf and 220 uf both at 400 volts. Had to connect them in parallel and took out the old capacitor. Now, my TV works fine.

Posted on Nov 03, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

Hi there,
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Posted on Jan 02, 2017

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SOURCE: Lg tv will not turn on, red light

i think your bulb is shot must be replaced

Posted on Apr 29, 2008

  • 187 Answers

SOURCE: stand by light stays on only black screen

mainboard damaged.

replace the mainboard and that should solve your problem.

Posted on May 27, 2009

  • 8457 Answers

SOURCE: when i turn it on it wont stay on, no picture or

Power supply board is dead.Must replaced to solved this problems.Tries Shopjimmy.com,Ebay.com for the power supply board part.

Posted on Jan 23, 2010

  • 8457 Answers

SOURCE: Tv turns on green light blinks three times then TV turns off

Ur power supply board is dead.Tries websites Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

Posted on Apr 07, 2010

Highdefjeff
  • 124 Answers

SOURCE: I have an LG 42lg50 TV that was working fine

An electrical pulse from the thunderstorm has affected your TV. (Was it on a surge protector?)

There is a small possibility that it will come back.

Unplug the television and let it sit for an hour or more and then re-plug it.

If you need to get a new TV, also get a good surge protector such as Panamax.

Posted on Jun 14, 2010

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