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Hi, my 42inches polaroid definia lcd tv switches off itself and after a while i have to switch it back on from main board. any idea how can i fix it....

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: LG TV

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

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SOURCE: LCD LG42LC55 TV switching OFF

THIS IS CAUSED BY THE MAINBOARD AND NEEDED TO BE REPLACED.

Posted on Nov 30, 2008

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SOURCE: Philips LCD TV Matchline series keeps switching off!

heating up issue, try unplugging it and if you can clean the dust from within the unit. Try reversing the vacuum and blowing excess dust out.

Posted on Sep 09, 2009

Testimonial: "I will try your solution...sounds logical and may well do the trick. Thank you for taking the time to sending me your advice...much appreciated. CJ"

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SOURCE: If anyone is in need of Polaroid lcd tv parts contact me

usually capacitors are the problem on the TDA03211c power supply. 450v (volts) @ 10uf. change both. beside inverter filters.

Posted on Mar 31, 2010

  • 1 Answer

SOURCE: Sharp Aquos 46in LCD AV Mode switching to Dynamic(fixed) by itsel

Sorry I´cant help you, but I´ve got exact the same problem.
I´m from germany. I searched the german web, but nothing.
Did you have an answer right now?

Posted on May 20, 2010

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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/
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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://electro-medical.blogspot.com/ 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.

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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.
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Possible errors in the main board , it can be due to failure of a solder joint in the set.
Remove the back panel and switch on the TV to work. when the fault appears then the main boarrd can be tapped lightly to see if there is any switch on of the picture. If so the fault is confirmed and you can continue further. Remove the power connection and solder.

Use these tips below for help:

Check for board faults


Tips on Soldering

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I Think NO expert can help this problem because it free answer


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No manual


Here is the link to the manual. You have to register on this site but it is only 3 lines and takes 2 seconds and is totally free.
Enjoy the manual,
Lee

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