Question about Philips 42 in. Plasma TV

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I have a 42" legend tv with power supply board 667-ps42d8-20, all capacitors look good but i know one or more are shot. Have you ever dealt with this tv and power supply

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I just inherited the same tv from my girlfriends parents. They say they heard a loud pop and the screen went black. When I turn the tv on I hear a strange noise coming from the power supply board. It sounds like it is coming from one of the yellow capacitors (sorry if there not capacitors new to tinkering). I have read that it could be the y sus board but I feel like its the power supply board. If you have found any solutions please help me out. Thanks

Posted on Nov 15, 2011

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Have a 2 year old sanyo 42 inch flat screen ,power light comes on and click back off then keep clicking on and off


Hi, welcome to Fixya!

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.

Good luck.

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Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

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Checking the power supply board,that the board,where the power a/c cord plug into it.Could be dying to be dead capacitors parts.Check the power supply board carefully,look for capacitors parts are bulging or puffing up on it tops.U have all the tools and know basic eclectronic also can do basic soldering.Replaced all these dying to be dead capacitors parts,will solved this problems.Or try website like Ebay.com,to buy a whole refurbish power supply board for the replacement.

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Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
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Take the tv aparts.Power supply board have these dying leakage gases parts call capacitors.The power supply board,that the board where the power a/c cord plug into it.U know basic's electronic,have tools and know basic soldering?Searches the power supply board,and it supporting boards,look for those dying parts call capacitors it have gases leakages,alway bulges up on tops or puff up on it tops.Replaced these dying to be dead capacitors,the tv power will be stable in ur tv again and work.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

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