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TV was turned on for about 1 hr. There seemed to appear a low voltage surg, lights went dim, but only lasted about 2 sec. The TV would not come on. There is a power light in the front middle and it is lit. Manual switch on the side was unable to turn the unit on. Is there a fuse on the inside that could be the problem? I am capable to do some trouble shooting and soldering. I am requesting if it is worth trying to repair the problem or who do I call? I live in London, Ontario, Canada. I used to repair B&W tv many years ago. 519-642-2931

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  • hbermanmail Jan 02, 2011

    Fantastic !!! I removed the power, waited a minute, plugged it back in and away it went. Thank you, thank you. Harvey Berman

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Hello,

This is an indication that your TV has developed a power problem. Remove its plug from the wall and fix it back into the wall, then turn it on again. If it still does not power on, then the power supply board in the unit is the cause of the problem.

The power supply board might be defective and maybe that's why the unit won't power up. Its receiving power but it cannot transfer the current to the necessary part of the unit because a capacitor, diode, etc may have been faulty. Until these bad components are replaced, the unit might not come on.

This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

I do not think the defective power board needs replacement, rather some defective capacitors are 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.

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.

Posted on Jan 01, 2011

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