Question about Sylvania LD370SS8 37 in. LCD Television

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Tv was working fine,no problems! Then went to turn it on,the green power light came on, on the screen it said Digital tv for a few seconds then the power light went right into the red light(stand by) with a black screen! 1st time this has ever happened! I tried restarting the tv with both the remote and the power button on the side of the tv,but it still went into stand by mode with a black screen!

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  • Sylvania Master
  • 6,993 Answers

Hello,

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.

First, remove the power cord from the wall, wait for about 5mins, then plug it back into the back and turn the TV on. If it still doesn't turn on, press the ch+ or Ch- button on the TV. If this still doesn't help, then it confirms that the TV has developed a power problem.

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 Sep 12, 2011

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Posted on Jan 02, 2017

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