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My tv will not turn on - Televison & Video

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  • donnapaisley Dec 30, 2010

    i checked my tv model and it is hdtv31L10a. i do not realy understand what i am supposed to do. the tv light to signify it is on is green. now, thetv will not go on and there is a permanentyellow light where the green one ususally is.

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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.

I do not think it 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.

Compliments of the season.

Posted on Dec 30, 2010

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Hi.

If the TV stays completely off, with no led and no sign of life, then the problem is power supply.
In this case use an extension to test the TV using a different wall socket, or test the wallsocket.
If the power cord is fused , then check the fuse built in the power cord.
If that does not fix the problem, then either power cord or internal PSU must be replaced or repaired. The repair must be done by a technician.

If instead the TV is starting, but it stays in stand-by and does not respond to remote or button on chassis, then the TV is in protect (fault) mode because an internal failure has been detected.
In this case the fault is not necessary the PSU. Parts must be tested to find out. The clicking sound is the protection circuit that keeps turning off the PSU to prevent further damage.
If the problem is the PSU, often it is possible to see at a glance that one of the big electrolytic capacitors in PSU board has blown.

General troubleshooting on this article: Why my TV does not start up and remains in... .

This will not help in case there is effectively an internal fault, but can reset the fault mode if the error was prompted because of a temporary problem.

If that does not work, contact the manufacturer at the number listed on the owners manual to get the TV repaired by a licensed technician.


Note if the TV is blinking a number of times, then there is an error code. In that case report the error code and I will tell you more on the problem. I answer within 4 hours.

Regards.

Ginko.

Posted on Dec 29, 2010

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