Have you checked the power fuse?
SOURCE: sony tv
do you feel static on the front of the screen (indicating the high voltage is working)? Put your arm in front of the screen when you hit the power button and see if your hairs are being pulled towards the screen.
SOURCE: lg tv automatically turn on and off. Power surge
the software in the main control is damaged. call your lg servicer in your area. he might get you a software update
SOURCE: my lg tv (model number 42LH40) won't turn on
There might be an off on switch under the lower right hand corner of the set. (feel for it) and switch it.
SOURCE: SAMSUNG LN52B610
Hello.
If you have multimeter available you can actually check if voltage present at the end of your power cord first.
If it's OK than you have to remove back cover from your TV and locate power supply board. It's very easy - it should be next to the power cord receptacle. First look for capacitors that have bulged tops instead of flat ones. If you locate any - replace them and check if it's going to take care of problem.
Right next to receptacle connection is fuse located and you have to check if it's open. Replace it if needed. If new fuse got blown right away - you have short in power supply board. If fuse is OK - connect power cord and using multimeter try to figure out if 5V is supplied from Power supply board to the main board (the one that have all inputs attached to it). If 5V is present but power LED in front of the TV is still dead - you could have problem with main board.
Best regards.
Russ.
SOURCE: I have a 26" flat
Hello,
yes, it could be a power surge,
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.
Regards.
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