SOURCE: My LG 42" flat screen TV has sound, but no
Hello
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From what you described either the screen driver has failed or the backlight has.
If you get a bright torch and shine it close to screen, you may be able to see a very dark picture.
If you can its the screen backlight that has failed.
Either way you will have to take it be be repaired but you may find the cost rather high and will have to decide if it is worth it or to get a new TV.
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.
SOURCE: where can I purchase a
Check to see if the power cord input on the TV has the same plug shape as the one that fits into your computer tower or monitor. Many modern TVs use the same standard power cord as a desktop PC or monitor.
If it does use the same cord, then you should easily be able to find a replacement cord for a couple dollars at most since that is such a common item. You or someone you know may even have a spare one lying around leftover from an old computer system.
Good luck.
SOURCE: 32''lg flat screen tv not switching on
First guess would be the power supply, if that does not work then your signal board.
You can get get parts for this tv at www.interliquidparts.com
SOURCE: Manufactures unlock code for LG tv. Model 26lg
Contact LG for this information and have that model number handy.
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