"I have a rarely used Magnavox 15MF400T/37 Series
make sure the Tv is correctly plugged into the wall. You can try
another outlet. If that doesn't work, then your Tv is certainly having a
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.......
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
The value of these capacitors will be different, most
likely they will be somewhere around-820 to 2200uF/25 V( or /10V
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).
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.......
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.
May 15, 2011 |
Televison & Video