Hello,
The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to.
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.
Good luck.
Hello,
This is how it works, the components on the power board needs to be tested, if nothing is wrong, then the flyback transformer will be tested, likewise the line transformer and other power related. Therefore the fly back transformer might be the problem after testing the components on the power board and seeing that its not the cause of the problem.
Testing with a meter will determine this. But I believe you don't know about TV repairs, that's why you gave it to a repair tech.
But $200 dollars is quite expensive. Used Fly back transformer should cost about $30 to $45 dollar while a brand new one should cost between $70 to $100.
Take the TV to a local repairer, it should be cheaper there. Try another repair tech.
Good luck again.
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If you don't get anything check for open fuse. If fuse is OK then check for a horizontal transistor that is shorted, located by the fly back transformer.
Yes it is possible that the fly back is not the problem, the horizontal transistor is what turns the fly back on.
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I was told by repair tech that I need new flyback transformer, cost of repair $200. I don't believe it.
Does this mean that the flyback transformer is not the problem?
Thank you, good response.
I'm pleased with the answers.
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