Question about Hitachi 60UX54B/55K 60" Rear Projection Television
with a reading of 45V the flyback is partially shorted have it replaced.
to be very sure of that remove the horizontal output transistor that starts with letter C X X X X
and the voltage of the flyback will rise.
then check the transistor while it is still out from the circuit board, you'll see it is probably good.
you can check the supply to the video circuits too, at that voltage of 45V it might be about say 90v
200v is normal operating voltage
but when the transistor is disconnected , the supply to the video circuits equals the supply voltage
if the supply to the video circuit is Zero or lower than 45 V try replacing the capacitor that is connected to the diode from the flyback pins
hope this helps, thanks for using Fixya!
Posted on Jul 16, 2009
Check the B+ and B- connections going into the convergence board. If you don't see any obvious signs of melting / eroding then you will need a whole new convergence board for this unit. It is of course possible to replace the convergence board, should only be a few hundred dollars at most. But first check those B+ and B- connections and make sure they are in-tact, if they are though the problem is somewhere deep inside the board, probably impossible to actually fix.
Posted on Jul 15, 2009
Thanks for contacting fixya.
As per the breif description of LED not comming up it is the main switch mode power supply, I would expect the repair to be anywhere from $200 for a fairly simple repair , to $600 for replacing the circuit board.
As far as preventing it from happening in the future: buy a quality surge protector for your electronics and unplug them during electrical storms.
Secondly, dust/heat is a big adversary to electronics. Change the air filter in your house furnace 4 times a year to keep dust to a minumum, and dust your house often. Make sure your electronics have the adequate ventilation that they require in their owners manual.
Finally, sometimes you can do everything right, and there still may be a microscopic defect in the electronic components of your TV. They are impossible to identify until the time of their failure. In this instance there is no way to prevent the problem.
Posted on Jul 15, 2009
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Posted on Jan 02, 2017
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