My Hitachi 50VS810 quit working with the front panel light showing the cooling fan was not working. I pulled the
rear cover panel and the bulb as well...the bulb appeared ok but the cooling fan for the bulb was stalled out with
massive dust clogging it. I blew the unit out w/ compressed air and counted 5 internal fans (I now believe there are
six or more) and logged the Model #s etc. of most of them. I re-installed the bulb, turned on the set and it would
not light up...? The indicator LED's showing the bulb was bad. I pulled the bulb and it was obviously bad?
I ordered and installed a new bulb/housing assy. All was fine for a while...a couple of weeks that is!
Then When I turned on the tv (cold start up) it would be fuzzy/blurry for a minute or two? This went on for 10
month's or so.
It progessed to a longer and longer period of time before the pic would become normal. Like 10-15 minutes or so by
the end. (untill it started cycling off and on repeatedly).
Then on Thanksgiving 2010 it started shuting off and then turn back on in cycles repeating in an endless loop.
There is a (power inverter?) circuit board which has 2 fair sized caps 680uf/200v which I replaced with same uf and
same brand but a slightly higher 220v rating.
This board has 120AC volts coming in and 330v DC out when the lamp is lit. (340v DC when lamp cycles off---no load).
This is feeding the ballast circuit board. I have replaced the ballast board as well.
The tv will stay on for long periods now but will still cycle off at random.
It is still fuzzy for 12- 15 minutes on cold starts and it starts up fuzzy when it restarts...even though it has had
no apparent time to cool down? I would really like help to fix this tv.
I offered to give it to my mom thinking it was a easy fix...I spoke to soon...now I don't know what to think.