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In Reply to: RE: Trouble shooting help appreciated posted by volunteer on May 29, 2010 at 08:31:25
Does it do it continuously i.e. not just once after turn-on, but every so often on a fairly consistent basis? If it does, I'd get a can of cold spray and (carefully) "poke" around with it in the lamp driver circuitry first, then the main power supply. Don't forget to do any associated connectors, a poorish one could be getting hot and thus getting flakey too. This could be pretty time-consuming if it only goes dark for a few seconds, but at least could possibly isolate it to the board/assembly...which you could then order and replace yourself.
Or you could check online and see what others have found...this is also time-consuming but I have had great luck with it for my RPTV in the past (what looks awful *sometimes* has a simple solution)...you are almost certainly not the first to have that exact problem...try to search as generically (re model #) as possible. An Hitachi tech has likely seen it too, and there are some tech forums where techs help each other and often consumers too.
Follow Ups:
Yes. I swapped the projector bulb with a spare hoping, but not believing, that was the problem. As expected, the problem persists. I have sent an email to Hitachi. I paid $4000, in 2005, for this set. I was hoping to get more service before replacing. It has lasted longer than a 42 inch Philips plasma that failed in less than four years. If my experience is any indication, the days of a TV lasting 10-15 years are gone. Thank you for your suggestions.
Wendell
Unfortunately, I think you're going to be correct re longevity. In some ways, you might expect flat panels should last longer than old CRT displays did, but that hasn't generally been the case so far. Hard to say for sure though, as technological "obsolesence" has been occurring sooner so we often voluntarily replace. In general, it seems people don't keep anything as long as they used to.Why I mentioned the cold spray is it could help detect poor solder joints. I recall reading several years ago that they were having some solder-related problems with displays of all types. This was because they were learning how to implement the new lead-free solder standards/materials properly. Flat panels of such a vintage were particularly susceptible. I was thinking your TV was about the "right" age where this could rear its ugly head, but I really don't know, just a thought... That bulb could suck a fair bit of juice I'd imagine, so a flakey connection (solder or connector) could get quite hot to the point it has a high resistance or even opens so the bulb goes out. While the bulb is out the connection cools due to no/low current through it, and then the connection gets re-made for a while. I am guessing this because it looks like all your circuits and the bulb are working *some of the time*.
Edits: 05/30/10
I believe you are correct. I'm hoping to get another year or so out of it to better justify the initial cost. In 2005, 60 inch flat panels were out of my price range so I bought the LCD RPTV. It has actually been quite enjoyable considering the decision to compromise. Fortunatly, 60 inch panels are now under $2500 and, as you know, it's difficult to go to a smaller screen.
-Wendell
The "problem" with a "small" display, for me, is it screws up my surround soundscape. Too small a display, and you have to put it too close to make HD worthwhile for all the detail etc. Gets in the way of the sound system, which for me is still more important.
And don't tell anybody I said it, but I still think the best compromise size, between pixel size and clarity/detail and edge definition etc., for 1080p panels, is somewhere around 50". It is a fabulous size if you can make it work. I had to go to 60" to make my sound system and preferred sitting location work, not a total bummer though :)
P.S. re the original topic, since it sounds like you may have changed bulbs several times, I would look at any connector involved in that. You *may* have unintentionally loosened one of the connections changing bulbs that first time.
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