Hitachi Projection 57F500 TV Startup Problem

Archived from groups: alt.tv.tech.hdtv (More info?)

<joe1@renda.ca> wrote in message
newsine.LNX.4.44.0410141150120.19511-100000@regulus...
>
> Hey all... I've been struggling with a problem, and wonder if anyone else
> has seen this.
>
> I have a new ultravision Hitchi 57" 57F500 projection hdtv TV.
>
> I've been dying from a start-up problem. On power up, I would get a
> completely WHITE image, I would hear the sound of my station, and after a
> few seconds the TV would shutoff. (probably a protection circuit because
> it has detected an improper start-up) It doesn't matter the signal that it
> feed in, if its standard CATV, HDTV component, RCA, or DVI... for that
> matter...
>
> The repair guys, have changed a CRT gun circuit board... The blue one...
> and yet to no resolution... I've noticed, that if you remove the front
> panel, you will see a control-panel with 6 turn dials... 3 of them adject
> the intensity of the CRT guns, and the next 3 do alignments...
>
> If you lower the 3 CRT light/power internsity to a low (almost black)
> level, and start up the set, and wait a few seconds, will get an image...
> and then you can properly adjust those levels to watch TV...
>
> however, on the next long cold-start, you may not be able to start the
> unit again... The symtoms are the same... on startup you get white image
> and you'll hear sound... and it goes off... sometimes trying to turn it on
> again will work... however, not anymore...
>
> Capri Electronics have not been able to understand or fix this problem...
> they have come, unplug one of those CRT boards, and plug it back in, and
> voila the TV works... but if it is closed and left overnight, chances are
> in the morning it will will turn on again... giving the same problem...
>
> any clues? I figure you guys are 1000% precent smarter than those repair
> guys, and I'd rather instruct them what to change, rather than from their
> "guess work"... because my last CRT blue board changed, messed up
> everything... and I had a "blue" haze around all figures on the TV...
> ofcourse this didn't fix anything, and when it failed again, I called them
> in, and had them properly adjust those guns...
>
> please help...

I wouldn't bet on much smarter, but there may be someone with some
experience.

How new is this set? I thought this model had been out a couple of years.
Is it under warranty? Is the servicer a Hitachi ASC? Have they discussed
the problem with a tech at Hitachi? There are some very good people there
who are normally very helpful to techs in the field. What was the reason
for replacing the blue CRT bd?

I know there are some things to watch with respect to IC401, a good place to
be looking for a problem like this. Also there is a mod for micro lockup
and related problems. The servicer should know about these issues.

Leonard