[TechAssist] Re: Compaq 19" LCD monitor Mod.TFT8000
- From: "J Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 6 Jun 2005 11:22:53 -0400
Check www.jkllamps.com. They make a lot of the tubes and ballasts. Digi-Key
is one of their distributors. The tubes are run from high frequency AC
generated by the ballast. Sometimes one of the cathodes starts to
deteriorate. You see that in ordinary fluorescents as a darkening at one
end. When that happens, the lamp does not strike at the same voltage on both
polarities so it acts as somewhat of a rectifier and that screws up the
ballast transformer, which then overheats. Sometimes it is damaged and
sometimes it is not.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
Fax/Phone 864 232 3889
mail to: greentron@xxxxxxx
----- Original Message -----
From: <fremur01@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, June 05, 2005 11:33 PM
Subject: [TechAssist] Re: Compaq 19" LCD monitor Mod.TFT8000
> Pete,
>
> I just did the flashlight test on the DELL 17" as
> Jerry
> recommended. Sure enough I can see the image minus the
> backlight.
>
> I guess now it's just a matter of locating a parts
> vendor. I believe Sony makes the displays for DELL,
> will tear into this unit later this week.
>
>
> Fred
> MTS Electronics
> fremur01@xxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of
> majorthom@xxxxxxxxxxxxx
> Sent: Sunday, June 05, 2005 10:36 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Compaq 19" LCD monitor
> Mod.TFT8000
>
>
> Hi there Jerry
> Thanks,yeah the pix is on then off immed.I never did
> what you do and I'll try it
> Take care
> Pete
> Jerome Silverman <greentron@xxxxxxx> wrote:
> When it goes out shine a flashlight on the screen from
> an an angle. If you
> can see an image, it may well be just a backlight
> problem. LCD displays use
> low wattage fluorescent lamps for backlight, and these
> are not as hard on
> ballasts as projection arc lamps.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave Greenville SC 29609
> Fax/Phone 864 232 3889
> greentron@xxxxxxx
>
> ----- Original Message -----
> From:
> To:
> Sent: Saturday, June 04, 2005 6:56 PM
> Subject: [TechAssist] Re: Compaq 19" LCD monitor
> Mod.TFT8000
>
>
> > Pete,
> >
> > I've read information about ballast lamps going bad.
> > The one I'm servicing has a good picture for less
> than
> > 2 seconds then blinks off. Same symptoms when I
> inject
> > a signal from computer vga connector.
> >
> > I've not yet torn too far into it, year of
> manufacture
> > is 2003. Man, these things go bad fast!
> >
> >
> > Fred
> > MTS Electronics
> > fremur01@xxxxxxxxx
> >
> >
> >
> > Hello there -Dont know your name,but mine shuts down
> > too fast to tell.To answer your question,the flouro
> > tubes age & draw too much current causing shutdown @
> > convertor ps.
> > So,with that,maybe isolate tubes,scope the waveforms
> > etc.Highest failures I see are the tubes,bad sm
> > electrolytics all over the place[main bd/convertor]
> > FYI Site bylaws dictate you have a sigfile.I didn't
> > even know what that was when I joined.Everyone is
> > pretty helpful here.Regards,
> > Pete
> > "fremur01@xxxxxxxxx" wrote:
> > Pete,
> >
> > I have a similar problem with a DELL 17" LCD in for
> > service. Does this Compaq you're working on also
> show
> > OSD or self test mode?
> >
> > I wonder if these units develop backlight problems
> > prematurely. My experience is that HP will not sell
> > service literature on their monitors.
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of
> > majorthom@xxxxxxxxxxxxx
> > Sent: Saturday, June 04, 2005 4:31 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Compaq 19" LCD monitor
> > Mod.TFT8000
> >
> >
> > Comes on then blinks right out.Scoped anodes of the
> Hi
> > V xfmr drivers and saw great swings but just hash.
> HP
> > doesn't address the Hi V ps on the parts site.Anyone
> > know where I can find one.Anyone worked on this guy?
> > Regards,
> > Pete
> > Austin,TX 78756
>
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