Re: IBM monitor won't start up - relay keeps tripping
From: Van Gardner (vangard_at_worldnet.att.net)
Date: 07/19/04
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Date: 19 Jul 2004 06:28:32 -0700
You said you "found" a display and it looked like it suffered a "fall"
and now it has a power problem.
When I read this I visualized someone having a display with a power
problem and throwing it (the fall) in a dumpster. Maybe the fall had
nothing to do with the power problem. Last year I found two new
looking Compaq CV535 displays in a dumpster behind a Rent To Buy
store. One had an open 1meg resistor in the screen circuit and the
other had a defective transistor in the red color circuit. They both
are now on my other computer that I use for video editing.
P.S. I don't normally scrounge dumpsters but I was looking for some
cardboard to lay on while doing some plumbing work under my house. It
made my day.
Van Gardner
"Scott M" <spamkiller@elp.rr.com> wrote in message news:<iw4Kc.3698$WP1.1996@fe1.texas.rr.com>...
> Thank you both for your feedback. Upon close inspection of the PCB, I didn't
> find any broken solder joints. I couldn't find any obvious short or open
> circuits either. I did find a FET that has a D-S short. I removed the FET
> and testted it off the board and it still showed a short. If I understand
> correctly, a FET transistor is similar to the bipolar as a bipolar should
> not have any short between E and C. Therefore, this WOULD indicate that the
> FET is fried, correct? I do not understand how a fall would cause that to
> happen, but if it's bad, I'll replace it.
> I've got a few more to test, but all the other transistors and diodes look
> OK as far as my DMM readings go. I'm also doing the best I can to trace the
> power supply circuit with the schematic (which has been somehwat elusive so
> far).
>
> "Scott M" <spamkiller@elp.rr.com> wrote in message
> news:3cpIc.36687$W6.31701@fe2.texas.rr.com...
> > I found an IBM monitor model 6547-00N (chassis CM-1317). I cannot get the
> > unit to start up. It has a relay that keeps clicking on-and-off but there
> is
> > NO VIDEO. The monitor appearently suffered from a fall but there are no
> > visible cracks in the PCB. The monitor has a feature that causes it to
> > de-guass automatically upon power-up and I suspect that the relay that's
> > going on and off has something to do with the de-guass routine. Has anyone
> > ever seen such a problem? My next step is to try and locate a schematic
> for
> > this monitor so I can check test-point voltages and begin tracing the
> > relay's power supply.
> >
> >
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