Re: Problem with Electrohome G07- only half picture

Hi Matt,

I would suggest that you recheck the capacitor job you did...I instruct my
staff to make sure the capacitors (particularly the larger ones) are flush
to the board to reduce the risk of breaking traces if the capacitor is
jiggled in normal use/re-installation of board).

I suspect the large cap on the vertical deflection circuit has a cracked
trace or possibly a cold solder joint. I see this every now and then on
boards that had someone elses' work on the capacitors...

John :-#)#

At 10:19 AM 30/07/2003 -0700, Matt Rossiter wrote:

>This morning I took another stab at trying to fix this problem with my
>centipede monitor. This time I decided to unplug the yoke and start tracing
>signals from the yoke connector pins. I still had a hard time finding any
>thing unusual. After about 20 minutes I re-connected the yoke - and
>badda-bing! Out of nowhere I finally got a full picture on my centipede. I
>honestly don't know what fixed the problem. I did take some readings from
>the wires on top of the yoke - so I figure maybe there was a loose
>connection somewhere - but that doesn't seem to make sense why I'd get just
>half a picture. I'm stumped - but at least my Centipede works! (knock on
>wood).
>
>
>Matt
>
>
>
>----- Original Message -----
>From: "Sean McLachlan" <sean@lithoflexo.com>
>To: <rasterlist@vectorlist.org>
>Sent: Monday, July 28, 2003 7:54 AM
>Subject: RE: RASTER: Problem with Electrohome G07- only half picture
>
>
> > You do if the monitor is mounted vertically. ;)
> > I had a G07 that was doing the same thing, and one of the 400 series
> > resistors was burnt open. I don't remember which one, it was so obviously
> > fried I replaced it without much thought. Rogers R420 suggestion rings a
> > bell, though.
> >
> > Sean McLachlan
> > MIS Manager
> > LithoFlexo grafics inc.
> > 801.484.8503
> >
> > -----Original Message-----
> > From: owner-rasterlist@vectorlist.org
> > [mailto:owner-rasterlist@vectorlist.org]On Behalf Of SteveT
> > Sent: Monday, July 28, 2003 8:58 AM
> > To: rasterlist@vectorlist.org
> > Subject: Re: RASTER: Problem with Electrohome G07- only half picture
> >
> >
> > Matt
> > If it displays the right half of the picture top to bottom -you do not
>have
> > a
> > vertical problem.
> >
> > Matt Rossiter wrote:
> >
> > > Hey all,
> > >
> > > I brought home a Centipede that had a dead monitor. I replaced the caps
> > and
> > > installed a new HV unit. It now powers up, but only displays the right
> > half
> > > of the picture with a line running down the middle -looks like a typical
> > xy
> > > failure but on a raster game. So, basically I have a vertical
>deflection
> > > problem.
> > >
> > > Here's what I've done so far...
> > >
> > > 1) Tested the transistors in the vertical output circuit - X401 and
>X402 -
> > > they test fine out of circuit. I believe the signals are good too when
> > > testing in circuit.
> > > 2) FR401 (the fusible resistor) is fine.
> > > 3) Checked the signals on IC 501 and they look good. Swapped in a new
>IC
> > > just to be sure.
> > > 4) Checked other resistors and capacitors within the vertical output
> > > circuit.
> > >
> > > I just can't seem to trace down the problem, but it could be something
> > > simple I'm missing. Has anyone else run into a similar problem?
> > >
> > > Matt
> > >
> >
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Received on Wed Jul 30 14:08:54 2003