Re: Help diagnosing problem.

would these effect an external display?

Patrick

On May 2, 2008, at 11:04 AM, Highcountryrider wrote:

> Sounds like part of the problem might be CRT adjustment.
> Try fiddling with the pots on the CRT board, they often
> get dirty and moving them back and forth a little will clean
> them. Then center four are most likely to be the problem,
> but try them all.
>
> As always, be vary careful of the high voltages around the
> CRT.
>
> If this gets you a clear picture, LISA will probably be complaining
> about the lack of a keyboard.
>
> Bill.
>
> On May 2, 2008, at 3:48 AM, Patnukem wrote:
>
>
> Hi, I have been working on a lisa 2/5 I have had for a while as a
> hobby. I have not touched it in a while and lately I have been in the
> mood to repair it. The condition it is in now is a whole lot better
> then it was when I found it. When the power button is pressed it
> lights up, so does the disk drive light. I also can hear a High pitch
> sound from the power supply, (could be the high voltage circuit for
> the screen I suppose). No video on screen but does seem to display
> short lines on screen in several rows, kind of like
>
> _____ _____ _____ _____ _____
> _____ _____ _____ _____ _____
> _____ _____ _____ _____ _____
> _____ _____ _____ _____ _____
> _____ _____ _____ _____ _____
> _____ _____ _____ _____ _____
>
> and they are moving upward. I have looked in as many documents as I
> could find to pinpoint this and have not done so. today when I was
> looking I noticed that there were some capacitors that looked like
> they were cut from the I/O. I know some are left off on purpose but
> these could have been taken out by the person that owned it before me
> (an artsy type that tore apart computers by the look of it so it would
> not be surprising) I also have no Hard drive for is or keyboard/
> mouse, and I do not know if that will effect it's ability to display.
> (I would not be surprised if I knew at one time and forgot I have put
> this project off for a while)
>
> Thank you all for your help,
> Patrick
>
>
> "When you have got an elephant by the hind leg, and he is trying to
> run away, it's best to let him run." Abraham Lincoln
>
>
>
> >

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