Re: Help diagnosing problem.

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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