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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: cv643d on February 12, 2009, 07:24:16 PM

Title: Unexpanded A3000 with flickering display
Post by: cv643d on February 12, 2009, 07:24:16 PM

Hello,

I got hold of a basic unexpanded A3000 with 2MB+SCSI HD's yesterday.

The display is very unstable, flickering a lot (on its own and when I touch the mouse), also small graphics artifacts are left on the screen after mouse pointers and WB-windows.

where should I begin looking for a fix? It has had some battery damage since the battery was not removed and a couple of 74* chips and some resistors have green goo on them, the Paula was attacked too on one leg. The graphics chip is in fine condition though.

Any ideas?

Title: Re: Unexpanded A3000 with flickering display
Post by: Prime on February 12, 2009, 07:39:55 PM

Which display is flickering?

The Commodore side or the VGA side?

Joe

Title: Re: Unexpanded A3000 with flickering display
Post by: cv643d on February 12, 2009, 07:43:50 PM

Actually I have just tried the Amber VGA side.

Maybe I should try it on my TV too. But I believe the Commodore side is broken too (if I understood the seller right).

Title: Re: Unexpanded A3000 with flickering display
Post by: glitch on February 12, 2009, 08:37:08 PM

Have you adjusted the little tiny potentiometer beside the 15 pin port?

Title: Re: Unexpanded A3000 with flickering display
Post by: cv643d on February 12, 2009, 08:53:48 PM

Nope, I havent. I should look into it immediately  :-)

Title: Re: Unexpanded A3000 with flickering display
Post by: cv643d on March 04, 2009, 08:37:34 PM

It was the U203 and U202 chips that was broken. Got replacements and the A3000 is as good as new after a fresh bath with soap and water + some new chips.

Title: Re: Unexpanded A3000 with flickering display
Post by: Damion on March 04, 2009, 09:05:39 PM

Quote

cv643d wrote:
It was the U203 and U202 chips that was broken. Got replacements and the A3000 is as good as new after a fresh bath with soap and water + some new chips.

Congrats! :pint:

Title: Re: Unexpanded A3000 with flickering display
Post by: cv643d on March 04, 2009, 10:12:03 PM

Thanks!

Now I just need to fix the broken A3000 keyboard with its blinking caps lock key..   8-)