|04-28-2007, 04:04 PM||#1|
Defender of the Faith
A2000 - green and sometimes yellow screens
After standing next to my desk for months, I decided to hook up my A2000 and give it a spin.
It worked well when I got it, but now it seems to have some kind of trouble which I cannot identify.
At first, it booted up correctly to the kickstart screens (1.3/3.1 switch built in). At that moment it had a GVP Combo 030, a GVP SCSI controller and a Buddha/Catweasel inside.
I took out all but the 030 card, and still it worked fine. I didn't check the working of the 030, but since no fast mem showed on the WB, I figured it was probably not working (I bought it as not working so no surprise there).
But all of a sudden, I started to have green and sometimes a yellow screen. Green means Chip RAM, so I re-seated the Fat Lady (don't know why it's not called Fat Agnus on the mobo), but nothing.
After that I reseated every chip, switched te CIAs, and tried with only the 3.1 or 1.3 ROM (no switch installed), but to no avail. I took out the GVP Combo before that, so it's just a plain A2000 with 1MB chip only.
The yellow screen only shows up sometimes (maybe once in every 30 times or so).
I have no clue what on earth can be wrong, so if anyone has ANY idea, please help me out.
| A4000 | CS-MK3 060@50 | Picasso IV |
| Member of Team Amiga (tm) | FidoNet 2:286/414.18 (long ago) |
| SysOp The Missing Channel BBS | Member of AGA BBS Intl. |
|04-28-2007, 04:57 PM||#2|
Join Date: Feb 2002
Location: Schweiz Suisse Svizzera Switzerland Suiza
Re: A2000 - green and sometimes yellow screens
- One of the ramchip is bad.
- Yellow means a software-failure before the "Guru-medtrap is isntalled, therefor a yellow screen instead of the guru
- Check the battery if it is leaking and if so which damage has occured.
- In rare circumstances the little ics 1488 and 1489 near the serial port could be damaged. They are cheap, but soldered to the board. If changing them consider to buy also sockets for these chips.
- Did you once install a 2MB chipmem adpter, look at the traces you had to cut on the board.
- what does the powerled indicate?
- no peace of metal on the mainboard causing a short? (screw etc.?)
- look at the capacitors everywhere on the board. Is there anyone with a buckle (or worse leaking)?
- Is the board correctly fitted into he case? Once I had a strange A2000 with a black bar from the end to the front. If this bare was installed the A2000 had a yellow screen, when I took it out the A2000 run perfectly. This bar should stabilze the case, but it seems to be just a little too short, so i bends the innerfront to much towards the board and cause somewere a short.
|yellow , screens , green , a2000|
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