A2000 repairs

[spaceman88]

Hi,
I've never used an A2000 before and now I have 3 of them!!! Unfortunately they all have the same problem. When I turn them on the power light comes on but all I get is a black screen, the floppy drives don't do anything (there are no hard drives). So I took 2 of them apart to remove the batteries, one has missing traces, severe corrosion and I don't think will live again :-(. The other one cleaned up fairly well, but still no picture. I checked the power supply for +/- 12v & +/-5v seems OK. Two of these are A2500's with 68030 cards, will they boot without these boards without changing some jumpers? Is there something common besides the batteries?
Thanks, Len

[spaceman88]

Hi.
To answer a few of the questions...

I have a 1084s monitor & a Sony TV with video inputs, when I turn it on connected to the TV "NTSC" pops up onscreen so something is going on ( with the "good looking" board, I haven't tried the badly damaged one because it looks beyond repair)

I have removed all boards (Toaster, TBC's & Commodore 68030) and floppy cable

I had the +/-12 & +/-5 on the connector, but I noticed on the last pin (13 or 14) I had 2.5V, not sure if that is normal or not.

I had removed the 68000 to clean under it, used contact cleaner on the socket.

I will try swapping the CIA's & others, I don't have a chip puller for Agnus.

I still have one A2500 (with another toaster GVP 68030) that I have not taken apart yet, hopefully I can get at least one going!

Thanks for any hints, Len

[spaceman88]

Hi,
Just a quick update. I've checked all three boards, 2 are badly damaged from battery leakage the third one has several pins in the 68000 socket that don't make contact, so I'm going to order a new socket. I got a new Ebay motherboard with no leakage (for $34), it's Version 4.4 kickstart 1.2.
I tried two different kick 2.04s from the written off boards (version 6) and neither worked (a kick 1.3 did work). Is there a problem putting 2.04s in a ver. 4.4 board or did I get very unlucky and have two bad chips? Also can I just plug the Megachip from one of the ver. 6 boards into the 4.4 and have it work?
Thanks.