3000T mother board help

[ads1500]

Ok, got the led/kb board working on mine and then transferred over to new MB, still no boot aaarrjjjjjjj

Double checked jumpers per Dr. who.. nothing

Will let it be for a while and then check again

 

[lostrego]

Does it respond to a keyboard reset? Once switched on try that also.

 

[ads1500]

No response to keyboard reset
Thanks

 

[drwho]

well, it was worth a try, sorry my friend.

If I think of anything else I will post it immediately.

 

[tect]

I had a very similar problem with an A3000D I got from a friend.
It simply didn't boot after being some time in the basement, it showed a dark grey (almost black) screen.
User MGR3SA from A1K.org fixed the mainboard for me after a lot of testing: one of the soldered in RAM chips of the first MB Chip RAM was faulty!
(Thread title "A3000 bootet nicht mehr, diunkelgrauer Bildschirm" on German A1K forum)

You need diagnostic ROMs to troubleshoot this kind of error...
[FONT=Arial,Helvetica]http://www.a1k.org/forum/member.php?u=403[/FONT]

 

[rkauer]

One more test:

-First, remove all the FAST RAM ZIP chips. Try to boot.

-Then remove the socketed chip RAM DIP chips. Try to boot.

After that, remove the Agnus, insert it again and do a final test. If no result, it is nothing more I can think of without having the hardware on my hands.

 

[Tahoe]

-Then remove the socketed chip RAM DIP chips. Try to boot.

In the 3000T chipram is ZIP. Half of which is socketed.
You could indeed try removing the 1MB that is socketed to exclude that being the problem.

 

[moofree]

It appears I'm now the owner of the board in this thread.
When it arrived, it had a few bridged pins on the 68030.
Pins 16+17 (bus grant and acknowledge) and 18+19 (Vcc and Ground(!)) had been shorted.
I've carefully separated them with a razor blade, but testing will have to wait till I hack up an a3000t power supply lead.
Will update...

 

[Buzzfuzz]

I really am a bit puzzled to why someone wants to do this to a perfect working 3000T.