A3000 Failure

[jlariv8957]

Hi,

I've buyed a buster 11 chip for my a3000 with a fastlane z3 & picasso 2+/A3640 card

All was running fine for about 3-4 hours then some garbadge graphics on screen appeared.i turned the amiga off & on then ... black screen. after removing all cards & verifying all chips no heartbeat.
When I remove daughterboard the screen becomes yellow (this is normal, i know it was just for testing purpose)

I also heard some noise : FDD's head where moving randomly

I let the 3000 on about 20minutes and the 68030 was anormaly hot: i burnt one finger in about 1/2 second !!

If someone have an idea about this or how to find a new A3000 motherboard please let me know !

Thanks.

[DethKnight]

Hey those are the same symptoms that my A3000 has

[lorddef]

It's unfortunate that aged but usefull hardware eventually dies like this. My amiga is still going well fingers crossed, although my g3 mac has recently started to refuse to boot from a cold start, I hope it's not on its way out.

[Noster]

Hi,

> When I remove daughterboard the screen becomes yellow (this is normal, i know it was just for testing purpose)

So the CPU is still functional and the ROM is accessed and the earliest bootcode is processed, when a hardware defect is found.
Have you tested the other custom chips ?
I think that any of the other chips is dead (SDMAC, RAMSEY, AGNUS) -- have you replaced the new Buster with your old one ? -- I would also test the CIA's and the SCSI-chip. I was searching for an error in my A3000T that fails to boot (grey screen) and sometimes ended with a yellow screen and it seemed to be a defective SCSI-controler chip. After replacing it with a newer revision, the A3000T works again.

Noster

[jlariv8957]

Hi,

Thanks for all your advices,

I tryed to replace buster with the older one. for the other custom chip i have some spares but not at home, so i don't tryed to replace the other chips.

why all the other chips would be dead ?

I have also thought to DMAC because it is the chip whitch is overheating with the A3640 but i don't have spare for this chip.

Thanks a lot.

[metalman]

jlariv8957 wrote:

All was running fine for about 3-4 hours then some garbadge graphics on screen appeared.i turned the amiga off & on then ... black screen. after removing all cards & verifying all chips no heartbeat.
When I remove daughterboard the screen becomes yellow (this is normal, i know it was just for testing purpose)

Noster wrote:
So the CPU is still functional and the ROM is accessed and the earliest bootcode is processed, when a hardware defect is found.

>The hardware error is a clue, with the daughterboard installed, what is the error screen?

A black/grey screen can be eithor the daughterboard unseated or SCSI chip failure.

The garbage graphics on screen probably an overheating chip, need more airflow to keep cool.

[Noster]

Hi,

> why all the other chips would be dead ?

Not ALL chips, ANY of these chips ;-)

> I  have also thought to DMAC because it is the chip whitch is overheating with the A3640 but i don't have spare for this chip.

A new DMAC (390537-02) may be ordered by Vesalia (http://www.vesalia.de) for 3,36 EUR + shipping.

Noster

[jlariv8957]

My 3000 is living !!

I replaced Paula from my old stock and the 3000 runs fine now, i have some luck the first chip i replaced was the deffective !

The hot temperature problem was because i remove my A3640 from my computer without correctly changing switches on motherboard.

All is ok now

[T3000]

searching for an error in my A3000T that fails to boot (grey screen) and sometimes ended with a yellow screen and it seemed to be a defective SCSI-controler chip. After replacing it with a newer revision, the A3000T works again.

I'll have to give my A3000T another once over with this info. Mine died last week with the same symtoms.

Of course, Amiga death only happens when you really need the system to do something besides take up space and consume power...    :nervous: