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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: rkauer on June 05, 2006, 07:04:40 AM

Title: A2000 don't boot, appear a grey screen
Post by: rkauer on June 05, 2006, 07:04:40 AM

Then reboots again, and again, and again......

I've try to change all the customs chips (from an A500), except the slots controller. Exchange the floppy drive also.

But nothing different happened!

Help!!!

Title: Re: A2000 don't boot, appear a grey screen
Post by: Argus on June 05, 2006, 11:21:21 AM

Did you try swapping out the 68000 and rom chips too?

Title: Re: A2000 don't boot, appear a grey screen
Post by: Oli_hd on June 05, 2006, 11:37:02 AM

Dark grey or light grey?

Also have you removed any Zorro cards installed?

Title: Re: A2000 don't boot, appear a grey screen
Post by: rkauer on September 25, 2006, 01:45:39 AM

I've changed all Custom Chips from a working A500 (including the ROMs), 'cause these are exactly the same. The exception was the bus controller chip.

Unfornatetly, the same behavior. I suspect this is caused by a faulty TTL or memory (onboard) chip.

The A520 don´t work either (I thonk that´s because the 22 and 23th pin of the RGB conector of the 2000 isn´t connected, by default). I used it only with a C= A1942 without the TTL adaptor. Used to work.

Title: Re: A2000 don't boot, appear a grey screen
Post by: rkauer on September 25, 2006, 01:52:22 AM

Light grey.

Title: Re: A2000 don't boot, appear a grey screen
Post by: rkauer on September 25, 2006, 02:00:48 AM

Houwwwwwwwww, I forgot: I've take out all daughter boards.:-D

Is there any onboard jumper to change or remove? :-?  

Title: Re: A2000 don't boot, appear a grey screen
Post by: rkauer on October 20, 2006, 04:30:50 AM

Done!

Was two damaged chips: Fat Agnus (Fat Lady in bigboxed Amigas) and U302 (74LS32). Could be either R200 (1 Ohm x 1/4 W), who was right.

The board works fine now (with GVP 030 Combo, Modem, Lan Card and TOASTER!).

Hurra! :-D  :-D  :-D