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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: dvvrue95 on July 20, 2006, 02:59:45 PM

Title: A4000 gone dead - part three
Post by: dvvrue95 on July 20, 2006, 02:59:45 PM

Hi there (again) folks,

ok so whislt I am awaiting that great Amigian in the sky to rustle me up a A4000 mb I thought I would do some more (limited) testing this time with the audio connectors plugged in as well as the video connector.

When I power on without any FD, HDD, daughterboard all that happens is either :-
(a) the power led flashes repeatedly in 5 or 6 cycles and there is a synchronised clicking from the output of the audio and flickering video from a a screen which is dimly grey, or
(b) as above but with intermittent yellow screens.

Oh by the way does anyone know if the A4000EC04 uses a socketed cpu?

many thanks, Ian
 

Title: Re: A4000 gone dead - part three
Post by: Matt_H on July 20, 2006, 04:21:24 PM

From what I remember, the daughterboard absolutely must be installed for anything to work. Plug it and the floppy drive back in.

Quote

Oh by the way does anyone know if the A4000EC04 uses a socketed cpu?

All A4000s have the CPU mounted on a processor card. On 68040 models, the chip should be socketed on the CPU board. On 68030 models, the CPU is soldered to the board. Revision D motherboards are the exception - they have 68030 chips soldered to the motherboard.

Title: Re: A4000 gone dead - part three
Post by: dvvrue95 on July 20, 2006, 07:21:46 PM

Quote

Matt_H wrote:
From what I remember, the daughterboard absolutely must be installed for anything to work. Plug it and the floppy drive back in.
_______________________________________________________________

Hi Matt,
tried that with just the  same results, but I also removed all the ram simms and did get a green screen - but I guess that figures since green screen is supposed to indicate a ram problem?  

thanks for feedback,
Ian.

Title: Re: A4000 gone dead - part three
Post by: patrik on July 20, 2006, 08:18:16 PM

Matt_H:

The A3000 gurus and gives yellow screens without the daughterboard, but the A4000 works fine without it.

dvvrue95:

The simm closest to the daughterboard connector is the chipram simm and green screen indicates a chipram error, which isnt strange if you have removed the chipram simm :D.

Try installing just the chipram simm.

Are all jumpers correct - was it a working A4000 that just stopped working?

Have you tried another processor card? And if so, don't forget to set the INT/EXT jumpers correct - EXT = A3640 (stock A4000 040 card), INT = A3630 (stock A4000 030 card).


/Patrik

Title: Re: A4000 gone dead - part three
Post by: dvvrue95 on July 21, 2006, 11:12:48 AM

Quote

patrik wrote:

Try installing just the chipram simm.

Are all jumpers correct - was it a working A4000 that just stopped working?

Have you tried another processor card?

_______________________________________________________________

Hi Patrik

I tried it with just chipram fitted and it was just the same i.e. flashing power led - clicking audio and maybe an occasional yellow screen.

I guess you missed my earlier threads :-
A4000 gone dead
and A4000 gone dead part 2
It was a working A4000 that just went dead, I was trying to install a replacement (bigger) second drive and having trouble with HD install so I was running Disc Salv which was very slow so I left it running overnight when I returned the A4000 was dead. I did manage to get the insert wb3.0 screen once by disconnecting hdd, fdd and doing a cold restart but not anymore.

thanks for your interest, Ian

Title: Re: A4000 gone dead - part three
Post by: HellCoder on July 21, 2006, 11:53:32 AM

Quote

From what I remember, the daughterboard absolutely must be installed for anything to work. Plug it and the floppy drive back in.

This isn't true. I've got one of my A4000's up and running WITHOUT the daughterboard. I removed it coz the PPC/CVision are generating lots of heat. Now the area they live in is bigger. It works perfectly!

Title: Re: A4000 gone dead - part three
Post by: Ronmor on July 21, 2006, 12:25:47 PM

Hi lan,
  It sounds like the extra Harddrive might have been to much for the old 4000 power supply.
   Ron

Title: Re: A4000 gone dead - part three
Post by: dvvrue95 on July 21, 2006, 07:13:28 PM

Hi Ron,

thanks for that idea, but already confirmed its not the psu, by measuring voltages ( seem my other threads for the mess I made of that first time around!) on mb power connector and even connecting a "borrowed" atx psu via a atx / A4000 power converter cable from Amigakit.

So that`s why I'm now looking for another mb or processor board.
Ian.

PS the A4000 did have two hd's and worked fine before I started down this route.

Title: Re: A4000 gone dead - part three
Post by: Matt_H on July 21, 2006, 11:03:33 PM

@ HellCoder and patrik

Whoops. Guess I was thinking of the A3000. Since they have very similar architectures, I thought maybe the same would apply...