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/  Forum Index
   /  Classic Amiga Hardware
      /  A3640 CPU Card Problems
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PosterThread
utukku 
A3640 CPU Card Problems
Posted on 5-Apr-2020 8:08:15
#1 ]
New Member
Joined: 21-Feb-2020
Posts: 7
From: Unknown

Hi,
I have spare A3604 Rev 3.1 board that i'm having problems with.


Have tested this on a working Rev B motherboard, and both the M/B and A3640 card have been recapped. But when I put the cpu card on, the monitor flashed white bands in the middle of the screen then the whole screen goes blank, then turns purple for a few seconds, then finally flashed blue, before staying blue.


I have run Amiga Testkit v1.7 using another cpu card and everything checks out, so it's not the M/B. Any ideas please?


Utukku

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10MARC 
Re: A3640 CPU Card Problems
Posted on 21-Apr-2020 16:08:51
#2 ]
Member
Joined: 3-Dec-2019
Posts: 36
From: Unknown

I sent a few cards into Acill Computing to have them looked at - he said that when these A3640 cards fail, they tend to fail quite hard... Only one out of three of mine still work.
You may be lucky, though, as mine just give me a black screen. I suppose there is a chance that you have a bad GAL, although not sure how that would happen unless there was some capacitor leakage.
Maybe a bad timing crystal? I suppose you could check that with a Oscilliscope if you have one.

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tonyw 
Re: A3640 CPU Card Problems
Posted on 22-Apr-2020 1:38:25
#3 ]
Elite Member
Joined: 8-Mar-2003
Posts: 3196
From: Sydney (of course)

@utukku

Are you sure it's not just a bad connection? Those 3640s are notorious for being intermittent if the board is not exactly parallel to the board underneath.

_________________
cheers
tony

Hyperion Support Forum: http://forum.hyperion-entertainment.biz/index.php

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utukku 
Re: A3640 CPU Card Problems
Posted on 23-Apr-2020 22:11:05
#4 ]
New Member
Joined: 21-Feb-2020
Posts: 7
From: Unknown

Thanks for the reply's. The card is now in the safe hands of Tristan Sondag. If he cannot bring it back from the dead, then I doubt anyone can.

I' will let you know the outcome when I do

Utukku
Quote:

tonyw wrote:
@utukku

Are you sure it's not just a bad connection? Those 3640s are notorious for being intermittent if the board is not exactly parallel to the board underneath.

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hese 
Re: A3640 CPU Card Problems
Posted on 24-Apr-2020 4:04:36
#5 ]
Member
Joined: 15-Aug-2011
Posts: 10
From: Unknown

Quote:
If he cannot bring it back from the dead, then I doubt anyone can.

I can.

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utukku 
Re: A3640 CPU Card Problems
Posted on 29-May-2020 10:59:22
#6 ]
New Member
Joined: 21-Feb-2020
Posts: 7
From: Unknown

@hese
The card is now in the hands of Chucky gang for a transplant onto one of his new A3640 boards

Last edited by utukku on 29-May-2020 at 10:59 AM.

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