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Amiga computer related discussion => General chat about Amiga topics => Topic started by: alphagemini on August 28, 2017, 08:06:17 AM

Title: A3640 prob
Post by: alphagemini on August 28, 2017, 08:06:17 AM

My a4000 040 died and I had it looked at by Leaman. They recapped it but said that the a3640 cpu card has problems. They think the cpu is ok but they only get a green screen on test. Has anyone had this problem and did it get fixed?

Title: Re: A3640 prob
Post by: hese7 on August 28, 2017, 10:23:37 AM

If the motherboard works fine with another A3640 but your A3640 is causing the green screen, yes I have fixed the same problem before. A broken trace (due to capacitor leak, etc.) on the A3640 board can cause a green screen.

Title: Re: A3640 prob
Post by: alphagemini on August 28, 2017, 10:55:44 AM

Thanks for your encouraging reply. I will push Leaman to look again

Title: Re: A3640 prob
Post by: Matt_H on August 28, 2017, 10:14:03 PM

My A4000 motherboard and 3640 are with Acill right now being treated for these same symptoms. I had assumed they were caused by damage from a capacitor leak on the motherboard rather than the CPU board. Will report back when I have a diagnosis from him :)

Title: Re: A3640 prob
Post by: alphagemini on August 29, 2017, 04:50:47 AM

Thanks for your reply. Good luck with it. I am thinking of getting a SAM 440-EP and stitching it into my 4000. I wonder if its possible.

Title: Re: A3640 prob
Post by: Acill on August 29, 2017, 06:15:05 AM

Quote from: Matt_H;830170

My A4000 motherboard and 3640 are with Acill right now being treated for these same symptoms. I had assumed they were caused by damage from a capacitor leak on the motherboard rather than the CPU board. Will report back when I have a diagnosis from him :)

Yup, things are slow and my normal full time job is sending me all over the dang place! Hope to have these done soon.

Usually, it is the CPU having eaten traces from the caps. The 3640 is famous for killing itself due to them reversing caps from the correct polarity during manufacture.

Title: Re: A3640 prob
Post by: SACC-guy on August 29, 2017, 06:46:22 AM

Quote from: alphagemini;830187

Thanks for your reply. Good luck with it. I am thinking of getting a SAM 440-EP and stitching it into my 4000. I wonder if its possible.

You are aware that the sam series of computers are stand alone with their own ppc cpu??

BTW, what is stitching...?

Title: Re: A3640 prob
Post by: alphagemini on August 29, 2017, 07:59:09 AM

Quote from: SACC-guy;830190

You are aware that the sam series of computers are stand alone with their own ppc cpu??

BTW, what is stitching...?

No, I wasn't. Bad idea then. I use the 4000 for number crunching and thought that sam could be a quicker kind of Amiga. Thanks for putting me right. Stitching? Re engineering probably covers it.