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 khayoz
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A1200 Escom 1D4 Alice heat problem
Posted on 2-Mar-2013 2:13:15
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Regular Member
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Joined: 26-Dec-2004
Posts: 216
From: Stockholm, Sweden | | |
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| Is there a fix for 1D4 Alice heat problems? My board worked for 2 years with a 1260 but then started to corrupt the mouse pointer.
I know it´s Alice because all glitches disappear when I cool the chip down..
So does anyone know what pin Alice get it´s current on? _________________
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Franko
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Re: A1200 Escom 1D4 Alice heat problem
Posted on 2-Mar-2013 2:43:02
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Elite Member
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Joined: 29-Jun-2010
Posts: 2809
From: Unknown | | |
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| @khayoz
Had the same problem on an A1200 a number of years ago, fixed it by simply applying a small low profile heatsink to the Alice chip, worked fine after that... 
You can find the A1200 schematics at the following link for the info you're looking for but a simple heatsink should solve the problem...
http://www.amigacoding.de/index.php?topic=84.0 _________________
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klx300r
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Re: A1200 Escom 1D4 Alice heat problem
Posted on 2-Mar-2013 2:57:53
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Elite Member
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Joined: 4-Mar-2008
Posts: 3896
From: Toronto, Canada | | |
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| @khayoz
A heat sink as Franko mentioned is a simple & effective solution but I would also recommend installing a small fan in the case taking the power from the +5v of the floppy drive.
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realize
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Re: A1200 Escom 1D4 Alice heat problem
Posted on 2-Mar-2013 3:28:46
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Super Member
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Joined: 14-Apr-2003
Posts: 1797
From: nyc | | |
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| @khayoz
I have the same config, runs fine for hours. I'd recommend putting a nice copper heatsink on alice.. use thermal paste not sticker pad. |
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khayoz
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Re: A1200 Escom 1D4 Alice heat problem
Posted on 2-Mar-2013 3:42:59
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Regular Member
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Joined: 26-Dec-2004
Posts: 216
From: Stockholm, Sweden | | |
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| @Franko
I have tried a heat sink with fan but it doesn´t work, this is something else!
Like I said on other forums - I start it up wait till it get warm, glitchy mouse
and then I cool Alice down and all is perfect again.
But that is with an ice cube in a plastic bag!
Alice is drawing to much current for some reason and I wanna know why,
help me find the + pin (current in) of Alice and help me back trace it! Last edited by khayoz on 02-Mar-2013 at 03:48 AM.
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khayoz
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Re: A1200 Escom 1D4 Alice heat problem
Posted on 2-Mar-2013 3:47:54
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Regular Member
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Joined: 26-Dec-2004
Posts: 216
From: Stockholm, Sweden | | |
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| @Franko
Thank you for the schematics link,
I will look it through, cheers mate! _________________
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Franko
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Re: A1200 Escom 1D4 Alice heat problem
Posted on 2-Mar-2013 5:19:20
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Elite Member
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Joined: 29-Jun-2010
Posts: 2809
From: Unknown | | |
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| @khayoz
Quote:
khayoz wrote:
@Franko
I have tried a heat sink with fan but it doesn´t work, this is something else!
Like I said on other forums - I start it up wait till it get warm, glitchy mouse
and then I cool Alice down and all is perfect again.
But that is with an ice cube in a plastic bag! |
Like I said a simple heat sink cured for me the same symptoms you are descibing on the, even a quick blast of freezer spray was enough to make it "normal for about 15 minutes...
But if you're requiring an ice cube in a plastic bag to cool yours down then maybe there's something worse wrong with yours than the one I had... 
Just out of interest have you tried running it with everything possible detached, ie: no floppy drive, no accelerator/ ram boards etc... (just a bare mother board & mouse) to see what happens...
That way you could maybe track it down to a faulty power supply if no glitches appear when running a bare motherboard and as little as possible current is being drawn for the power supply... _________________
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khayoz
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Re: A1200 Escom 1D4 Alice heat problem
Posted on 2-Mar-2013 10:39:13
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Regular Member
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Joined: 26-Dec-2004
Posts: 216
From: Stockholm, Sweden | | |
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| @Franko
Yeah I tried it stripped down with just the mouse to get into boot screen,
same problem. _________________
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