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Author Topic: Tech: Installed FPU in E-matrix and A1200 no longer boots  (Read 2431 times)

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Offline cantido

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Re: Tech: Installed FPU in E-matrix and A1200 no longer boots
« on: November 22, 2008, 02:42:26 PM »
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Homer wrote:
I would hazard a guess that you have fried every chip on


I cant see much CMOS logic from the photo... 74F series are TTL if I remember correctly and shouldn't be as easy to kill with ESD.

So, no, it wouldn't be every chip.
 

Offline cantido

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Re: Tech: Installed FPU in E-matrix and A1200 no longer boots
« Reply #1 on: November 22, 2008, 08:55:14 PM »
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Homer wrote:
It's a general observation that comes from seeing many pcb's sat (usually) on carpets both here and Ebay, and people telling us they don't work properly.


mmm if they've taken a photo of the pcb to show us when it doesn't work.. wouldn't it have already been broken before it went on to the carpet (or similar) to be photo'd?

I wouldn't buy anything off ebay that wasn't guaranteed against it being DOA unless I was buying it for spares.

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In my work as an electrical/electronics Engineer working on trains in the UK


Working with higher voltage -- CMOS -- logic? You'd think the stuff used on trains would be a little be more rugged considering it's going to get shaken around, covered in crap etc.. A lot of stuff has protection against ESD up to 15kV or something these days.


Anyhow.. I would have said taking a soldering iron to the thing would have been more of concern.