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| Click here to select a new forum. | | Sad Mac Code 040002 | Posted by: retrobecanes on 2016-12-07 08:59:04
A few months ago I bought a NOS Mac 128K mobo. I installed it and it worked perfectly well. After a couple of weeks, I put the computer away in storage as I was working on other computers. Today, I take the Mac 128 out of storage to give it a spin, I power it up and I immediately get the sad Mac code 040002. Based on the code list, it appears to be a failure in the memory chip at location F2...great! I guess that I will have to take this opportunity to have all the memory chips socketed and replaced. But I have a quick question: does RAM just go bad like this or could it be a power/PSU that fried the memory?
| Posted by: IlikeTech on 2016-12-07 10:04:48
The chips are very old, so the chips may just be bad. Try replacing it, and if it blows again, then maybe the power supply is at fault.
| Posted by: BadGoldEagle on 2016-12-07 10:50:09
If it has the original Apple RAM, then you'll have to replace all of those RAM ICs. The RAM Apple used on the 128k macs is trash.
When I bought my 128k, I also had to replace the RAM. Uniserver can do it. Link to his website: http://www.maccaps.com/MacCaps/For-Sale.html
Uniserver told me that he used to replace one RAM chip at a time but he also told me that the same person kept sending him the same board over and over again because all the old chips failed one at a time. So he prefers to change them all at once nowadays.
Although $175 seems a little steep, it is well worth it because the new RAM will last a lifetime. Apparently it is very difficult to desolder the chips as there are a lot of traces in that region that could be destroyed very easily (according to him).
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