[rescue] Did i nuke my SS20?

[Ray Brooks]

Mark, Jonathan,
  Thanks very much for the above. I must admit some scepticism re: the new
chip. It doesn't look like a new one to me, but as Jonathan says, it could
be anything and the fact it got hot is of course a bad sign. I did remove
all cards but the video card on several attempts - I can try also
removing that and going down to just serial, thanks. One thing I have
noticed which is potentially scary is that the power LED is now no longer
lit. I have checked the power supply and it is delivering both 12v and 5v
to the motherboard so I'm reasonably certain that isn't at fault.
  I am now in the process of letting it sit while powered up for a while,
as Mark suggested, to see if it will go through that and come out of the
other side... fingers crossed, but now slightly more optimistic that Mark's
backwards insertion didn't actually kill the mobo. I'll report back
shortly...

Thanks both,

Ray


On Mon, 2 Aug 2021 at 14:49, Jonathan Chapman <lists at glitchwrks.com> wrote:

> Where did the replacement NVRAM come from? Some of the stuff coming out of
> China is completely wrong modules walnut blasted or blacktopped and
> relabeled. If it was getting hot and definitely not in backwards, there's a
> good chance you got a fake. Try going down to a really minimal
> configuration. I've had systems with a lot of RAM "feel" like they were
> bricked due to the RAM tests taking so incredibly long with a dead NVRAM.
> FYI, brand-new M48T08s from e.g. Mouser, Digi-Key, etc. don't work in old
> Suns anyway, there's some slight difference between the original design and
> the stuff you can get now. I've heard it's timing differences, but it
> affects the clock section only. That's why I did the GW-48T02-1 and
> GW-48T08-1 initially, since I had a pile of NVRAMs to rebuild. We're
> working on a complete drop-in replacement for the M48T02 and M48T08 that
> doesn't require rebuilding, since trying to buy dead modules from China
> resulted in $200 worth of totally counterfeit chips -- not just dead
> batteries, which I was fully expecting, but they weren't even the right
> modules. Most were Dallas DS12887s as used for PC CMOS. Thanks, Jonathan
> Original Message b On Monday, August 2nd, 2021 at 09:37, Ray Brooks <
> ray.userinterface at gmail.com> wrote: > Hi all, > A sad email. I replaced
> the NVRAM in my SS20 with an M48T18-150PC1. No > pops, strange noises etc
> but the new NVRAM chip was getting hot it wouldn't > POST. I switched back
> to the original NVRAM (stock) chip, still no POST at > all, either via 13W3
> or serial cable. My 13W3->VGA adapter tells me I have > no video signal. I
> was certain I had used the correct NVRAM replacement and > got the correct
> orientation. I've not seen a Sun in this situation before > and I'm worried
> that I may have done something wrong and nuked the > motherboard. Can
> anyone offer any advice as to next steps, or to help me > identify the
> issue? > Thanks and best regards, > Ray Brooks > rescue list -
> http://www.sunhelp.org/mailman/listinfo/rescue
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