Has a 128 Mb EDO module fried my PPC ???

[Effy]

Checked the post today and found a package with 2 HP EDO modules of 128 Mb doublesided each (#A3830-6001) meant for several HP 9000 modules. I have put one in my Blittard PPC 160/040 in the memory slot with the angle a bit up. Turned computer on and nothing, zip, nada. What I did get was that I noticed the smell of smoke  :oops: Removed 128 Mb module but computer still refused to boot. Removed Blizzard and turned it on without turboboard, but still nothing. Have tried the Blizzard in another A1200 with the 32 Mb module that was in it before but even the light of the A1200 will not turn on. The smell of smoke was both on the turboboard and on the memory module. So I tried my Microbotics 1230 XA with the 2nd 128 Mb module ... even the green light didn´t turn on. Tried a 16 Mb module and the computer booted. Tried the 128 Mb again and it didn´t boot, drive didn´t click, nothing. There was no harddrive connected so this can not have been a cause ...
Now what  :-?

[x56h34]

Looks like you ordered wrong HP 128MB simms. The correct type to look for is "D4893A". If you noticed smell and smoke, take a look at the simm socket itself and see if there's any burned plastic that may have leaked over a pin, which may potentially disable a good contact with it and the memory module.

In any case, those HP modules may be of wrong voltage. I would not use them again unless you are absolutely sure that they are "D4893A" type, which have been confirmed to work with Blizzard accelerators.

[Effy]

The smell of smoke is located at one end of the Simm socket, also on the HP module itself.  :oops:
But my A1200 now won´t boot anymore, not even without a turboboard, and also not with my spare Blizzard 1230  :pissed:
Funny that the Microbotics does not give the smell of smoke when the other 128 Mb module is placed on it. And it does work again when I put a normal 16 Mb module on it  :-o

[Effy]

I am also expecting a sending of SAMSUNG 128MB 32X36-60ns ECC SIMM Memory chips with pn: KMM53632000AK-6U ... how can I know if they will work or not  :-?

[Tahoe]

Avoid HP9000 parts, that's a UNIX server with a completely different hardware design to a regular PC. Chances are those SIMM's use a very different voltage and maybe even pin orientation. I know upgrading memory on one os those machines cost us more then a complete new Proliant server!
I can confim the D4893A work fine in my 1230 (or better, in my SCSI option, the simm is too large for the Blizzard itself). The D4892A also work, but these are 32MB.

[Effy]

When I discribed the problem and how it occured to one of our belgian club members (with a major technological background) he immediately assumed something got too much Volts and burned, even my Amiga itself. I am gonna try to have him fix it but I guess I´ve got tot keep my fingers crossed ...

[Tahoe]

Doubt it, but it's not impossible. You would expect the SIMM to get too much volt and burn, but then the PPC should work normally. I have seen this often on PC mainboards, people fixing their DIMM's wrong way around. You get a burned DIMM (really burnt, tracks completely molten off) but the mainboard works fine afterwards. The SIMM itself does not give any voltage back to the slot. The only option could be that a input line is crossed with an output line on such a dimm, basically sending cards voltage back to the card in a place it shouldn't be.
Hope you get it fixed!

[Effy]

That is exactly the information I got today when I brought him the PPC card and the Amiga too ... now I can only wait and see ...

[Hyperspeed]

Oh no!

I've been saying on threads for 6 months to avoid EDO, ECC, Parity,
Double Sided and Server SIMMs!

I tried my best but everyone wants to buy the cheapest and get 128mb!

It's not easy to get a good SIMM memory module for Amiga but if you
keep an eye out for the good stuff you'll have peace of mind.

I hope that smell of smoke is temporary, give it time. Keep the Amiga
off for a day and wait and see.

I once smelt smoke from my old 2.5" IBM hard disk but it seemed to
work fine after I left it be for a while.

That may defy logic to electrically minded but let's hope it's a burnt
PSU fuse (from too much power drain - the white 1Amp glass fuse) or
the server SIMM took the brunt of the power surge.

Also, someone on here was talking of using 3.3v Vs 5v SIMMs, I hope it
wasn't you Effy!

:-D

[Effy]

Hyperspeed : ehm, I´m afraid I have asked such a question in one of my topics before  :oops: Fact is that my RBM tower power supply still works but that the A1200 itself doesn´t, not even without turboboard. I have also been told that there seem to be buffers on the Blizzard PPC and that they are probably burned too ... our clubmember Flurk is going to try to fix it. I noticed that he read the card the same way I read a posting in Dutch, like an open book. I didn´t understand a word of his explanation but he did seem to know what he was talking about and also had the schematics of the A1200 motherboard ...  :-o

[nex4060]

overcurrent in a computersystem can/will have huge implications as it can burn alot of supportchips :-o  :pissed:

as it sounds like the memory simm has drawned alot of current.

btw: did you make sure that the simm did not touch the metalshield? because there is about -110v in the gound, to shield the computer. Alot of bad things can happen if any part of the computer i shorted with the metalshield, trust me  :-o

[Framiga]

btw: did you make sure that the simm did not touch the metalshield? because there is about -110v in the gound, to shield the computer. Alot of bad things can happen if any part of the computer i shorted with the metalshield, trust me

erm . . .may i suggest you, to check your house ground system? ;-)

[Effy]

Do you mean the original metal shield ?? Haven´t seen one of those for ages !! What I meant was a Blizz PPC card in a RBM Towerhawk tower, not touching anything and the 128 Mb module certainly not touching the PPC board  :-)

[StormLord]

Its also possible to burn the memory controller or the motherboard if you put a 5v memory module into a 3.3v slot..
Also you can *but is rare* burn the mobo by putting a 3.3v on a 5v socket but only if some resistor on the modul by burning stays circuited.

[Effy]

Thanks for all the support and advice guys !! Got a mail yesterday evening from our ´technical minded´ clubmember informing me that both my A1200 and Blizzard PPC work again  :-o Cool !! THE perfect Xmas gift  :lol:

Now I only need to discuss the price  :-D