si/ssi tram on ebay $75 each

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nam
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si/ssi tram on ebay $75 each

Unread postby nam » Tue Feb 24, 2004 9:11 pm

There seem to be 4 si/ssi tram in ebay, $75 each....

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... gory=11223

Too bad I need SSE or SSI... anyway good luck.

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The Keeper
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Re: si/ssi tram on ebay $75 each

Unread postby The Keeper » Wed Feb 25, 2004 5:42 am

As a word to the wise, all SI/SSI TRAMs that are purchased should be thoroughly tested with OpenGL demos before considering the TRAMs to be "working". The IRIX IDE doesn't exercise them, and they have a nasty tendency to fail, presumably due to heat. I have three of them on the shelf that don't work, for one reason or another.

Look for any irregularities -- colors wrong, blockiness, etc.

So, make sure that you have at least a 3 day guarantee against DOA to verify that the TRAMs are working.

SE/SSE TRAMs are newer and possibly better designed; I haven't seen any bad SE/SSE TRAMs yet.

Chris


nam wrote:There seem to be 4 si/ssi tram in ebay, $75 each....

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... gory=11223

Too bad I need SSE or SSI... anyway good luck.

andreas@rootprompt
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Re: si/ssi tram on ebay $75 each

Unread postby andreas@rootprompt » Wed Feb 25, 2004 6:37 am

The Keeper wrote:and they have a nasty tendency to fail, presumably due to heat. I have three of them on the shelf that don't work, for one reason or another.


it is because of the heat. The problem is that the connectors of the RAM chips desolder due to the heat over time. I have four defective TRAMs here, all four of them are failing because of this. It's not too difficult to fix (done it on two last night, leaving me with a shiny new MXI :) ), but that's of course nothing for the average buyer.

SE/SSE TRAMs are newer and possibly better designed; I haven't seen any bad SE/SSE TRAMs yet.


I have - but it doesn't happen too often.

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whiter
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Re: si/ssi tram on ebay $75 each

Unread postby whiter » Wed Feb 25, 2004 9:47 am

andreas@rootprompt wrote:
The Keeper wrote:SE/SSE TRAMs are newer and possibly better designed; I haven't seen any bad SE/SSE TRAMs yet.


I have - but it doesn't happen too often.


Ah! So it's the SE/SSI TRAM's that are so buggy. That gives me some relief since I'm always worried my MXE will suddenly break. Thanks :)
Shall I describe it to you? Or do you want me to get you a box?

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The Keeper
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Re: si/ssi tram on ebay $75 each

Unread postby The Keeper » Wed Feb 25, 2004 10:00 am

Very interesting. Thanks for mentioning this! It's not like the bad TRAMs are worth anything, so if I damage them, they're already broken. I'll take them apart and check them out with a magnifier.

Chris


andreas@rootprompt wrote:
The Keeper wrote:and they have a nasty tendency to fail, presumably due to heat. I have three of them on the shelf that don't work, for one reason or another.


it is because of the heat. The problem is that the connectors of the RAM chips desolder due to the heat over time. I have four defective TRAMs here, all four of them are failing because of this. It's not too difficult to fix (done it on two last night, leaving me with a shiny new MXI :) ), but that's of course nothing for the average buyer.

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Dr. Dave
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Unread postby Dr. Dave » Wed Feb 25, 2004 10:19 am

Any good tips on dissassembling a TRAM? (I've got access to a microscope, plus SMT tools *glances to the right*)

andreas@rootprompt
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Unread postby andreas@rootprompt » Wed Feb 25, 2004 10:25 am

yep. Unscrew the four screws at the bottom, then lift the black top ;)

BTW, for checking the joints I used a small plastic stick and carefully went along the lines of the IC pins - everything that moved needed soldering and everything that might have only moved because I tipped it with the stick would've needed solder after a few hours of operation anyway :mrgreen:
Last edited by andreas@rootprompt on Wed Feb 25, 2004 10:34 am, edited 1 time in total.

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Dr. Dave
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Unread postby Dr. Dave » Wed Feb 25, 2004 10:30 am

gotcha... will have to give that a spin.

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ducks
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Unread postby ducks » Wed Feb 25, 2004 11:23 am

MXE trams can fail as well becouse of overheating. Got one dead one myself

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Shtoink
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Unread postby Shtoink » Wed Feb 25, 2004 1:47 pm

Should't there be a way to replace the faulty components on the TRAM? I know it might be easier to just replce the entire thing, but it may be cheaper to replace the memory modules that failed.

Who knows, just a thought...:?:

andreas@rootprompt
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Unread postby andreas@rootprompt » Wed Feb 25, 2004 2:20 pm

of course you could replace the RAMs on the module, but why? It's not the RAMs which are failing. They just desolder themselves due to the heat - the chips are fine, the joints aren't ;)

directedition
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Unread postby directedition » Wed Feb 25, 2004 2:34 pm

Yeah, it sounds to me like the problem could be solved by someone with a fine tip soldering iron and steady hand. Though I'm not sure what kind of damage could be done if the solders melt and mingle causing various parts to short....
- Jim
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