[pinball_0]

NEWARK has the chips PART#73J0100 for the DS1780's preformed leads for surface mount

at 5.29 ea. I got 4 so that way I can replace the 3 on the motherboard all at once.

--note.--The one that  failed on my mobo was the one under the CPU module, and would you believe it was the last one I changed... checking every time between part changes.


SO THERE YOU GO.

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I did this repair in 2007, and the system is still good today.  My work and discovery was originally posted on a hardware forum in Nekochan.net in 2007. I had pictures and a lot of interest and replies.

Note ...caution when using heat gun near slots... heat will warp them
and ensure non of the i2c bus is shorted prior to powering. (check and double check) as I had knocked out the serial # crypto chip with i2c bus short.... but was easy to fix and change with good one.

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HERE FROM ORIGINAL THREAD

SUCCESS!!! I just finished replacing these 3 - DS1780's, and what a pain in the "back"... and I am now also seeing cross eyed. After getting them in place and heating them with the hot air gun (craftsman heat gun with pencil size nozzle) I successfully got them mounted...not registration perfect BUT in alignment with the pads close enough to make good contact. Few minor issues along the way.. one between pci bus slots hard to get at and heat gun started to deform a 66 mhz slot...ugggghh! quick, withdraw and slam in the 7.1 sound card... hmm tight and slightly begining to deform but ... it's ok.. so now it has its first internal mod..(haa haa) whew!! at least it didnt ruin that slot. (thank-GOD)

next one under processor module awful close to PIMM connector ok.. let see- learned lesson from pci slot so.. aimed gun opposite direction away from connector ... oh boy rs232 connector (L1) wants to melt alittle... but again didnt hurt the connection... good.

power it up... L1 reporting poop loads of arbitration errors ... including memory and other...
told me it had no mac # , no serial # and no led abritration plus other things..

NO SIGNS OF LIFE.. except L1 activity NO FANS AT ALL- crud darn danggidy doodle poop!!
(ACTUALLY I SAID ALOT MORE MATURE WORDS)

power off inspected closer again... hmm connections look ok.. started to ohm out pin of chip to feed through pad... hmm probes SO BIG!! like elephant gun to shoot ants.

using eyeglasses, with magnifing lenses that clip on, then hand held magnifying lens too.. make ya dizzy.. and almost loopy!! hey is that two legs on the upper left edge of the one that is normally hidden by the cpu card bridged.. is that stray solder... hhmmm

xacto knife time... why dont i just slide it carefully between every leg... and see.

looks clear for sure... power up!! YEAH fans !... L1 prompt looked proper
no complaints... typed env... all env looks great!

reassembled.. hooked up hard drive...
SUCCESS!! SUCCESS!! so all it can be done.. mine is living proof...

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11 YEARS SINCE REPAIR

[GRudolf94]

As for heatgunning the chip inbetween the slots: mask the area with kapton tape, and then tinfoil on top. Else, sure thing, you'll bubble up the plastic. Apply some flux and ChipQuik alloy to the chips being removed, too. They'll need less heat to come out, which lessens rework stress on the PCB.