RE: Indigo2: populating memory banks
I'm trying to see how small the holes are, I've seen some holes so small, even a vacuum gun won't guarantee to clear it. I have a HAKKO desoldering gun and a few tips, I have a small preheater as well. I wanted to find someone with a board they can take a close-up to see how close the pins are together and how pronounced everything is. Again, beter this is 20 year-old tech than today for this kind of thing.
With holes this small, the tactic isn't to heat gun and remove the slots...that's suicide! The tactic is to try to use a desoldering gun to remove ALL the solder from each pin (while wiggling) to clear the tiny holes while the pins are still running through them (makes for much better heat transfer through the via). Assuming you free the pin in the hole during cool-down (keep wiggling the gun), then after you've done all 100 holes or whatever, you attempt to wrench the old slot out of dry, bare, holes. Heating a pin or two that look stuck. I have a single Micro soldering tip that can reach through those holes and still require a solder sucker on the other side to clear them...it's tedious if you leave solder in before extraction in vias this size. But it beats having to hot air the board. A basic prewarm to hedge my bets, then hope my desoldering gun can clear would be approach A, approach B is the opposite: try to remove the entire slot while warm and then trying to clear the solder-filled holes (that are tiny and desoldering braid will only half-empty) using either an iron with compressed air to punch out molten solder, or the manual method I described (stick a micro-soldering tip in the hole, and use manual solder sucker on opposite side of the board while heating the hole to clear it).
No, this is job is so hard...I'd only be removing bad slots, won't remove healthy slots, it will likely take nearly an hour a slot until I find something that works (which could be over an hour). It's a big job, I'd like to believe it can be done with patience and perhaps taking breaks over several days if needed (as long as it's working).
anyone that thinks you're going to hot air this thing and pluck the slots out, then magically insert new ones with the solder staying molten...hasn't soldered a huge motherboard before. You cannot do that without risking other parts being damaged or failing off the board.
synthetix:
You say there are just two damaged slots? Are they next to one another (a touching pair)? Are they on the extreme end of the all memory banks, towards the CPU? If so, that likely increases chances of success.
If you're going to remove the mainboard anyway, could you look into taking pictures of the rear side of the mainboard memory area (all in frame with CPU region at edge of the picture frame) and look into instructions to remove the CPU module from the mainboard as well. Then take another sets of picture of the front (top) of the mainboard focusing on the SIMM slot area with the CPU removed.
That will show me how much space we have with the CPU out and any hidden components around the memory slots that could pose an issue.
If we can get good pictures, I'd be willing to make a decision based one those pictures to help you in this matter.
(This post was last modified: 08-13-2020, 07:19 AM by weblacky.)
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