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Old 05-25-2021, 02:00 AM   #21
eccerr0r
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Default Re: repairing traces...on a fine pitch board?

<taps> The 512M DDR2 was sacrificed as a donor board.

<Sounds of cheer> The 2GB DDR2 now passes Memtest86+ !!!

I wasn't able to desolder the MLCC that I wanted to replace...sigh... tested it without replacing it, and so far it works at ddr2-200, whether it will work at ddr2-333 is another question.
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Old 05-26-2021, 02:29 AM   #22
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Default Re: repairing traces...on a fine pitch board?

FAIL

Still fails memtest86+ at 333MHz
Looks like I have to replace the MLCC... but somehow it simply won't come off the board. Glued on?

Ugh... this has become the most frustrating solder repair job ever, from finding the error to sourcing parts to actually replacing the bad parts...
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Old 05-26-2021, 02:36 PM   #23
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Default Re: repairing traces...on a fine pitch board?

You became to far to give up now...
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Old 05-26-2021, 03:36 PM   #24
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Default Re: repairing traces...on a fine pitch board?

damn a tiny MLCC is a freaking 2.2F... that's huge for its size.
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Old 05-27-2021, 03:24 AM   #25
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Default Re: repairing traces...on a fine pitch board?

probably because it's only rated for 10v or less
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Old 05-27-2021, 12:35 PM   #26
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Default Re: repairing traces...on a fine pitch board?

Yeah, well, probably 4V, but if the device works at 1.8V, this is plenty of margin!

The 0805 resistor pack was replaced, and I could NOT get the cracked, probably 0603, MLCC removed, and since I had that 0805 2.2F cap anyway... jumpers paralleled onto the 0603 cap!

Ok Ghettoly poor job at solder... and I wonder if this still works...

[EDIT]

Running on my P4 now, and so far it still passes @ 266MHz...
Attached Images
File Type: jpg ghettoed.JPG (61.9 KB, 20 views)

Last edited by eccerr0r; 05-27-2021 at 01:05 PM..
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Old 05-27-2021, 01:51 PM   #27
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Default Re: repairing traces...on a fine pitch board?

modern art right there!
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Old 05-27-2021, 05:45 PM   #28
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Default Re: repairing traces...on a fine pitch board?

Soldered a 30AWG wire to both sides and soldered the 2.2F cap to the two wires.

Still don't know what I should have done to the old cap that didn't want to come off... very risk to pry it off, paralleling it seemed like the best choice.
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Old 05-28-2021, 04:06 AM   #29
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Default Re: repairing traces...on a fine pitch board?

a blob of solder over the whole cap usually shifts them.
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Old 05-28-2021, 08:48 AM   #30
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Default Re: repairing traces...on a fine pitch board?

I don't think it was heat that was the problem, while trying to desolder that cap with hot air, I blew away the resistor pack multiple times. That was really annoying...
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Old 05-29-2021, 08:30 PM   #31
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Default Re: repairing traces...on a fine pitch board?

A bubble of solder and the iron would preform way better, imo. (see above suggestion from @stj)
While heat may not have been an issue (probably was imho), if it's not concentrated on the specific component, with all the surrounding components properly isolated, won't do the job.
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Old 05-29-2021, 11:55 PM   #32
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Default Re: repairing traces...on a fine pitch board?

I actually tried using two irons at the same time...didn't budge...
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Old 05-31-2021, 11:09 AM   #33
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Default Re: repairing traces...on a fine pitch board?

Use more flux?
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