repairing traces...on a fine pitch board?

[clearchris]

Re: repairing traces...on a fine pitch board?

Use more flux?

[eccerr0r]

Re: repairing traces...on a fine pitch board?

I actually tried using two irons at the same time...didn't budge...

[megaraider]

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.

[eccerr0r]

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...

[stj]

Re: repairing traces...on a fine pitch board?

a blob of solder over the whole cap usually shifts them.

[eccerr0r]

Re: repairing traces...on a fine pitch board?

Soldered a 30AWG wire to both sides and soldered the 2.2uF 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.

[stj]

Re: repairing traces...on a fine pitch board?

modern art right there!

[eccerr0r]

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 2.2uF 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...

[stj]

Re: repairing traces...on a fine pitch board?

probably because it's only rated for 10v or less

[eccerr0r]

Re: repairing traces...on a fine pitch board?

damn a tiny MLCC is a freaking 2.2uF... that's huge for its size.

[megaraider]

Re: repairing traces...on a fine pitch board?

You became to far to give up now...

[eccerr0r]

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...

[eccerr0r]

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.

[eccerr0r]

Re: repairing traces...on a fine pitch board?

Yeah, definitely, though repairing this module would go with the above module and the number of 2G modules would be even once more...

Anyway, this machine with three 512M modules will not get 3.5GB (3200MB ... chipset limitation)... 3GB maybe, when I pull the 1G modules out of the other machines to stuff these repaired 2G modules in.

[megaraider]

Re: repairing traces...on a fine pitch board?

Current dilemma : cannot get debug information from a dead 512M DDR2 module.

Need parts for a 2G DDR2 module that I rootcaused a failure.

Sacrifice pointless 512M module to fix a much more useful 2G module?

Should add why I even want to repair this 512M module: because without it, I'd have an odd number of 512M modules... there's this machine that has three working 512M modules in it right now...

Better to have an odd 2GB than an odd 512MB module
(Providing motherboard RAM size is not limited to less)

[megaraider]

Re: repairing traces...on a fine pitch board?

what a nice pointless repair! momaka will be proud! do post the link to this thread in the pointless repairs thread!

pointless?
do you know how expensive used dimms are becoming?
new stuff costs far less than used ddr or ddr2.

IMO this is an excellent example of forum member misbehaviour
[Most forum moderators would have block you @ChaosLegionnaire without any warning]

[eccerr0r]

Re: repairing traces...on a fine pitch board?

Current dilemma : cannot get debug information from a dead 512M DDR2 module.

Need parts for a 2G DDR2 module that I rootcaused a failure.

Sacrifice pointless 512M module to fix a much more useful 2G module?

Should add why I even want to repair this 512M module: because without it, I'd have an odd number of 512M modules... there's this machine that has three working 512M modules in it right now...

[stj]

Re: repairing traces...on a fine pitch board?

what a nice pointless repair! momaka will be proud! do post the link to this thread in the pointless repairs thread!

pointless?
do you know how expensive used dimms are becoming?

new stuff costs far less than used ddr or ddr2.

[eccerr0r]

Re: repairing traces...on a fine pitch board?

Don't worry I have another one i need to fix.

[ChaosLegionnaire]

Re: repairing traces...on a fine pitch board?

what a nice pointless repair! momaka will be proud! do post the link to this thread in the pointless repairs thread!