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| Recapping a second SE/30 |
Posted by: cannfoddr on 2021-01-31 07:46:44
Whilst waiting for my UF8s to arrive for the board with no V-Sync I cracked open my (mostly) working SE/30 and pulled out the logic board for its recap. This is my second attempt.
It mostly went a lot smoother this time all the can capacitors off with no damaged pads using a cheap hot air station. One or two got a bit lively. I applied Kapton tape to all the potentially vulnerable plastic bits. Still had trouble with my old nemesis C2 the negative side sits on a huge bit of copper and is real pain to heat up. I got the Cap out with some difficulty but then discovered the replacement didn't fit in the hole, I then spent way too long and way too many attempts with solder braid trying to clear out the hole. Eventually I got the raining traces of solder out.
I recapped with 50v Tantalums as per JDWs recent post.
Board had no startup chime, I spent some time cleaning up the UEs and other chips that all looked like they had seen some cap leakage. No obvious signs of damage.
Board is now having a well deserved IPA soak following a thorough scrubbing with some anti-static brushes.
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Posted by: joshc on 2021-02-02 00:31:47
A couple of steps that are easy to do: double check for broken traces, some are very hard to spot. And make sure everything is squeaky clean. Re-check your solder joints on all replaced caps.
Would recommend a desoldering station for the next board you have to do - really helps with any through holes that are on ground planes.
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Posted by: cannfoddr on 2021-02-04 05:51:55
So the recap is complete. The board has had 3 days to dry out - no smell of IPA. I re-assembled everything this evening and powered on, everything seems to be working plus the sound is now working again. A complete success.
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Posted by: moldy on 2021-02-05 02:43:22
@cannfoddr which ICs did you end up replacing in the end? or just a recap was enough?
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Posted by: cannfoddr on 2021-02-05 11:31:33
For the sound the recap and a good clean were all that was needed
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