Tag Archive | PCB repair

MAME cabinet, more video “fun”..

..and maybe moreover “video related electronics “fun””. Whilst installing the SCART switcher to the cabinet, I managed to swing the tv tube assembly carelessly.

*CRUNCH* .. “Hmm, now that didn’t sound too good”

Peeking inside the cabinet, it turned out that the electronics board of the telly had gotten stuck between the tilting mechanism of the tube assembly and thus swinging it fractured the board. End result: About 20 damaged conductors on the solder side of the board.

This is how your own DIY might make you feel every now and then

Read More…

Advertisements

Korg Polysix board repairs

A defunct Korg Polysix inbound for repairs.. Prior to getting my hands on the synth I briefly checked the net for schematics and typical faults. The owner had taken a look inside and noticed a leaked battery, so I knew a little bit what to expect.. Seemingly, battery leakage is a pretty common root cause for faults in the Polysix.

Among the top search results was Scott Rider’s Polysix repair page. Here, the battery leak repair procedure is described well in detail so do take a look at this if interested. Much thanks to this article, I was even more well-prepared beforehand :)

Eventually, the synth appears at my desk..

Polysix, case open

Open up..

Polysix, battery leakage

Some mess around IC30 & IC 31. Battery removed already.

Nothing even remotely as bad as in Scott’s example, just a few damaged traces under IC31 and a bit of dirt in the near vicinity (namely, IC30).

Whilst removing IC30 & IC31 for the trace repairs, I decided to install sockets for both chips despite there wasn’t any damage under IC30. Clean up and trace repairs took a while longer than expected, but nothing really problematic. Before soldering in the sockets, I checked the repaired traces for continuity and afterwards for short-circuits.

Polysix, foil repairs

Repaired traces running under socket of IC31.

Polysix, new battery

New battery installed.

Seems I got lucky as there isn’t anything else to repair.. Off it goes, yay \o/