Michael Wright Posted September 10, 2018 Share Posted September 10, 2018 Would you guys help advise me as to how bad you think this is please? http://www.michaelwwright.com https://www.facebook.com MPN Paetron https://www.patreon.com/musicplayernetwork Link to comment Share on other sites More sharing options...
Markyboard Posted September 10, 2018 Share Posted September 10, 2018 First thing I would do is check continuity on every pin of the 74LS08 (IC31) chip using a multi-meter. That area looks to have the most corrosive damage. Chances are you'll have to remove that IC and solder in hard wires where the traces are open. The damaged nearby larger traces look to be much easier to repair. I'm not seeing anything here that can't be fixed by someone with half decent soldering skills. Link to comment Share on other sites More sharing options...
Markyboard Posted September 10, 2018 Share Posted September 10, 2018 There's plenty of info available on this exact issue with the Poly 6. One thing I failed to mention is you need to clean/neutralize the board of acid residue. Baking soda and/or maybe lemmon juice seems to be the recommended cleaner of choice. You will have to remove any chips where acid got underneath in order to adequately clean it. Also check for shorts between pins/ traces, not just opens. Good luck! Link to comment Share on other sites More sharing options...
MIDI2XS Posted September 10, 2018 Share Posted September 10, 2018 Would you guys help advise me as to how bad you think this is please? Bad enough. While I agree with Markyboard that the majority of the damage is near IC31, it certainly appears to encompass an area beyond that. Traces near IC23 and IC25 seem to be damaged, D15 and R91 show corrosion, and resistor pack R17 might have been affected - leaking electrolyte often gets into components via their leads. IC30 bears inspection as well. Good soldering skills would be needed, as well as experience in doing this type of repair. If I were working on this, the first thing I'd do is brush off any loose corrosion. The NiCd battery's electrolyte is alkaline, so washing the board with a weak acid (vinegar is often used) to neutralize it is a good idea, then rinse off with distilled water. Otherwise, my esperience is that after a repair any residue left from the battery can reactivate when the humidity is high, causing further problems. See http://www.oldcrows.net/~oldcrow/synth/korg/polysix/index.html Yamaha: Motif XF6 and XS6, A3000V2, A4000, YS200 | Korg: T3EX, 05R/W | Fender Chroma Polaris | Roland U-220 | Etc. Link to comment Share on other sites More sharing options...
The Real MC Posted September 10, 2018 Share Posted September 10, 2018 Even if you could clean it, the corrosion has done too much damage. It looks bad. Link to comment Share on other sites More sharing options...
MIDI2XS Posted September 10, 2018 Share Posted September 10, 2018 Even if you could clean it, the corrosion has done too much damage. It looks bad. Cleaning is just the first step. A skilled servicer can fix this, just not easily. Yamaha: Motif XF6 and XS6, A3000V2, A4000, YS200 | Korg: T3EX, 05R/W | Fender Chroma Polaris | Roland U-220 | Etc. Link to comment Share on other sites More sharing options...
Markyboard Posted September 10, 2018 Share Posted September 10, 2018 This may be a better option. Link to comment Share on other sites More sharing options...
Michael Wright Posted September 11, 2018 Author Share Posted September 11, 2018 Thanks guys. I had a bit of an idea about this, but I really don't have the electronic skills to tackle it. I think I have found a fellow to pass the torch to. Thank you very much again. Mike http://www.michaelwwright.com https://www.facebook.com MPN Paetron https://www.patreon.com/musicplayernetwork Link to comment Share on other sites More sharing options...
Markyboard Posted September 11, 2018 Share Posted September 11, 2018 I think I have found a fellow to pass the torch to. Thank you very much again. Mike If that doesn't work out and you send me just the pcb I'd be willing to take a crack at it. No guarantees but then no charge either. Link to comment Share on other sites More sharing options...
Michael Wright Posted September 11, 2018 Author Share Posted September 11, 2018 Thanks Markyboard! http://www.michaelwwright.com https://www.facebook.com MPN Paetron https://www.patreon.com/musicplayernetwork Link to comment Share on other sites More sharing options...
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