I did a full LED conversion of my Indiana Jones using Comets:
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I hadn't been sure I'd want to upgrade it before, but it's definitely much lighter and brighter now... all went well until the very last #555 bulb on the last PCB on the mini playfield which was completely jammed in. In the end I crushed it and spent 20 minutes scraping and picking bits of glass out of it, not very therapeutic
I also installed a mode scoop mod from free-play.se to try to minimise rejects which were consistently running around 50% - it seems to be down to 10% now on initial testing, the only issue was I had to trim the plastic above the scoop due to the increased thickness which was a pain!
I also fixed a switch issue which was caused by a crushed diode under the mini playfield... hopefully that scoop mod will prevent any more of that nonsense.
That just leaves the DMD... to go colorDMD or keep it original?