The Macintosh IIsi and LC series are known to have power supplies that tend to fail. Instead of rolling the dice by trying to recap and clean your original PSU, let's take a look at two options that offer guaranteed success and minimal hassle (with a bonus option for if you hate yourself).

Links:
CayMac Vintage Power-Up-IIusi PCB kit for Mac IIsi: https://ko-fi.com/s/e75a010465
With it, you'll also need the following...
Power supply module for IIsi (affiliate link): https://amzn.to/3YgXPMT
ATX pico PSU for IIsi (affiliate link): https://amzn.to/3Nl2gjx

CayMac Vintage Power-Up-Pizza PCB kit or LC series: https://ko-fi.com/s/fc8716098b
With it, you'll also need the following...
Power supply module for LC-series (affiliate link): https://amzn.to/3Y1hmPX
ATX pico PSU for LC-series (affiliate link): https://amzn.to/3Nl2gjx

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Music by Epidemic Sound (https://www.epidemicsound.com).
Intro music by BoxCat Games (https://freemusicarchive.org/music/Bo....