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 PowerUpIIusi PCB kit for Mac IIsi: https://kofi.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'>https://amzn.to/3Nl2gjx

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