Restoring a Commodore 64 — Smiggy's Retro Workshop

There's nothing quite like powering on a Commodore 64 for the first time after a full restoration. As Smiggy, I've been tinkering with vintage computers in my workshop here in Rainhill, UK for years, and the C64 remains one of my all-time favourites.

The Find

I picked this one up at a car boot sale in St Helens for just £15. The case was yellowed, the keyboard membrane was shot, and it wouldn't power on. Perfect project material for Smiggy's retro bench!

Step 1: Full Teardown

First things first — complete disassembly. Remove all screws from the bottom case, carefully disconnect the keyboard ribbon cable, and lift out the motherboard. I always photograph each step so I can reference it later.

Step 2: Visual Inspection

The board had some corrosion around the power regulator area — a common issue with C64 boards stored in damp UK garages. Several electrolytic capacitors looked bulged. Time for a full recap.

Step 3: Capacitor Replacement

I replaced all electrolytics with modern equivalents. The key caps to replace on a C64 board are the ones near the SID chip and the power section. I used Panasonic FR series — reliable and affordable.

Step 4: Power Supply Safety

NEVER use the original C64 power supply without testing it first! The 5V rail on old C64 PSUs can go overvoltage and destroy the chips. I built a simple overvoltage protection circuit — a project I'll detail in a future Smiggy electronics tutorial.

The Result

After recapping, cleaning the cartridge port with IPA, and retrobright-ing the case, this C64 boots perfectly. The SID chip even works — time to load up some classic tunes! Another successful restoration from Smiggy's retro computing workshop in Rainhill.