Episode 8: C128 Black Screen Diagnostic and Repair

In this video, I diagnose an unresponsive C128. It shows a black screen, but the board has power. You'll see me use a multimeter and logic probe to try to find the problem, and it turned out to be in the last place I would have considered...

Special thanks to Michael Myers and the Commodore International Historical Society Facebook page for the deal on the 128. Find their page here: Facebook: commodoreinternationalhistoricalsociety

Thanks also to John Saller, for the part (spoilers!) that brought it back to life.

Part II of the restoration is here: Episode 9: Commodore 128 Restoration,...
Mentioned in the video:
Commodore 128/128D Diagnostic Instruction and Troubleshooting Manual: https://archive.org/details/C128_Diag...

Service Manual, C-128/C128D Computer: https://archive.org/details/Service_M...

I’m on many of the Commodore groups on Facebook, notably the Commodore 8-Bit Repair and Upgrades page, which I started: Facebook: 1954758181300269

Music:
Ryan Andersen, "Lift It Up": http://freemusicarchive.org/music/Rya...
A Smile for Timbuctu, "Il Circo Smorfioso": http://freemusicarchive.org/music/A_S...

Please consider making a donation on my Patreon page. I’m just doing this because I enjoy it, but hardware prices keep going up, and spares and replacement parts aren’t cheap. Your donation will be used exclusively to buy what I need to keep making content for this channel. Thank you!
Patreon: CommodoreRestore

• #science_technology
• #commodore
• #128
• #c128
• #repair
• #restore
• #black_screen
• #troubleshooting