Stubborn C64 Repair

Video Description

I'm working on another Commodore 64 with a severe case of black screen. Not even the Dead Test cart gives me any reading! Am I going to be able to repair this? // Kindly sponsored by PCBWay - Get your first PCBs free! - https://www.pcbway.com/ C64 Troubleshooting Resources: https://janbeta.net/c64-resources/ Noel's recent C64 Repair videos (Part 1 & 2): https://youtu.be/8Bu_VMoiEIg XCPLA PLA Replacement: https://www.hackup.net/2019/06/the-xcpla-yet-another-pla-replacement/ PDF version of the C64 Programmer's Reference Guide: https://www.commodore.ca/manuals/c64_programmers_reference/c64-programmers_reference.htm Desoldering Station ZD-915*: DE: https://amzn.to/3jPh8qC UK: https://amzn.to/3rU7WnL TIME STAMPS: 0:00 Intro 1:53 Sponsor Message 2:18 First Inspection 4:24 Dead Test 7:08 Measuring Voltages 9:06 Finger Test 9:27 Shorted Kernal ROM 10:31 Broken RAM 14:00 Multiplexers? 16:00 Wonky Address Lines (A Red Herring) 18:46 PLA? 20:10 More Broken RAM? 21:40 CPU? 24:29 Even more broken RAM! 26:15 Comparing with a good C64 27:06 Replacing more RAM 28:10 U14 Logic? BASIC ROM? 29:30 Replacing ALL the RAM 30:23 Reset Circuit? 35:06 The Solution! 36:22 Final Tests 39:01 What was broken? 40:53 Reassembly 41:23 Thank you & Good Night ----------------------------------------­------ MUSIC by FOCUS 10 https://focus10music.bandcamp.com EQUIPMENT AND TOOLS I USE: https://kit.co/janbeta * TWITTER: https://twitter.com/thejanbeta PATREON: https://patreon.com/janbeta WEBSITE: https://www.janbeta.net TWITCH: https://www.twitch.tv/thejanbeta YT CHANNEL MEMBERSHIP: https://www.youtube.com/channel/UCftUpOO4h9EgH0eDOZtjzcA/join Thanks for watching! This video was sponsored by PCBWay. * Stuff marked with "*" contains affiliate links. You don't pay anything extra and I get a little commission from everything you buy through the links (even if you buy something different there). #JanBeta #Commodore #C64 #Repair #PCBWay