C64 Scrambled Video Repair

Описание: Troubleshooting and repairing another Commodore 64 board (ASSY 250425) with a weird scrambled characters/flickering lines fault. // Kindly sponsored by PCBWay - Get your first PCBs free! - https://www.pcbway.com/

The IC puller I'm using is a Jonard Tools EX-2, available from various electronics resellers.

Here's some handy resources I refer to when troubleshooting and repairing C64s:

The Pictorial C64 Fault Guide is here: http://derbian.webs.com/c64diag/

Ray Carlsen's troubleshooting and repair guides are here: http://personalpages.tds.net/~rcarlse...

You can get the .bin files for various C64 diagnostics cartridges from World of Jani (in case you want to make your own or try in an emulator): http://blog.worldofjani.com/?p=164

Here's the GitHub with Sven's diagnostics harness: https://github.com/svenpetersen1965/C...

Time stamps:
0:00 Introduction
1:43 Fixing bent Keyboard Connector
2:42 Testing Voltages
5:23 Populating the Board
8:17 Initial C64 Test
9:33 Jupiter Lander Distorted Picture
10:45 Fixing the Cartridge Port
12:31 About the Ultimax Cartridge Mode/More Fixing
18:45 Scrambled Character Issues
21:03 Broken VIC-II?
24:09 Power Issues
28:34 It's not the VIC-II!
34:36 MOS7801 Broken?
35:49 U14 Logic Broken?
38:17 More Testing
39:28 Replacing U14 74LS258 Logic
43:51 More Testing, More Cleaning
44:50 Another Logic Chip? 74LS373
49:32 Thank you and Good Night!

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