Jan Beta | C64 Scrambled Video Repair @JanBeta | Uploaded June 2020 | Updated October 2024, 7 hours ago.
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! - 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: derbian.webs.com/c64diag
Ray Carlsen's troubleshooting and repair guides are here: personalpages.tds.net/~rcarlsen/cbm.html
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): blog.worldofjani.com/?p=164
Here's the GitHub with Sven's diagnostics harness: github.com/svenpetersen1965/C64-Diagnostic-Rev.-586220-Harness
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!
----------------------------------------------
EQUIPMENT AND TOOLS I USE: kit.co/janbeta *
TWITTER: twitter.com/thejanbeta
PATREON: patreon.com/janbeta
WEBSITE: janbeta.net
TWITCH: twitch.tv/thejanbeta
LBRY: open.lbry.com/@janbeta:b
YT CHANNEL MEMBERSHIP: youtube.com/channel/UCftUpOO4h9EgH0eDOZtjzcA/join
Thanks for watching!
* 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 #PCBWay
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! - 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: derbian.webs.com/c64diag
Ray Carlsen's troubleshooting and repair guides are here: personalpages.tds.net/~rcarlsen/cbm.html
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): blog.worldofjani.com/?p=164
Here's the GitHub with Sven's diagnostics harness: github.com/svenpetersen1965/C64-Diagnostic-Rev.-586220-Harness
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!
----------------------------------------------
EQUIPMENT AND TOOLS I USE: kit.co/janbeta *
TWITTER: twitter.com/thejanbeta
PATREON: patreon.com/janbeta
WEBSITE: janbeta.net
TWITCH: twitch.tv/thejanbeta
LBRY: open.lbry.com/@janbeta:b
YT CHANNEL MEMBERSHIP: youtube.com/channel/UCftUpOO4h9EgH0eDOZtjzcA/join
Thanks for watching!
* 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 #PCBWay
