Trying to repair a badly broken and incomplete NTSC Commodore VIC-20 board.

TFw8b Penultimate Cartridges (I used the +3 dcr here): https://www.tfw8b.com/product/penultimate/

VIC-20 Diagnostic Cartidge and Harness from Sven Petersen: https://github.com/svenpetersen1965/VIC-20_Diagnostics

Tynemouth Software Blog about the Diagnostics: http://blog.tynemouthsoftware.co.uk/2016/05/vic20-diagnostics-user-guide.html

TIME STAMPS: 0:00 Introduction 1:04 Replacing missing Components 11:42 Smoke Test 12:02 Testing Voltages 13:21 Replacing Q4 Transistor 15:38 Testing Socketed ICs 21:03 Just a broken VIC? 25:27 VIC-20 Diagnostic Cartridge 28:41 ROM Fault? 29:29 Bad Diagnostics? 36:28 Thank you & Good night

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