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Troubleshooting and repairing a Sinclair ZX Spectrum+ (issue 4A mainboard) that displays flashing garbage patterns on screen and does not properly start up. The Speccy was kindly donated by https://www.gee-k.net (check out the website for tons of vintage computer tinkering and more). You can watch my restoration of this Spectrum+ here: • Sinclair ZX Spectrum+ Restoration & F... My ZX Spectrum composite mod tutorial video: • ZX Spectrum 48k Easy Composite Mod The DivMMCfuture is available from The Future Was 8-Bit here: https://www.thefuturewas8bit.com/shop... The MeanWell power supply I used is available here* (REMEMBER TO REVERSE THE POLARITY!): US: https://amzn.to/2lKv4sb UK: https://amzn.to/2li2tdC (a slightly higher rated one) DE: https://amzn.to/2kcaEaY The ZX Spectrum Diagnostics software is available here: https://github.com/brendanalford/zx-d... The (brilliant!) Return of Traxtor game you see me playing during the credits is available from the author's website here (among many others): https://www.usebox.net/jjm/return-of-... -------------------------------------------- Music by Focus 10 / user-993847645 EQUIPMENT AND TOOLS I USE: https://kit.co/janbeta * TWITTER: / thejanbeta PATREON: / janbeta WEBSITE: https://www.janbeta.net TWITCH: / thejanbeta LBRY: https://open.lbry.com/@janbeta:b YT CHANNEL MEMBERSHIP: / @janbeta 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). TIME STAMPS: 0:00 Introduction 1:46 Disassembly & Inspection 7:08 Composite Mod 10:10 Power Supply 10:41 Garbage Screen 11:08 Cleaning RCA Connector 11:35 Checking the Voltages 14:05 Replacing the Voltage Regulator 17:58 Different Garbage! 18:23 ULA Fault? 20:53 Piggybacking RAM 24:00 Replacing RAM & Touching up Solder Joints 31:15 Testing 31:53 Replacing the Keyboard Membrane 34:28 Final Testing 36:28 Thank you & Goodbye #JanBeta #ZXSpectrum #Retrocomputing