Sinclair ZX Spectrum +2 Repair

I'm troubleshooting and repairing a grey Sinclair ZX Spectrum +2 that displays a garbage screen. // Kindly sponsored by PCBWay - Get your first PCBs free! - https://www.pcbway.com/ Keysight DSOX1204G Oscilloscope: https://www.keysight.com/de/pdx-2969966-pn-DSOX1204G/oscilloscope-70-100-200-mhz-4-analog-channels TL866 EPROM Programmer*: US: https://amzn.to/3b8OmNQ UK: https://amzn.to/3deVM52 DE: https://amzn.to/3rWXAUq ZX Spectrum Diagnostics: https://github.com/brendanalford/zx-diagnostics/wiki DivMMC Future: https://www.thefuturewas8bit.com/shop/sinclair/divmmcfuture.html Desoldering Station ZD-915*: DE: https://amzn.to/3jPh8qC UK: https://amzn.to/3rU7WnL Hot Air Station 858D*: US: https://amzn.to/2NuWzUh UK: https://amzn.to/2N6vjMe DE: https://amzn.to/2OFFpUP Jonard Tools EX-2 IC Extractor*: US: https://amzn.to/3baJS9q 78S05 Voltage Regulators*: UK: https://amzn.to/2NrI4AK DE: https://amzn.to/3psxgjm * 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 0:45 Sponsor Message 1:20 Disassembly 4:19 Replacing the voltage regulator 6:12 Tapping into the composite signal 8:04 Initial Testing 9:21 Testing Reset 10:11 Investigating faulty RAM 14:14 Replacing first RAM chip 15:37 RAM Troubleshooting with Diagnostic ROM 19:10 Running full Diagnostics 25:09 Testing with original ROM 26:42 Thank you & Goodnight ----------------------------------------­------ 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. My Oscilloscope was kindly provided by Keysight. #JanBeta #Sinclair #ZXSpectrum #PCBWay