Sinclair ZX Spectrum+ Garbage Screen Repair
1,507Troubleshooting 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: https://youtu.be/dYJ9Akv58D0
My ZX Spectrum composite mod tutorial video: https://youtu.be/5oFMaI7nqPU
The DivMMCfuture is available from The Future Was 8-Bit here: https://www.thefuturewas8bit.com/shop/sinclair/divmmcfuture.html
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-diagnostics/wiki
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-traxtor/
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Music by Focus 10 https://soundcloud.com/user-993847645
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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
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