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 [ Ссылка ] (check out the website for tons of vintage computer tinkering and more).

You can watch my restoration of this Spectrum+ here: [ Ссылка ]

My ZX Spectrum composite mod tutorial video: [ Ссылка ]

The DivMMCfuture is available from The Future Was 8-Bit here: [ Ссылка ]

The MeanWell power supply I used is available here* (REMEMBER TO REVERSE THE POLARITY!):
US: [ Ссылка ]
UK: [ Ссылка ] (a slightly higher rated one)
DE: [ Ссылка ]

The ZX Spectrum Diagnostics software is available here: [ Ссылка ]

The (brilliant!) Return of Traxtor game you see me playing during the credits is available from the author's website here (among many others): [ Ссылка ]

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Music by Focus 10 [ Ссылка ]

EQUIPMENT AND TOOLS I USE: [ Ссылка ] *
TWITTER: [ Ссылка ]
PATREON: [ Ссылка ]
WEBSITE: [ Ссылка ]
TWITCH: [ Ссылка ]
LBRY: [ Ссылка ]

YT CHANNEL MEMBERSHIP: [ Ссылка ]

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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