Jan Beta | Sinclair ZX Spectrum+ Garbage Screen Repair @JanBeta | Uploaded July 2020 | Updated October 2024, 5 hours ago.
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 gee-k.net (check out the website for tons of vintage computer tinkering and more).
You can watch my restoration of this Spectrum+ here: youtu.be/dYJ9Akv58D0
My ZX Spectrum composite mod tutorial video: youtu.be/5oFMaI7nqPU
The DivMMCfuture is available from The Future Was 8-Bit here: thefuturewas8bit.com/shop/sinclair/divmmcfuture.html
The MeanWell power supply I used is available here* (REMEMBER TO REVERSE THE POLARITY!):
US: amzn.to/2lKv4sb
UK: amzn.to/2li2tdC (a slightly higher rated one)
DE: amzn.to/2kcaEaY
The ZX Spectrum Diagnostics software is available here: 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): usebox.net/jjm/return-of-traxtor
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Music by Focus 10 soundcloud.com/user-993847645
EQUIPMENT AND TOOLS I USE: kit.co/janbeta *
TWITTER: twitter.com/thejanbeta
PATREON: patreon.com/janbeta
WEBSITE: janbeta.net
TWITCH: twitch.tv/thejanbeta
LBRY: open.lbry.com/@janbeta:b
YT CHANNEL MEMBERSHIP: youtube.com/channel/UCftUpOO4h9EgH0eDOZtjzcA/join
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
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 gee-k.net (check out the website for tons of vintage computer tinkering and more).
You can watch my restoration of this Spectrum+ here: youtu.be/dYJ9Akv58D0
My ZX Spectrum composite mod tutorial video: youtu.be/5oFMaI7nqPU
The DivMMCfuture is available from The Future Was 8-Bit here: thefuturewas8bit.com/shop/sinclair/divmmcfuture.html
The MeanWell power supply I used is available here* (REMEMBER TO REVERSE THE POLARITY!):
US: amzn.to/2lKv4sb
UK: amzn.to/2li2tdC (a slightly higher rated one)
DE: amzn.to/2kcaEaY
The ZX Spectrum Diagnostics software is available here: 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): usebox.net/jjm/return-of-traxtor
----------------------------------------------
Music by Focus 10 soundcloud.com/user-993847645
EQUIPMENT AND TOOLS I USE: kit.co/janbeta *
TWITTER: twitter.com/thejanbeta
PATREON: patreon.com/janbeta
WEBSITE: janbeta.net
TWITCH: twitch.tv/thejanbeta
LBRY: open.lbry.com/@janbeta:b
YT CHANNEL MEMBERSHIP: youtube.com/channel/UCftUpOO4h9EgH0eDOZtjzcA/join
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
