Another quick(ish) vintage computer repair.
This poorly Sinclair ZX Spectrum has a corrupted display. Bad RAM? CPU?
Capacitors?!?! Maybe!
Initial checks video
https://youtu.be/IzgCmldm2H4
Website
https://www.morefunmakingit.co.uk/
My Twitterings can be found here
https://twitter.com/ZZleeZZ
Discord Channel
https://discord.gg/FvWEhV9
Ko-fi page
https://ko-fi.com/morefunmakingit
Amazon Wishlist
https://www.amazon.co.uk/hz/wishlist/ls/I5EGNMXIW5PC?ref_=wl_share
Patreon
https://www.patreon.com/morefunmakingit
00:00 Introduction
00:39 We're going in!
01:47 Mostek CPU
02:20 Checking resistance
02:35 Removing the Voltage Regulator and Transistors TR4 and TR5
03:33 Powering on
03:53 Composite mod
04:53 Powering on (Again)
05:31 Checking Voltages (and a slip)
06:38 Replacing the Capacitors
06:50 A Clumsy Mistake
08:54 Testing
09:13 More Recapping
09:37 Testing and Success!
10:00 Finish the Recap
12:12 Replace TR1 and TR2 Transistors
12:56 Screen Test
13:15 Put it Back Together
13:37 Testing with CRT and loading Jetpac
14:08 Check Scraped Trace
15:19 Goodbye!
#zxspectrum #computerrepair #sinclairzxspectrum