A Very Faulty ZX Spectrum!

Repairing a ZX Spectrum 48KB with 5 different faults hidden away!
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Thanks PCBWay for sponsoring this video: https://pcbway.com/g/M525r4

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For your ZX Spectrum (and more) spares, take a look at Retroleum UK
https://retroleum.co.uk/

Diagnostic ROM
http://blog.retroleum.co.uk/electronics-articles/a-diagnostic-rom-image-for-the-zx-spectrum/

Take a look at Lee's channel for more Speccy fun @MoreFunMakingIt

https://projectspeccy.com/ for tons of Spectrum projects

BitFunx store I do NOT recommend: https://www.aliexpress.com/store/1102904327

00:00 Intro
02:20 Overview
04:08 PSU test
05:34 Composite mod
06:23 Power up
07:38 Diagnostic ROM
10:10 Troubleshooting
11:24 ULA replacement
12:26 RAM issue 1
13:10 Thermal analysis
14:15 Capacitor replacement
19:45 RAM issue 2
22:26 RAM issue 3
24:39 DC-DC mod
25:57 Speaker test
31:21 Video adjustment
33:25 Running software
34:28 Speaker replacement and final test
36:05 Cleaning and reassembling
36:34 Outro

Видео A Very Faulty ZX Spectrum! канала Tony359 | Tony's Tinkering Shop