The pile of five mostly broken ZX Spectrums is reduced by another one!

In this episode, I manage to track down the fault using a combination of diagnostic testing tools and an oscilloscope. Faulty ram chips can sometimes trash the system so badly it's just about impossible to track down the fault without removing components (see the next one in this series for a great example of this!).

I never claim to be an expert, and I don't want that label. It carries too much responsibility. The purpose of my channel is to share my journey. If you accidentally learn something that's all on you.

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00:00 Introduction
01:17 In We Go!
04:26 TR4 Testing BAD
05:48 First Switch on
06:00 Dandanator Diagnostics
06:45 Test ULA
07:12 Broke the ULA Socket!
08:34 Replace ULA Socket!
10:35 This Week in Retro Dave
11:53 Oscilloscoping We Go!
15:48 Removing IC19 Upper Ram
16:18 Lost a Pad!
17:23 Testing Upper Ram IC19
18:07 Removing the ROM
20:15 Lost ANOTHER Pad!
22:59 Diagnost ROM Testing
23:30 Removing IC10 Lower Ram
24:49 Testing IC10
26:49 Working Machine! Mostly...
29:42 Faulty Speaker
32:04 FINAL Testing
33:50 Goodbye!













#zxspectrum #computerrepair #sinclairzxspectrum

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