Building a ZX Spectrum diagnostics card to try to fix my ZX Spectrum Plus

I build a ZX Spectrum diagnostics cartridge to continue with another attempt of repairing the ZX Spectrum plus
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This is part 2 of attempting to fix my ZX Spectrum+. Do I finally fix it this time ?

Part 1: https://youtu.be/JDCyBYtyzvg

Contents:

0:00 Intro
3:32 The vLA82 chip
4:27 Building the diag cart
19:05 Testing the diag cart
23:42 Testing the broken machine
25:54 Repairs
38:56 Conclusion

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Видео Building a ZX Spectrum diagnostics card to try to fix my ZX Spectrum Plus канала Arctic retro