Uploaded August 2025 | Updated September 2026, 2 weeks ago

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A huge thank you to the sponsor of this video pcbway.com

This ZX Spectrum arrived with serious display issues, and the culprit turned out to be the U21 chip. In this video I track down the fault, replace the bad part, and bring the machine back to life.

If you’re into Sinclair ZX Spectrum repairs, retro computing, or just like seeing old 8-bit hardware restored and working again, this repair should be right up your street.


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