Uploaded April 2026 | Updated September 2026, 2 weeks ago

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Special thanks to PCBWay for sponsoring this video.
pcbway.com

In this episode of More Fun Fixing It, I tackle a batch of ZX Spectrum's suffering from missing voltage rails. I walk through my updated triage process using a diagnostic card to quickly identify dead 12V and -5V lines.

I dive into three specific repairs:
• Replacing shorted TR4 transistors (ZTX651) on Issue 2 boards.
• Identifying a failed -5V rail caused by out-of-spec electrolytic capacitors.
• Troubleshooting a "washed out" video signal by isolating a faulty LM1889N chip.

Along the way, I perform composite mods, tune the video output using an oscilloscope, and discuss the "harsh reality" of repair economics regarding recapping for resale.

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#ZXSpectrum #RetroRepair #Electronics