Three FAULTY ZX Spectrums and a Diagnostic Cartridge = bad ULA
26:20
Bad RAM - ZX Spectrum repair
18:33
I Drilled this MSI RX 6900XT and It Works - Very rare problem #krisfix #6900xt
15:46
Why is my ZX Spectrum Faulty?
13:53
A Weird Chip Inside This ZX Spectrum.
14:41
Crazy RAM Failure Mode! - ZX Spectrum Repair with Explanations
14:50
Fixing Bad Video Quality on the Sinclair ZX Spectrum
24:54
ZX Spectrum 128K "Toastrack" Repair and Jailbar Reduction
23:31