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I’ve moved this topic into the ZX Spectrum Hardware area.
The good news is that it looks like the Z80, the ROM, the ULA and most of the RAM is working. But after doing it’s memory check and trying to set the system up, the Z80 is crashing. It could be a fault with the upper RAM.
Do you have any test gear, such as a digital multimeter? Logic probe, or oscilloscope?
And are you able to solder?