Hobbyist or repairer · for advanced
Garbled Screen! Amstrad CPC 464 Video Failure
About this video
Why does an Amstrad CPC 464 show a garbled screen? Noel's first suspect, the CRT controller, turns out to be wrong, and the hunt moves through power, the gate array, ROM, Z80 and RAM.
Good to know: Board level fault finding. Replacing chips means soldering: burns and fumes, and old solder contains lead.
Why watch it
Includes an explanation of how the CPC generates its video and the usual RAM failure patterns, with chapters to jump between them.
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