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Started by Curlypaul, 03:28, 19 January 22
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Quote from: Bryce on 11:43, 19 January 22New PSU... always a suspect. What's its (claimed) ratings?Bryce.
Quote from: Skunkfish on 14:55, 19 January 22Hi Paul, I'm a bit worried that might be the GX4000 PSU that was purchased off me? Hopefully not as that's 9V and 1.6A! Thanks, James.
Quote from: Curlypaul on 14:43, 30 January 22ok so I took the gate array out as it there was thermal paste all over the place and gave it all a good clean. Still seem to have 5v everywhere apart from accross the gate array. With the gate array removed the socket does have 5v across the pins, not sure if this is a red herring or not.Would be useful if I had another machine to test with
Quote from: Joseman on 17:37, 30 January 22HiMaybe test what are the ohms between the gate array ground and the other pins outside the board?
Quote from: Curlypaul on 19:12, 30 January 22You mean maybe the resistors on the 5v in?Just snagged an aparently working motherboard, probably overpaid, but I wanted to be sure it had the 40007 the same as mine. Mine doesn't have the thick white factory bodge wires, but I'm assuming that's not an issue so long as the chip part numbers match.
Quote from: Joseman on 19:17, 30 January 22no, i was thinking that if you check the pin ground on the gate array itself with all other pins of the gate array, well it have to show some results... now that you have 2 GA you can check it the two gate array bring the same results on all this values. I have little knowledge but maybe is a step.
Quote from: CurlypaulI came to test my new 512kb ram board and find my CPC464 has developed a fault, showing a garbled screen.It changes, but mainly it's blue and yellow vertical rectangles or light green columns, and very occasionally, a crazy vsync. The prevelance of blue and yellow suggests some sort of initialisation is happening?
Quote from: Nworc on 23:02, 02 February 22Cool, nice picture!To me the picture looks like the display of uninitialized RAM. I saw something similar as I played around with the CPU hardware wise. Maybe the CPU is not working, maybe the RAM is not powered.
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