CPC 464 - Black Screen - LED OK - No bip - Dandanator OK but....

willow3411 · 16:40, 17 April 25

Hi all,
Another issue with a CPC 464.
On startup:
Black screen, no beep, and red LED on.
I tested the Z80 and the 40010. Result: the same.
So I connected the Dandanator to it with Romdiag 1.3.
LowRam test: OK
but ROM test: OK
It doesn't recognize the CPC at first, but more importantly, Romdiag crashes during the ROM test.
I replaced the 40009 ROM with an EEPROM flash, but the result is the same.
Any ideas?
Thanks
willow

McArti0 · 17:40, 17 April 25

Why are You testing DiagROM?

willow3411 · 18:00, 17 April 25

Quote from: McArti0 on 17:40, 17 April 25Why are You testing DiagROM?

I'm not testing Diagrom.
I'm using the program in Dandanator, but the ROM on the CPC 464 is 40009.
thanks
willow

McArti0 · 18:23, 17 April 25

But you used 1.3L (meaning low).

40009 is disabled

willow3411 · 18:32, 17 April 25

Quote from: McArti0 on 18:23, 17 April 25But you used 1.3L (meaning low).

40009 is disabled

which version should I use?

thanks
willow

McArti0 · 18:35, 17 April 25

1.3U for testing LowROM firmware.

willow3411 · 18:57, 17 April 25

ok
thanks

willow3411 · 19:14, 17 April 25

I will download the new version of the diagrom

willow3411 · 15:09, 18 April 25

Quote from: McArti0 on 18:35, 17 April 251.3U for testing LowROM firmware.

hello,

I can't find version 1.3U.

In .ROM or .bin format.

Do you have the file?

Thanks.

Willow

eto · 15:13, 18 April 25

Quote from: willow3411 on 15:09, 18 April 25I can't find version 1.3U.

it's in the release ZIP

https://github.com/llopis/amstrad-diagnostics/releases/tag/v1.3

willow3411 · 15:44, 18 April 25

Quote from: eto on 15:13, 18 April 25
Quote from: willow3411 on 15:09, 18 April 25I can't find version 1.3U.
it's in the release ZIP

https://github.com/llopis/amstrad-diagnostics/releases/tag/v1.3

Okay, thanks.
But it does exactly the same thing.
Whether it's with the Dandanator or a programmed ROM.
It crashes when reading the upper ROM and doesn't detect the lower ROM.
arghhh

willow3411 · 17:27, 18 April 25

Hi,
Okay, I'm making some progress...
Here I am, with a screen with vertical yellow stripes.
The ROM test with the Dandanator is fine.
See photo.
What do you think?
Thanks for your help.
Willow

McArti0 · 19:35, 18 April 25

With GA samething wrong?

Bryce · 22:57, 18 April 25

One of the multiplexers maybe?

Bryce.

willow3411 · 09:14, 19 April 25

Quote from: McArti0 on 19:35, 18 April 25With GA samething wrong?

@McArti0

Hello,

That's it, the solution has been found!!
Thanks to you.
I followed your reasoning and looked into the GA.
The CI socket was corroded.
I replaced it and everything is fine now.

We can say problem SOLVED!!
Thanks again to the entire community for responding.
Willow

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CPC 464 - Black Screen - LED OK - No bip - Dandanator OK but....