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Author Topic: Amiga 4000 no video using A520  (Read 1591 times)

Description: Video sync

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Offline hcoderTopic starter

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Amiga 4000 no video using A520
« on: April 24, 2023, 07:32:22 PM »
Hi,

I'm in the middle of a recap process and I changed a few caps. They all measure OK and everything seems fine.
I'm using an A4000, 030 and Chipmem. The rest is all unplugged. The motherboard is removed from the case and placed on my desk.

When I first booted the machine it all went to the kickstart screen (OS 3.1) and the floppy was inserted a few times.
Suddenly the screen turned funny and then to black.

When I turn the machine off and back on this is what I can see:

1: The TV receives a signal, it shows a black screen
2: After about 30 seconds (the moment of the kickstart screen?) the screen changes to darker black with a moving white bar moving from bottom to up, repeats
3: That's it.

The A520 I'm using is 100% as my A1200 works perfectly with it.

Anyone has a clue what might be the problem?
Every reboot results in the above problem.
« Last Edit: April 24, 2023, 07:45:42 PM by hcoder »