A1200 arrived with black screen

Ninjafahrer · 23 March 2021, 21:09

Hi,
I ve recently got an A1200 Rev 1D4 which arrived with black screen.

I disconnected everything, but mouse and screen via Scart and put diagrom in it. With Diagrom it booted but i have no Audio - its clicking sometimes.
Interfaces, IRQs are working. Floppy disc control is working as well, but when I click on "Show first read sector" I am getting an error "error reading sector" which is strage as I have a working Gotek connected.

Sometimes I have distorsion in the picture and after the start green, or blue lines are showing up at the screen.

Most of the caps - beside the 1000uf ones I ve changed already, but no change in behaviour.

mart1n · 31 March 2021, 00:29

Did you replace the caps due to leakage? If yes - Have you checked continuity to all of the pads? amigapcb.org is a great resource for this.

R4M · 31 March 2021, 02:25

But still all of this does not explain a black screen. Did you do a memory test?

Ninjafahrer · 21 April 2021, 21:28

I found 2 errors. The OpAmp and Paula were not ok.

The Amiga lives again.

23 March 2021, 21:09	#1
Ninjafahrer Registered User Join Date: Feb 2021 Location: Berlin Posts: 7	A1200 arrived with black screen Hi, I ve recently got an A1200 Rev 1D4 which arrived with black screen. I disconnected everything, but mouse and screen via Scart and put diagrom in it. With Diagrom it booted but i have no Audio - its clicking sometimes. Interfaces, IRQs are working. Floppy disc control is working as well, but when I click on "Show first read sector" I am getting an error "error reading sector" which is strage as I have a working Gotek connected. Sometimes I have distorsion in the picture and after the start green, or blue lines are showing up at the screen. Most of the caps - beside the 1000uf ones I ve changed already, but no change in behaviour.

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31 March 2021, 00:29	#2
mart1n Registered User Join Date: Feb 2021 Location: Stockholm Posts: 18	Did you replace the caps due to leakage? If yes - Have you checked continuity to all of the pads? amigapcb.org is a great resource for this.

31 March 2021, 02:25	#3
R4M Registered User Join Date: Jan 2019 Location: /home Posts: 122	But still all of this does not explain a black screen. Did you do a memory test?

21 April 2021, 21:28	#4
Ninjafahrer Registered User Join Date: Feb 2021 Location: Berlin Posts: 7	I found 2 errors. The OpAmp and Paula were not ok. The Amiga lives again.

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