Amiga 2000 display issues

tomead · 09 January 2015, 15:33

My luck in getting a working Amiga 2000 seems to be getting no better My spare board that I bought of ebay now has a display issue. The output from RGB and the scandoubler are not right. Not easy to describe so taken some pictures. Anyone have any ideas as to what is wrong. Have already swapped the Denise from a A500 no change in the display.

majsta · 10 January 2015, 13:13

I have one A600 and by just looking to you pictures it looks to me that it is the same problem. Like you said it is not possible to describe problem just by looking to the pictures but if I found the problem on my A600 I ll report how I fixed it so that could be nice starting point to resolve your problem.

Hewitson · 11 January 2015, 13:24

Does the machine work? What happens to the graphics if you run a game?

tomead · 11 January 2015, 17:44

Here is a picture of the motherboard running Cool spot. Not sure if one RGB colour is missing or it is an issue with the agnus or its socket.

Jope · 11 January 2015, 19:02

More like something wrong with the data or address bus. If a colour component was missing, you wouldn't get white or grey.

tomead · 11 January 2015, 20:13

Just Checked the black and white composite output. Got a rolling screen on the rgb monitor. Tried on lcd tv get no signal. Connected an amiga 500 up same way get correct b/w composite signal on TV and RGB monitor.

One signal for display not present i think !!

tomead · 13 January 2015, 19:41

As it has been suggested that the issue may be a address decoding issue. I have swapped Gary for a known good part and no change. Anbody able to give any hints as to troubleshoot this.

09 January 2015, 15:33	#1
tomead tomead Join Date: Feb 2010 Location: Chichester Age: 45 Posts: 71	Amiga 2000 display issues My luck in getting a working Amiga 2000 seems to be getting no better My spare board that I bought of ebay now has a display issue. The output from RGB and the scandoubler are not right. Not easy to describe so taken some pictures. Anyone have any ideas as to what is wrong. Have already swapped the Denise from a A500 no change in the display. Attached Thumbnails

11 January 2015, 17:44	#4
tomead tomead Join Date: Feb 2010 Location: Chichester Age: 45 Posts: 71	Here is a picture of the motherboard running Cool spot. Not sure if one RGB colour is missing or it is an issue with the agnus or its socket. Attached Thumbnails

11 January 2015, 20:13	#6
tomead tomead Join Date: Feb 2010 Location: Chichester Age: 45 Posts: 71	Just Checked the black and white composite output. Got a rolling screen on the rgb monitor. Tried on lcd tv get no signal. Connected an amiga 500 up same way get correct b/w composite signal on TV and RGB monitor. One signal for display not present i think !! Attached Thumbnails

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10 January 2015, 13:13	#2
majsta www.majsta.com Join Date: Jun 2010 Location: Banjaluka/Republic of Srpska Age: 43 Posts: 448	I have one A600 and by just looking to you pictures it looks to me that it is the same problem. Like you said it is not possible to describe problem just by looking to the pictures but if I found the problem on my A600 I ll report how I fixed it so that could be nice starting point to resolve your problem.

11 January 2015, 13:24	#3
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,772	Does the machine work? What happens to the graphics if you run a game?

11 January 2015, 19:02	#5
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	More like something wrong with the data or address bus. If a colour component was missing, you wouldn't get white or grey.

13 January 2015, 19:41	#7
tomead tomead Join Date: Feb 2010 Location: Chichester Age: 45 Posts: 71	As it has been suggested that the issue may be a address decoding issue. I have swapped Gary for a known good part and no change. Anbody able to give any hints as to troubleshoot this.

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