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Old 09 January 2015, 16:33   #1
tomead
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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.
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Old 10 January 2015, 14:13   #2
majsta
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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.
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Old 11 January 2015, 14:24   #3
Hewitson
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Does the machine work? What happens to the graphics if you run a game?
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Old 11 January 2015, 18:44   #4
tomead
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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.
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Old 11 January 2015, 20:02   #5
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More like something wrong with the data or address bus. If a colour component was missing, you wouldn't get white or grey.
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Old 11 January 2015, 21:13   #6
tomead
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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 !!
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Old 13 January 2015, 20:41   #7
tomead
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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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