Graphical issues

[looren]

Hi

I've had my 1200 recapped a few years ago, and after getting it back I was stoked to launch some good old games on it.
Although upon trying several games I noticed graphical problems. First I thought it was the floppy the games were loaded from, but as I had double copies of some of them I could confirm that the exact same issues were found on the copies also. James pond and Pang are two titles I remember having issues.
I can't boot up my 1200 at the moment, as I'm still looking for someone that can repair my old Commodore monitor (high pitch sound), but I did find a thread in another forum where a guy describes and shows the exact same issue as I have on my 1200:
https://www.radios-tv.co.uk/community/vintage-computers/amiga-a500-graphics-problem/

Just looking for some input in preparation.
Is anyone here familiar with the problem or know how this might be solved? Is it the memory that might be the issue as is being discussed in the forum?

[looren]

I noticed this like two years ago, and kind of gave up for the moment given that both the screen was/is giving up and there was this strange problem with the 1200. Thought I'd revisit the problem, if anyone has a clue on what it might be, and/or a solution to it.

[looren]

Guessing its RGB for the 1084s monitor? right?

I'm assuming it was done properly. The guy who recapped makes both hardware and software stuff for Amiga and seem pretty active with everything. What type is used, I don't know. He said it has nothing to do with the recapping tho.

I never turned on the 1200 before having it recapped, as its been in storage for a long time. I didn't want to risk it in case any caps were leaking, so I really can't say if the problem existed before it being recapped.

I used my original 500 power supply, and it has also been recapped.

I take it from your answer, this issue isn't common.
All I know is that its always the same graphics that gets screwed up. For example: https://www.radios-tv.co.uk/wp-content/uploads/wpforo/attachments/249/6587-3.jpg
It will always be the background that is screwed, and the sprites will be as expected.

Or like here: https://www.radios-tv.co.uk/wp-content/uploads/wpforo/attachments/249/6588-4.jpg
Background will be screwed and text will always be fine.

[looren]

Hi Pat the Cat

I've diagnosed with DiagROM. I've gone through all the options that are viable for the 1200, and it gives OK on them all.
I guess that includes all three points you've mentioned?

[looren]

Seems this hole just keeps getting deeper and deeper.
I'm using DiagROM 1.2.1

Regarding booting into ECS or OCS, I see no direct option for these, but I guess you are referring to "original" under the "display" option in the boot menu? When booting using original, the game Pang for example just goes to a completely red screen when the level starts where as enhanced or best boots in normally to the game but with the game glitches as described before.

I guess I'd just expect different (more random) bad results if there is a physical connection that is broken, but I really have no idea, its far from my expertise.