Indivision AGA MK2 A4000D Display Issue

18 April 2016, 05:23

Hello!

I bought an Indi AGA MK2 from someone on another board a while back and just finally got around to installing it today (the wife and kids are off visiting her parents, so I finally get some time to play!). Noticed some odd behavior and wonder if anyone knows what might be going on... When I turn on the system, the screen is nice and clear for the first 5-10 seconds. Then it gets wavy and almost looks like there is some sort of interference going on for the next 30-60 seconds, then it gets nice and clear again and seems to stay that way.

Is this normal or anyone know what could be going on? It's installed in a towered A4000D, and I attached the ground wire to a different screw than the one identified in the manual since my tower doesn't use the top left corner screw, although I can't imagine that would make any difference?

Thanks!

icbrkr · 25 April 2016, 01:20

Oddly enough, one of my external scandoublers does the exact same thing but it only does it on certain monitors - other ones are perfectly clear constantly.

Kin Hell · 05 May 2016, 10:03

The Yellow cable is just to make sure the PCB gets a good ground contact, as does the motherboard on the Chassis stand-off's.

I've seen an old CRT VGA monitor do this @ certain Screen Resolutions, but you're lucky the wavy-ness goes away. My 17" VGA form-factor was always wavy on my A4000 with modified A2320. As soon as I put an NEC3-FG 15" Multisync on the Amiga, I never experienced wavy-ness again on the same Amiga Hardware.

Try another monitor, maybe two, but be sure they are a different make/model to be extra sure.

zipper · 05 May 2016, 10:32

My old scandoublers from Eyetech tend to do similar effects as the circuits warm up. Most old scandoublers do have an adjustable pot to do fine tuning.

Kin Hell · 06 May 2016, 10:51

Quote:

Originally Posted by zipper

My old scandoublers from Eyetech tend to do similar effects as the circuits warm up. Most old scandoublers do have an adjustable pot to do fine tuning.

Quite true, but the Indivision does not iirc.

06 May 2016, 19:15

I just bought an AGA 1200 Mk2cr from Amigakit and found that at higher resolutions I was getting a number of weird artefacts and randiom lines on the screen.
On investigation I found that the board itself gets very hot to the touch. After attaching some thermal gap filler and a small chipset heatsink to the AGA card the image is now rock steady and artefact free.

dirkies · 06 May 2016, 21:00

Why is there also a 2nd heatsink?

trixster · 06 May 2016, 21:55

That's over the Lisa chip (I think). He might have issues putting the keyboard back down. I had to file down the heat sink I put on there in order to get it to fit.

dirkies · 06 May 2016, 21:58

Don't see the point in doing that

06 May 2016, 23:26

It's over the Lisa chip as it gets quite hot too, the sink is a very low profile one so the keyboard went on O without any filing needing done.

Kin Hell · 07 May 2016, 10:07

@ Vypr

That's a great observation fella. Nice one!

Just shows how fickle these old style sockets are when fitting over Lisa's dull 20+ year old legs....

The Heat-sink just finishes it off with style.

18 April 2016, 05:23	#1
mikem Posts: n/a	Indivision AGA MK2 A4000D Display Issue Hello! I bought an Indi AGA MK2 from someone on another board a while back and just finally got around to installing it today (the wife and kids are off visiting her parents, so I finally get some time to play!). Noticed some odd behavior and wonder if anyone knows what might be going on... When I turn on the system, the screen is nice and clear for the first 5-10 seconds. Then it gets wavy and almost looks like there is some sort of interference going on for the next 30-60 seconds, then it gets nice and clear again and seems to stay that way. Is this normal or anyone know what could be going on? It's installed in a towered A4000D, and I attached the ground wire to a different screw than the one identified in the manual since my tower doesn't use the top left corner screw, although I can't imagine that would make any difference? Thanks! Attached Thumbnails

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25 April 2016, 01:20	#2
icbrkr Particles! BBS Join Date: Jan 2009 Location: Particles! BBS Posts: 47	Oddly enough, one of my external scandoublers does the exact same thing but it only does it on certain monitors - other ones are perfectly clear constantly.

05 May 2016, 10:03	#3
Kin Hell 0ld0r Git Join Date: Mar 2009 Location: Cornwall, UK Posts: 1,623	The Yellow cable is just to make sure the PCB gets a good ground contact, as does the motherboard on the Chassis stand-off's. I've seen an old CRT VGA monitor do this @ certain Screen Resolutions, but you're lucky the wavy-ness goes away. My 17" VGA form-factor was always wavy on my A4000 with modified A2320. As soon as I put an NEC3-FG 15" Multisync on the Amiga, I never experienced wavy-ness again on the same Amiga Hardware. Try another monitor, maybe two, but be sure they are a different make/model to be extra sure.

05 May 2016, 10:32	#4
zipper Registered User Join Date: Mar 2004 Location: finland Posts: 1,841	My old scandoublers from Eyetech tend to do similar effects as the circuits warm up. Most old scandoublers do have an adjustable pot to do fine tuning.

06 May 2016, 19:15	#6
Vypr Posts: n/a	I just bought an AGA 1200 Mk2cr from Amigakit and found that at higher resolutions I was getting a number of weird artefacts and randiom lines on the screen. On investigation I found that the board itself gets very hot to the touch. After attaching some thermal gap filler and a small chipset heatsink to the AGA card the image is now rock steady and artefact free.

06 May 2016, 21:00	#7
dirkies Zone Friend Join Date: Aug 2002 Location: Belgium Age: 51 Posts: 1,297	Why is there also a 2nd heatsink?

06 May 2016, 21:55	#8
trixster Guru Meditating Join Date: Jun 2014 Location: England Posts: 2,353	That's over the Lisa chip (I think). He might have issues putting the keyboard back down. I had to file down the heat sink I put on there in order to get it to fit.

06 May 2016, 21:58	#9
dirkies Zone Friend Join Date: Aug 2002 Location: Belgium Age: 51 Posts: 1,297	Don't see the point in doing that

06 May 2016, 23:26	#10
Vypr Posts: n/a	It's over the Lisa chip as it gets quite hot too, the sink is a very low profile one so the keyboard went on O without any filing needing done.

07 May 2016, 10:07	#11
Kin Hell 0ld0r Git Join Date: Mar 2009 Location: Cornwall, UK Posts: 1,623	@ Vypr That's a great observation fella. Nice one! Just shows how fickle these old style sockets are when fitting over Lisa's dull 20+ year old legs.... The Heat-sink just finishes it off with style.

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