A3000D problem

iSteve · 15 July 2007, 20:36

Hello there, first post here

I have a little problem with my A3000D.
It's a standard 3kD, though it says 2.0 roms on bootup (the floppy screen)

The problem i'm having, is that my screen looks untuned. I can recognize Workbench and the Insert Disk screen, but there are "shifting" lines on it. I'm using the built-in scandoubler.

I already tried to turn the pot between the VGA port and the scandoubler switch, no go.

If i hook it up through scart on a regular Scart monitor, i get a rolling picture.

Any idea's?

-Steve

alexh · 15 July 2007, 20:54

Use the non scandoubled output and a TV and see if it's just the AMBER output.

Try using the early startup and switching to NTSC mode

iSteve · 15 July 2007, 21:02

The only thing i can do in early startup is related to the disks. I can't find an NTSC or PAL option.

keropi · 15 July 2007, 21:12

hit space in the startup screen? that changes pal/ntsc on the A1200/4000

Jope · 15 July 2007, 21:43

The 2.0 early startup menu isn't as full featured as the one in 3.x

coze · 15 July 2007, 22:10

you can switch PAL/NTSC from the motherboard (there's a jumper) however, I'm not sure that's the problem.

keropi · 16 July 2007, 09:22

try switching to ntsc as Alexh says and report here... there is surelly a reason for him telling it...

alexh · 16 July 2007, 10:08

*If* the monitor he is trying cannot sync to 50Hz vertical refresh (and a LOT of 31KHz VGA monitors cannot) he may get the effects described. It would have to be an older, non digital, monitor to get a rolling picture rather than just black with "out of sync".

More monitors like 60Hz. Trying NTSC is a very good idea.

Add the NTSC monitor in DEVS: and switch modes in workbench.

iSteve · 16 July 2007, 10:14

Once i'll get back home from work, i'll try and find the jumper. Any tips on the location?

Also, i've tried several monitors. All had the same effect. If i change the pot while i connected the Amiga through scart on a Philips monitor, it has no difference either.

The battery is still fine, no leaking there.

-Steve

iSteve · 16 July 2007, 10:16

Quote:

Originally Posted by alexh

Use the non scandoubled output and a TV and see if it's just the AMBER output.

What exactly do you mean with AMBER output?
I get a rolling picture when connected to a TV/Philips monitor.

iSteve · 18 July 2007, 14:42

Where exactly can i find the NTSC/PAL jumper?

I took a look yesterday, but i can't find it.

coze · 18 July 2007, 14:59

it's J200, just near the agnus.

alexh · 18 July 2007, 15:28

Quote:

Originally Posted by iSteve

What exactly do you mean with AMBER output?

The AMBER is the name of the chip in the A3000 which performs the scandoubling / deinterlacing. It's output is via the 15-pin D connector (VGA) on the back of the A3000.

Quote:

I get a rolling picture when connected to a TV/Philips monitor.

To use a technical term, sounds like the A3000 is fucked

Some part of the motherboard / custom chips must be broken to cause a rolling picture when connected via RGB SCART. For it to affect both the normal output and AMBER output it must be before the AMBER circuitry on the motherboard.

Which version motherboard is it? Did it work in the past?

Are you sure the battery has not leaked? The Denise chip is NEXT to the battery!

If you have a OCS/ECS Amiga, try swapping out the Denise chip with the one from the A3000. If it works you can prove the fault is with the motherboard.

You may have to send it to JJB in France.

iSteve · 19 July 2007, 09:40

So if i can get my hands on another Denise chip, and replace it with the one in my 3k, it might work?

Does it matter if it comes from an A2000 or any other ECS/OCS Amiga?

I'll try and find Agnus and change the jumper.

alexh · 19 July 2007, 09:54

Quote:

Originally Posted by iSteve

So if i can get my hands on another Denise chip, and replace it with the one in my 3k, it might work?

If it generates the same problems then you know it's the chip rather than the motherboard. My bet is the motherboard though.

Quote:

Does it matter if it comes from an A2000 or any other ECS/OCS Amiga?

It shouldnt matter. If you can use two ECS denise chips then all the better.

Quote:

I'll try and find Agnus and change the jumper.

I think we are past that now. With the picture being corrupted on both SCART and AMBER outputs it hints at something more sinister.

It might be worth checking the positions of all the jumpers in the A3000 paying particular attention to the VDE (Amber) jumpers

http://www.l8r.net/technical/t-3000-jumpers.shtml

amiganer · 20 July 2007, 10:31

edit: wrong topic

sorry

iSteve · 20 July 2007, 23:28

Found the jumper, didn't help.

After i tried it, i decided to remove the battery as a precaution, only to discover a green substance below. One of the chips next to the battery has some battery acid on it too (only the first pin).

Maybe this is why i get a corrupted screen?

alexh · 21 July 2007, 00:20

Almost certainly. Try and clean it up, take the chip out (if socketted) and clean it up. Look closely for damage. Post some pics if you like.

iSteve · 21 July 2007, 17:35

What would be the best to clean battery acid?

I used an old, dry toothbrush, but are there any products i should use?

15 July 2007, 20:36	#1
iSteve Registered User Join Date: Jul 2007 Location: België Posts: 15	A3000D problem Hello there, first post here I have a little problem with my A3000D. It's a standard 3kD, though it says 2.0 roms on bootup (the floppy screen) The problem i'm having, is that my screen looks untuned. I can recognize Workbench and the Insert Disk screen, but there are "shifting" lines on it. I'm using the built-in scandoubler. I already tried to turn the pot between the VGA port and the scandoubler switch, no go. If i hook it up through scart on a regular Scart monitor, i get a rolling picture. Any idea's? -Steve

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15 July 2007, 20:54	#2
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,343	Use the non scandoubled output and a TV and see if it's just the AMBER output. Try using the early startup and switching to NTSC mode

15 July 2007, 21:02	#3
iSteve Registered User Join Date: Jul 2007 Location: België Posts: 15	The only thing i can do in early startup is related to the disks. I can't find an NTSC or PAL option.

15 July 2007, 21:12	#4
keropi . Join Date: Oct 2004 Location: Ioannina/Greece Posts: 5,040	hit space in the startup screen? that changes pal/ntsc on the A1200/4000

15 July 2007, 21:43	#5
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,862	The 2.0 early startup menu isn't as full featured as the one in 3.x

15 July 2007, 22:10	#6
coze hastala vista winny vista Join Date: Feb 2006 Location: mt fuji Age: 46 Posts: 1,335	you can switch PAL/NTSC from the motherboard (there's a jumper) however, I'm not sure that's the problem.

16 July 2007, 09:22	#7
keropi . Join Date: Oct 2004 Location: Ioannina/Greece Posts: 5,040	try switching to ntsc as Alexh says and report here... there is surelly a reason for him telling it...

16 July 2007, 10:08	#8
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,343	If the monitor he is trying cannot sync to 50Hz vertical refresh (and a LOT of 31KHz VGA monitors cannot) he may get the effects described. It would have to be an older, non digital, monitor to get a rolling picture rather than just black with "out of sync". More monitors like 60Hz. Trying NTSC is a very good idea. Add the NTSC monitor in DEVS: and switch modes in workbench.

16 July 2007, 10:14	#9
iSteve Registered User Join Date: Jul 2007 Location: België Posts: 15	Once i'll get back home from work, i'll try and find the jumper. Any tips on the location? Also, i've tried several monitors. All had the same effect. If i change the pot while i connected the Amiga through scart on a Philips monitor, it has no difference either. The battery is still fine, no leaking there. -Steve

18 July 2007, 14:42	#11
iSteve Registered User Join Date: Jul 2007 Location: België Posts: 15	Where exactly can i find the NTSC/PAL jumper? I took a look yesterday, but i can't find it.

18 July 2007, 14:59	#12
coze hastala vista winny vista Join Date: Feb 2006 Location: mt fuji Age: 46 Posts: 1,335	it's J200, just near the agnus.

19 July 2007, 09:40	#14
iSteve Registered User Join Date: Jul 2007 Location: België Posts: 15	So if i can get my hands on another Denise chip, and replace it with the one in my 3k, it might work? Does it matter if it comes from an A2000 or any other ECS/OCS Amiga? I'll try and find Agnus and change the jumper.

20 July 2007, 10:31	#16
amiganer Registered User Join Date: Jun 2007 Location: germany Posts: 56	edit: wrong topic sorry

20 July 2007, 23:28	#17
iSteve Registered User Join Date: Jul 2007 Location: België Posts: 15	Found the jumper, didn't help. After i tried it, i decided to remove the battery as a precaution, only to discover a green substance below. One of the chips next to the battery has some battery acid on it too (only the first pin). Maybe this is why i get a corrupted screen?

21 July 2007, 00:20	#18
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,343	Almost certainly. Try and clean it up, take the chip out (if socketted) and clean it up. Look closely for damage. Post some pics if you like.

21 July 2007, 17:35	#19
iSteve Registered User Join Date: Jul 2007 Location: België Posts: 15	What would be the best to clean battery acid? I used an old, dry toothbrush, but are there any products i should use?

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