1085s dodgy lines?

chaoticjelly · 14 August 2006, 19:34

Picked up a 1085S video monitor (Commodore brand) it was advertised as fully working, but isnt..!

The pictures rock steady and clear, but there are lines going up and down the screen, a couple of lines, which when you turn the monitor on for the first time move up and down the screen really fast, and then they slow down a bit later on, after a few minutes they settle at the top, then the bottom of the screen, then start pulsing again..

Its like an interference effect, but there is nothing near the monitor to interfere with it, and its constant... any ideas?

Overdoc · 15 August 2006, 15:00

Maybe the potentiometer which is used for adjusting the picture up/down & the one for narrowing/widening is a little bit bad ?

chaoticjelly · 15 August 2006, 22:37

Hmm.. im not sure, but looking at the cable from the Amiga to the monitor, the insulation is cut at the monitor end, there are 3 pins missing from the 9 pin end.

Perhaps there is a problem with the cable, and the previous owner realised this, and not being able to get into the moulded cable, they cut the insulation..

I will make a new cable and try the monitor then.. im not sure if its the pots.. I doubt it though as the pictures nice and the horizontal and vertical work fine.. its like interference or when you put a mobile phone next to a tv making interference..

chaoticjelly · 21 August 2006, 21:12

I found out the problem I think.

I tried another Amiga with the monitor, and it worked great.

It seems the problem lies with the Amiga 1200. Its a first revision ever 1A, which apparently has a bug which causes the screen to flicker when the CPU is running?

I found a site where I can fix it by attaching a 3.3 uF capacitor to two pads on the motherboard..

Ace!

14 August 2006, 19:34	#1
chaoticjelly Registered User Join Date: Jun 2005 Location: UK - Lancs Age: 38 Posts: 80	1085s dodgy lines? Picked up a 1085S video monitor (Commodore brand) it was advertised as fully working, but isnt..! The pictures rock steady and clear, but there are lines going up and down the screen, a couple of lines, which when you turn the monitor on for the first time move up and down the screen really fast, and then they slow down a bit later on, after a few minutes they settle at the top, then the bottom of the screen, then start pulsing again.. Its like an interference effect, but there is nothing near the monitor to interfere with it, and its constant... any ideas?

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15 August 2006, 15:00	#2
Overdoc Commodore Collector Join Date: Aug 2001 Location: Austria Age: 53 Posts: 944	Maybe the potentiometer which is used for adjusting the picture up/down & the one for narrowing/widening is a little bit bad ?

15 August 2006, 22:37	#3
chaoticjelly Registered User Join Date: Jun 2005 Location: UK - Lancs Age: 38 Posts: 80	Hmm.. im not sure, but looking at the cable from the Amiga to the monitor, the insulation is cut at the monitor end, there are 3 pins missing from the 9 pin end. Perhaps there is a problem with the cable, and the previous owner realised this, and not being able to get into the moulded cable, they cut the insulation.. I will make a new cable and try the monitor then.. im not sure if its the pots.. I doubt it though as the pictures nice and the horizontal and vertical work fine.. its like interference or when you put a mobile phone next to a tv making interference..

21 August 2006, 21:12	#4
chaoticjelly Registered User Join Date: Jun 2005 Location: UK - Lancs Age: 38 Posts: 80	I found out the problem I think. I tried another Amiga with the monitor, and it worked great. It seems the problem lies with the Amiga 1200. Its a first revision ever 1A, which apparently has a bug which causes the screen to flicker when the CPU is running? I found a site where I can fix it by attaching a 3.3 uF capacitor to two pads on the motherboard.. Ace!

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