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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: knight76 on September 30, 2012, 12:20:39 PM

Title: A1200 to 1084S monitor.
Post by: knight76 on September 30, 2012, 12:20:39 PM

Another issue has reared it's head.

I have an Amiga 1200 with a built in CF hard drive. I also just acquired a 1084s monitor that came with an Amiga 500.

Is the RGB video cable that comes with the A500 compatible with the A1200 also? My 1084s has the round DIN connector on it's end with I believe 6 pins. I read somewhere about an A1200 one having 9 pins.

The issue is when connecting the A500 to the 1084s colors are fine, image is fine, when connecting the 1200 there is no red in the image and the image appears a bit more dimmed.

Is this a cable issue, or due to the 1200 output frequency?

Title: Re: A1200 to 1084S monitor.
Post by: knight76 on October 01, 2012, 04:29:12 AM

Due to testing the A500 drive and ram expansion issue I worked out the cause of this issue. It is a loose RGB connection inside the monitor.

The A500 started to not show red as well, but reds showing on composite fine. I happened to wiggle the RGB connector whilst the A500 was on and the reds appeared.

Looks like I will have to open up the 1084s to see what is going on there.

Title: Re: A1200 to 1084S monitor.
Post by: knight76 on October 01, 2012, 06:04:39 AM

Opened it up and pin 4 on that RGB connector is lifted from the PCB. The round disc that sits on the PCB is lifted also. Pin 4 corresponds with red video on the pinout for the 1084s.

Title: Re: A1200 to 1084S monitor.
Post by: knight76 on October 01, 2012, 07:22:01 AM

I ran a trace wire from pin 4 to one of the destination pins and red is back again. All fixed.

(http://i6.photobucket.com/albums/y242/knight76/Misc%20Stuff/1084sc.jpg)

Title: Re: A1200 to 1084S monitor.
Post by: jay on October 01, 2012, 08:43:27 AM

Can the 1084s display vga resolutions aswell?

Title: Re: A1200 to 1084S monitor.
Post by: rewlako on October 01, 2012, 08:47:13 AM

Quote from: jay;709965

Can the 1084s display vga resolutions aswell?

Resolution: yes
Refresh rate: no

Title: Re: A1200 to 1084S monitor.
Post by: knight76 on October 01, 2012, 08:52:23 AM

I dont believe so.

Title: Re: A1200 to 1084S monitor.
Post by: Matt_H on October 01, 2012, 11:36:42 PM

Nice repair work. Glad you're up and running!

Title: Re: A1200 to 1084S monitor.
Post by: knight76 on October 02, 2012, 12:53:54 AM

Quote from: Matt_H;710025

Nice repair work. Glad you're up and running!

Ta, I'm real happy to get it going again, that is my first repair of a monitor fault lol.