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Author Topic: A1200 Sudden video problem  (Read 2505 times)

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Offline mykrowyreTopic starter

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A1200 Sudden video problem
« on: September 26, 2023, 03:34:12 PM »
I finally have another A1200 in my hands after 20 years, and it's been amazing. 

However, I started having random keyboard freezes only on a few keys, as if something was hammering an interrupt. I would lose only certain keys such as L and a few others on the right side of the keyboard. They would come and go in bursts.

I removed my accelerator and still had the problem so I figured it must be time to re-cap this amiga.

Then, the keyboard problem went away completely, and instead I am left with jail bars on the screen. Amiga runs fine but the video now has faint jail bars similar to the C64.  I suspect this was a capacitor shorting and I'm hoping it didn't just damage my video chip but hoping this is just ripple now left unfiltered.

I have a cap kit on the way, but was just curious if anyone else had seen this scenario unfold and identified the culprit?

Thanks

« Last Edit: September 26, 2023, 03:38:29 PM by mykrowyre »
 

Offline mykrowyreTopic starter

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Re: A1200 Sudden video problem
« Reply #1 on: September 27, 2023, 03:15:24 AM »
Ok I figured out the video issue... it's only visible when I am in PAL screen mode (NTSC amiga).  When I switch back to NTSC Hires, it's gone.

The keyboard problem is back again, going thru everything now to see if it's something simple.
 

Offline mykrowyreTopic starter

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Re: A1200 Sudden video problem
« Reply #2 on: October 10, 2023, 02:16:23 AM »
I fixed the keyboard problem lol

https://www.youtube.com/watch?v=zjF7ibCXMHU