1040 STF showing occasional rogue pixels

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exxos
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Re: 1040 STF showing occasional rogue pixels

Post by exxos »

sandord wrote: Fri Sep 28, 2018 3:22 pm RAMTEST says 171 OK passes, 0 fails.
:roll: Do you see the bad pixels on screen currently during the test ?

Have you tried a different monitor and shifter chip ?
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Re: 1040 STF showing occasional rogue pixels

Post by sandord »

exxos wrote: Fri Sep 28, 2018 3:39 pm
sandord wrote: Fri Sep 28, 2018 3:22 pm RAMTEST says 171 OK passes, 0 fails.
:roll: Do you see the bad pixels on screen currently during the test ?

Have you tried a different monitor and shifter chip ?
Currently, I'm at 623 OK passes. No bad pixels to be seen anywhere.
We've had this ST connected to three different monitors, same story everywhere.

I'm going to try with another shifter in a minute but I doubt that'll make any difference since the bad pixels stay bad as long as nothing writes to the the RAM at that spot. I don't think even the worst shifter could do that, render a specific pixel wrong over and over again.

Oh, I wanted to add that the bad pixels never flash (unless they're on a screen that is swapped by the program, like most games).
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Re: 1040 STF showing occasional rogue pixels

Post by sandord »

exxos wrote: Fri Sep 28, 2018 3:39 pm Have you tried a different monitor and shifter chip ?
I tried a different shifter: same story.
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Re: 1040 STF showing occasional rogue pixels

Post by exxos »

have you tried pushing down hard on each ram chip during YAART and see if anything happens.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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Re: 1040 STF showing occasional rogue pixels

Post by sandord »

exxos wrote: Fri Sep 28, 2018 4:07 pm have you tried pushing down hard on each ram chip during YAART and see if anything happens.
I just tried it on all chips of bank 0 (bank 1 is still disconnected). No errors.
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Re: 1040 STF showing occasional rogue pixels

Post by sandord »

I also tried a different MMU, no difference.
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Re: 1040 STF showing occasional rogue pixels

Post by sandord »

YAART doesn't show any bad pixels on 512 kb.
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Re: 1040 STF showing occasional rogue pixels

Post by exxos »

Very strange.

You could try diagrom if you can program roms.

https://www.exxosforum.co.uk/forum/viewt ... =50&t=1201
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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People should find solutions to problems, not find problems with solutions.
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Re: 1040 STF showing occasional rogue pixels

Post by sandord »

exxos wrote: Fri Sep 28, 2018 5:03 pm Very strange.

You could try diagrom if you can program roms.

https://www.exxosforum.co.uk/forum/viewt ... =50&t=1201
Sadly, no.
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Re: 1040 STF showing occasional rogue pixels

Post by exxos »

I found this program, never used it, but looks like it does some bit tests on screen...
MEMTEST.zip
(1.22 KiB) Downloaded 147 times
Blank_00027.png
Blank_00027.png (929 Bytes) Viewed 3859 times
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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