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Forum Index : Microcontroller and PC projects : Picture tearing

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romba6

Newbie

Joined: 04/07/2020
Location: United Kingdom
Posts: 37
Posted: 03:43pm 27 Jul 2020
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Another 'newbie' to the group! Finished my build last week but unfortunately I had tearing in various graphic modes. After reading the forum opted to try the crystal/cap. mod. Not so easy at my age!! I left the old crystal in as it looked a pain to remove (is that OK?) but it works with the test pattern in all modes, so extremely happy. A great product and a joy to read the posts on the forum.
 
JoOngle
Regular Member

Joined: 25/07/2020
Location: Sweden
Posts: 82
Posted: 04:52pm 27 Jul 2020
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Welcome to the forum :)

And grats on your build. Yes the CMM2 is a fascinating device indeed.
Did your kit come with and old crystal and 2 capacitors? Or did you get
one with the Crystal Oscillator (a little can, with a very stable oscillator built inside it)? They recommend the canned version as it's much more stable.

Did you also try to adjust the shift/timing of your VGA monitor, this COULD help.
 
romba6

Newbie

Joined: 04/07/2020
Location: United Kingdom
Posts: 37
Posted: 05:23pm 27 Jul 2020
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Thank you !!!
I bought separately the crystal  and the 0.1uf cap, both are SMD and fit on the empty pads of the CMM2 (rev3) pcb. It was particularly bad on Mode 1,12 & 16, Mode 2,12 & Mode 4,12. It failed on 3 monitors, 'AUTO' on the monitors didn't change the 'tearing'. This mod fixed the problems for sure.
 
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