VFD scrolls to the right in all modes

[htpc]

Hi

I have a problem with an OEM iMon VFD (Thermaltake MediaLab):
A few days ago, my display started to show random chars, so I updated iMon to 1.78.1125.
Since then, the random chars are repaired, but another problem showed up:
On every display update, the text on the display jumps to the right.
So you see the right half of the text on the left side of the display, then you see everything just fine, then you see the left side of the text on the right side of the display and then you see nothing at all.
Then it starts all over again.
This happens every second if the time is displayed - in other modes it's faster or slower, depending on the update frequency.
When I change system volume, for example, it's so fast I can't read anything.

I updated to 1.80.1224 beta, but nothing changed.

Do you know any help?

Thanks for reading,
htpc

[kc5vdj]

based on my research so far, you seem to either have a bad connector (check first) or hosed drivers.

so far as i can tell, all 32 characters have to be sent in each OUT interrupt transaction to the device. scrolling seems to be done entirely in software.

example: " blah"... " blah"... " blah"... " blah"... " blah"... "blah"...

(i left out all of the padding spaces) would scroll the world "blah" from the middle to the left of the first line. the second line of the display begins with the 17th character sent to the device.