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Messages - dzenat

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preenfm2 and preenfm3 / reinstalling firmware
« on: February 18, 2020, 11:40:44 AM »
hi again,

i think I might have messed up some the usb drive. I tried to upgrade firmware to 2.11 by copying the 2.11 zip file to the usb drive and unzipping it. It then creates a build folder. I put all the files into the drive and plug in the usb & start the preenfm up. now i get a blank screen. What's going on? Should I reinstall the firmware again? What are the steps I should do to reinstall the firmware?

preenfm2 and preenfm3 / Re: PreenFm stop working, blank & werid screen
« on: February 18, 2020, 10:44:15 AM »
finally got time to fix this. it's working now, well at least after 2 power up, I get a normal screen. Before reporting on sound and all I realized that when i removed the sides of case, the preenfm powers up properly. There might be something wrong with the usb drive as well. I've got a blue one. At things wriggling it helps. Otherwise, I check soldering jonts and psuh the graphic board deeper, so maybe that help too.

Seems like there's an update on the firmware. I might try to get a new usb to test and update the firmware.

Will try testing sound soon.

preenfm2 and preenfm3 / Re: PreenFm stop working, blank & werid screen
« on: February 05, 2020, 07:27:56 AM »
ok thanks for the reply.

I'll look into that later tonight.

preenfm2 and preenfm3 / PreenFm stop working, blank & werid screen
« on: February 03, 2020, 03:19:44 PM »
hi there,

after some time I managed to have some time with the preenfm again. I bought it as a diy kit, I built it successfully and it was working before but now I can't even start the thing up. Sometimes i get a blank screen and sometimes i get strange acsii lettering. I might have made a mistake once or twice with plugging in the wrong polarity.
So to explain how i get this;

First I plug in in power I get the acsii lettering then the screen doesn't change and stays the same. Then I unplug it and replug power in and then I get black screen, no more letterings. Then I remove power and leave it unplug for some time. After I try again and lettering appear again.
Otherwise the blue lights blink and the light on the usb is on.

I'm uploading some pics to show what happens.

Any ideas how I can fix this?

preenfm2 and preenfm3 / Re: Strange behaviour starting up
« on: July 20, 2019, 03:49:57 AM »
Seems like after many tries, i finally manage to start up fine. But when playing with it, the screen display strange letterings....I don't understand what actually went wrong there...  to the developer, any ideas?

preenfm2 and preenfm3 / Strange behaviour starting up
« on: July 19, 2019, 01:05:10 PM »
Hi there,

I managed to update the firmware to 2.10. nice.
Then I made a mistakte by unpluging the usb cable out and now i can't even start up the preenfm.

The blue lights blink but nothing happens on screen's all black.

Is there a reset some where to reset the system? or should I reload the firmware? I made a copy of firmware 2.08 before upgrading...

Any help?

preenfm2 and preenfm3 / (SOLVED) Strange Behaviour of Display
« on: May 07, 2018, 04:34:20 PM »
--- Missing OLED Resistor!

Hi there,

Finally the preenFm arrived today and I managed to finish building it up in a couple of hours. And when i power up the preenFM with usb connected to my computer... I get a strange behaviour with the display. It's bright at the start but when I click buttons or turn the encoders, the brightness of the display changes from bright to dim in a step like manner. After a few times, it goes back to bright.

I thought it was because i left out the 68ohm resistor besides the 10k resistor, took it apart and solder it on with a 22ohm resistor as I think I have the OLED version, NHD-0420DZW-AY5. But it doesn't change any thing. The display still dims.

Any ideas?

..Still haven't tested audio or midi in....

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