Show Posts
1
preenfm2 and preenfm3 / Help with new build - OLED not working
« on: September 07, 2020, 12:01:29 AM »
Hi,
I'm having trouble getting my PreenFM2 up and running. It's a kit from Van Daal Electronics that I built over the weekend.
I followed all of the instructions, including the Yellow OLED high frequency solution (http://ixox.fr/forum/index.php?topic=69159.0), clipping the pin and adding the jumper. I added the 22 Ohm resistor at the spot in the upper right of the board indicated. Unfortunately, I didn't realize I had the R5d version of the board.
When I started it for the first time, the OLED display flickered, was dim in places and there was high frequency noise. But, I could navigate the menus, generate random patches, and play notes via MIDI. The encoders, volume, and LEDs were all functional.
I thought no problem, I'll remove the accidental fix and I should be set. I desoldered the jumper and replaced the clipped pin. But then the loading screen would appear briefly (<1 sec) and then go blank. By pressing the MENU button, I could get something to appear. The display did not flicker, but the text was completely garbled.
I've checked all of the points in the troubleshooting thread (http://ixox.fr/forum/index.php?topic=63509.0) and the values are all the same, with the exception of the marked display pin, which is 4.6V. (Pin 4 is 3.3V).
I thought it might be an issue with either the header on the board or the OLED. I delsoldered and replaced the header on the board. I desoldered/resoldered the header on the OLED. There didn't appear to be a short between adjacent pins.
I tried to reflash via bootloader, but the behavior is the same, which makes it difficult to navigate. The bootloader screen appears for <1 sec and disappears to a blank screen.
Any thoughts what might be happening or what else I could try to solve the problem? For the few minutes I had it up and running, it was nice. I'm looking forward to spending more time playing with it.
Thanks in advance for your help.
I'm having trouble getting my PreenFM2 up and running. It's a kit from Van Daal Electronics that I built over the weekend.
I followed all of the instructions, including the Yellow OLED high frequency solution (http://ixox.fr/forum/index.php?topic=69159.0), clipping the pin and adding the jumper. I added the 22 Ohm resistor at the spot in the upper right of the board indicated. Unfortunately, I didn't realize I had the R5d version of the board.
When I started it for the first time, the OLED display flickered, was dim in places and there was high frequency noise. But, I could navigate the menus, generate random patches, and play notes via MIDI. The encoders, volume, and LEDs were all functional.
I thought no problem, I'll remove the accidental fix and I should be set. I desoldered the jumper and replaced the clipped pin. But then the loading screen would appear briefly (<1 sec) and then go blank. By pressing the MENU button, I could get something to appear. The display did not flicker, but the text was completely garbled.
I've checked all of the points in the troubleshooting thread (http://ixox.fr/forum/index.php?topic=63509.0) and the values are all the same, with the exception of the marked display pin, which is 4.6V. (Pin 4 is 3.3V).
I thought it might be an issue with either the header on the board or the OLED. I delsoldered and replaced the header on the board. I desoldered/resoldered the header on the OLED. There didn't appear to be a short between adjacent pins.
I tried to reflash via bootloader, but the behavior is the same, which makes it difficult to navigate. The bootloader screen appears for <1 sec and disappears to a blank screen.
Any thoughts what might be happening or what else I could try to solve the problem? For the few minutes I had it up and running, it was nice. I'm looking forward to spending more time playing with it.
Thanks in advance for your help.