PreenFM > preenfm2 and preenfm3

Preen doesn´t start - display is black

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Maria:
Dear all,

I need your help.
I just finished building my new PreenFM2 (R5d).
Unfortunately, the screen is black. I am using the USB cable connected to the PC. The PC recognizes the USB stick.
But the display is black. Nothing happens.
Attached you will find the pic of my board. Maybe I did a mistake in soldering :-(
Please help me with that.
I am so looking forward to using the instrument.

Thank you!
Mariangela

Xavier:
Hi,

Is it the metal case from Van Daal Electronics ?
So your Display is an OLED one ?
If yes, the "OLED" resistor should be populated with a 22ohm resistor.

Xavier

Maria:
Hi Xavier,
Thank you so much!
I wasn't sure if I had to put a resistor there.
So, I have done it now. However, nothing happens :-(
USB is recognized. I see its light on. But display is still black.

Xavier:
What do you see exactly about the USB. The USB key light ?
Can you see the content from the your PC ? That's weird, the preenfm should boot in midi device mode.

Plug the audio, and le me know if you hear a "pop" when you plug your preen.
You can also try to press and hold "INST" and then pree one of the 5 left buttons. You should hear a note.
If not then the problem is not the display.

You can read this thread :
http://ixox.fr/forum/index.php?topic=63509.0
And verify the different points shown of message #6.

That would help also if you can post a better quality pictures of your PCB.

served:
Hello,

Thank you Xavier for stepping in.
We sold that DIY kit.

My suggestion would also be that Connect the MIDI cables and try to play it. See if there is any audio coming.

Make better pictures of the oled screen pinheader.
1) OLED screen side pinheader.
2) Mainboard pinheader soldering side.

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