preenfm Forum
PreenFM => preenfm2 and preenfm3 => Topic started by: Poopenheimer on June 17, 2016, 12:09:28 AM
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Well, I have built the latest metal case kit (R5 board) and closed jumper 1 & 2. When I plug in the USB power source, or a 9v source I get no response from the unit. When I hold a button and add power via USB connection the device powers up and the LEDs blink and I get access to the drive on my computer. Pressing button 1 I can turn off and on the access to the storage device.
The issue I have is when I apply USB power sometimes I get mixed unknown characters on the display or nothing at all. When the characters are displayed they do not resemble anything I can read. I am not sure if it is a solder issue or firmware issue but I have been attempting to reburn the PreenFM2 firmware but it came loaded on the USB stick with the kit.
Is it a firmware issue or did I miss a solder point?
I did the best I could to scour other posts in case anyone had the same issue but mine seems a bit different from the other fixes recommended.
Thanks in advance!
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I'm having the same issues. Just finished my kit.
When I plug in just the USB to my laptop, I get all gibberish plus a high pitch noise.
https://www.youtube.com/watch?v=4qNZc9aF6Qs
I was able to get it working with the jumper 2 removed and a 9v & USB at the same time.
However, I still get intermittent random characters and horizontal scrolling.
Weird thing is that in Firmware mode (where you can mount the USB) the screen renders fine. I think OP was seeing the same thing.
Running Firmware 2.203o
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Yes, that is very similar except fewer legible characters. Now that I am home I will try out that combo but not sure where to go if it works.
Thanks for the read!
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nice username ???
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Hi,
In firmware mode the timing in the LCD communication are more conservative. Which explain it works better.
What you see is the LCD receiving some corupted commands.
That maybe due to bad LCD header connection or dirty header pins.
Try to check and redo the LCD header soldering and clean the pins.
Best,
Xavier
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Thank you for the response.
I'm going to resolder both sides of the OLED pins. Hope that fixes the issue. Will report back.
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Have a look at this picture.
(http://vandaal-electronics.com/wp-content/uploads/2016/06/preenFM.png)
Make sure you have a good connection for thouse 6 pins. I would suggest you to solder 6 Wire jumper between the Main board and the OLED screen pins for thouse points. This will eliminate the Pinheader. It should be related to the pinheader.
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I am now reading through other posts in general, and saw the noise reduction update. The kit I received also contains the metal plate, resistor and patch wire to make the alteration to the OLED connection. I'll do the fix when I get home today and also do the work around you recommended. Thank you for the response, hopefully it clears up!
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I figured out the issue. I was missing the jumper that was required after adding the resistor for the screen noise issue. Now things are working great. Thanks again for the help.
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So I'm still getting screen issues when midi notes are being sent.
When the menu button is pressed and rebooted the screen works fine.
https://youtu.be/nyK6ygRsNug
I'm running 2.7 overclocked (could this be the issue?)
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Hi, sorry for the delay.
I don't think the issue can be because of the overclocking.
Did you buy your kit (prebuild unit ?) from Van Daal Electronics ? I think they know this problem, try to contact them.
If not, what display do you have ?
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How did you wire the Case?
Do you have a shielding on the metal case or its floating?