PreenFM > preenfm2 and preenfm3
[Fixed in v0.91] PreenFM3 v0.90 - output routing
mr-g:
ok i have found something, the white screen bug seems to appear not just on voice change but also in other places in the GUI...
i have noticed GUI glitches that occur when operating buttons and pots... the screen brightness pulses a little whilst pressing buttons / pots and quickly appearing GUI glitches appear over the screen...
I have made a video to demonstrate this for you... watch the screen as i repeatedly press button to see the glitches and you can also the white screen at the end.
https://we.tl/t-VMhPScpQgH
hope this helps!
Xavier:
Thanks for the zip file and the video.
It does not come from the DX7 files.
That really looks like a communication problem between the CPU and the display that can come from several things.
So I have several questions :
1. When the screen is white, can you try to hold down the "Menu" button for one or 2 seconds untill it goes black then release. It reinits the display. Does the screen come back after that ?
2. Can you try the firmware in the attached zip :
https://drive.google.com/file/d/1BDWWxVl31jN6005eECzhV845tw332e40/view?usp=sharing
It uses a slower clock to send data to the display.
Is it better, the same or worse ?
3. Can you double check all the display soldering point ?
4. Does it still glitch when you lightly press the bottom border of the display without touching the pins ?
5. Can you share the display exact reference ?
Thanks
mr-g:
Looks like this is the problem :-[
I've destroyed the tiny resistor next to the display header..
Xavier:
This is a 100nF decoupling capacitor.
It's between the ground and the 5v. You can remove it completely and it should work, but don't leave it like this as it could make a shorcut.
You can also solder a regular (Through hole) 100nF cap if you have that between the 2 pins.
I'm not sure that can be the reason.
Can you try at least point 1 & 2 from the list above ?
mr-g:
1. When the screen is white, can you try to hold down the "Menu" button for one or 2 seconds untill it goes black then release. It reinits the display. Does the screen come back after that ?
YES it returns to normal
2. Can you try the firmware in the attached zip :
https://drive.google.com/file/d/1BDWWxVl31jN6005eECzhV845tw332e40/view?usp=sharing
It uses a slower clock to send data to the display.
Is it better, the same or worse ?
How to flash this firmware, its not a *.dfu?
3. Can you double check all the display soldering point ?
Yes seems fine apart from that 100nF cap issue :-[
4. Does it still glitch when you lightly press the bottom border of the display without touching the pins ?
No change when pressed
5. Can you share the display exact reference ?
https://www.amazon.co.uk/gp/product/B07QS6BCGK/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
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