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21
preenfm2 and preenfm3 / Re: DIY help, frozen screen
« Last post by served on October 28, 2020, 11:55:34 AM »
Hello.

Preenf405 is assembled by me and tested and run and confimed to be working.
I hand soldered the Pinstrips. You can have a look at it, but I am sure they look good, as I am very strict on the soldering quality.
So I would think its something else. Look over the 20pin sockets where the preenf405 is sitting.
Look over the USB Drive connector, make sure there is no excess stress on it.

The USB stick with that patch is not cheap chineese crap that brakes. So I am sure that the stick is good.
The stick has been formated from 64GB to 1GB and FAT32 so that PreenFM can read it.
Dont change it.

Is your 5V coming from your eurorack bus or from the onboard regulator?

Remove the screen and make visual inspection on all solder points. Make sure there are no shorts.




22
preenfm2 and preenfm3 / Re: DIY help, frozen screen
« Last post by lokki on October 28, 2020, 08:21:28 AM »
i would definitely start by just reheating all the preenf405 socket connections. remove the preenf405 first then reheat all the connections on the sockets, make sure they make good clean solder blops. do you have a multimeter?

did you solder the preenf405 headers on your own? this would be my next guess for failure.
23
preenfm2 and preenfm3 / Re: DIY help, frozen screen
« Last post by zmberber on October 27, 2020, 11:06:57 PM »
i have p2_cv_2.12.bin, so that should be the correct version.

so apparently i need to check out the chip...  damnit... maybe i should check the soldering points of the socket for the chip?  or i should desolder and solder a new socket??  i hope i can work it out...
24
preenfm2 and preenfm3 / Re: preenfm3 sd card error
« Last post by Xavier on October 27, 2020, 09:47:03 PM »
I just published a 0.92 firmware.
At the last moment i decreased the SD communication speed, would be great if you could give a try and let me know.
https://github.com/Ixox/preenfm3/releases
25
preenfm2 and preenfm3 / Re: DIY help, frozen screen
« Last post by Xavier on October 27, 2020, 09:46:13 PM »
EDIT 2:  And this time, I did the following: It booted, I was able to do stuff, then I did nothing, then I waited, and then I just tapped the module (the whole thing, I just tapped the chassis), and then it gave me the blank screen.  So apparently there is some faulty connection of the (or a) chip.

That could explain.

Just in case : there's a display problem with 2.20beta firmware when screensaver is activated.
Mais sure that's not what you have.... Stick with 2.12_cv version for the eurorack for the moment.
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preenfm2 and preenfm3 / Re: preenfm3 firmware : 0.92
« Last post by Xavier on October 27, 2020, 09:43:48 PM »

New sequencer and many UI/control surface fixes.
I also dicrease the SD communication frequency as an attempt to fix the SD problem some user have.
27
preenfm2 and preenfm3 / Re: DIY help, frozen screen
« Last post by zmberber on October 27, 2020, 09:18:22 PM »
Hm, I pressed on the chip, and then I was able to play around in edit mode a bit longer than before, but then as soon as I pressed "menu", it froze and then I saw the blank screen again.

I tried again, I wiggled around the chip (i put it in and out of the socket), tried again, but this time, i hardly did anything, and then it froze.

i am not sure if pressing "menu" was the reason, i think it was just random.

EDIT: yes indeed, it is random, i again had the situation that i got a blank screen just suddenly (i scrolled through algos).  it really seems to be random, because this time it happened after i did nothing.

EDIT 2:  And this time, I did the following: It booted, I was able to do stuff, then I did nothing, then I waited, and then I just tapped the module (the whole thing, I just tapped the chassis), and then it gave me the blank screen.  So apparently there is some faulty connection of the (or a) chip.
28
preenfm2 and preenfm3 / Re: DIY help, frozen screen
« Last post by zmberber on October 27, 2020, 09:12:34 PM »
I just think posting stuff in the forum is good because others might have similar problems so they can see how I fix my problems (that's what forums are for, right? ;D).


= = = = = = =
Xavier EDITED : Sorry i made a bad action with this message and remove 80% of it  :-\
But i totally agree with what you wrote  :)
29
preenfm2 and preenfm3 / Re: DIY help, frozen screen
« Last post by Xavier on October 27, 2020, 08:53:34 PM »
It booted, I was able to do stuff in edit mode for a few seconds, and then it suddenly froze.  And then, as soon as I rebooted, it gave me the fully lit blank screen again.  And this happens over and over everytime I reboot.  think if I wait for a longer time and I power on the module again, I can get to the edit menu again for a few seconds, but then it will freeze again (Or maybe I am just imagining stuff).  Could it be that some capacitor is wrong or faulty?  Is my USB reader broken or something?

When you say "it suddenly froze", is it when you access browse or load presets ? or at any moment ?

Could it be that some capacitor is wrong or faulty?  Is my USB reader broken or something?

No i don't think so (for both question).
That's weird.
Could be a bad connection of the preenf405. Double check the DIP40 soldering and push a little more the preenf405 inside.

Ardi from Van Daal Electronics follows this forum, but you can try to contact him directly to see if he has an idea.



30
preenfm2 and preenfm3 / Re: DIY help, frozen screen
« Last post by zmberber on October 27, 2020, 08:23:10 PM »
Okay, I tried with multiple sticks.  one was a 128 GB, and one was a 4GB.

I got the following behaviour:  The 128GB didn't work at all, just like before (btw the stick I used before was actually 64 GB).  I tried the 4GB stick.  It booted, I was able to do stuff in edit mode for a few seconds, and then it suddenly froze.  And then, as soon as I rebooted, it gave me the fully lit blank screen again.  And this happens over and over everytime I reboot.  think if I wait for a longer time and I power on the module again, I can get to the edit menu again for a few seconds, but then it will freeze again (Or maybe I am just imagining stuff).  Could it be that some capacitor is wrong or faulty?  Is my USB reader broken or something?

Btw thanks again for your quick responses and thanks for your engaged help!
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