Author Topic: Preenfm2 Dead  (Read 116 times)

alexchm

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Preenfm2 Dead
« on: May 13, 2019, 10:50:25 AM »
Hi, i just recently purchased the metal case and the yellow oled to upgrade my preenfm, and used it happilly in the last 3 days.
Last night i shut it down to find out this morning that it wont power on... The LCD will only turn on when i try to power the module from usb and thats all, doesnt boot doesnt do anything... i opened it up and dont see any smoked components or stuff like that, right now im far from my bench, ill have to wait till tomorrow to get back home to analyse this better.

Has anyone had the same problem? I used it only with 9V PSU

Xavier

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Re: Preenfm2 Dead
« Reply #1 on: May 13, 2019, 10:55:11 AM »

Hi,

Check JMP1 is on, and verify the voltage at the 7805 pins.

Quote
"The LCD will only turn on when i try to power the module from usb"

So what do you see on the LCD in this case ?

Have you try entering bootloader mode by pressing a key while powering it on.

Xavier

alexchm

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Re: Preenfm2 Dead
« Reply #2 on: May 13, 2019, 11:03:30 AM »
on screen are just squares... indeed regulator shows 0 to little volts!

EDIT: the diode under the regulator is shorted, gonna take one leg out, and see whats there

EDIT2: swapped the regulator and the preenfm turns on, but still only squares on the screen
« Last Edit: May 13, 2019, 11:27:30 AM by alexchm »

Xavier

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Re: Preenfm2 Dead
« Reply #3 on: May 13, 2019, 12:41:32 PM »
on screen are just squares... indeed regulator shows 0 to little volts!

EDIT: the diode under the regulator is shorted, gonna take one leg out, and see whats there

EDIT2: swapped the regulator and the preenfm turns on, but still only squares on the screen

Only square on the screen means there's a problem with the USB stick.
Get your stick, put it in a computer, backup your banks from it if you can.
Then format it again and fill the pfm2/ directory with the file from this zip :
https://github.com/Ixox/preenfm2/releases/download/2.08/pfm2_usb.zip

alexchm

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Re: Preenfm2 Dead
« Reply #4 on: May 13, 2019, 01:14:07 PM »
its all gone.. everything i created, all those patches...dispersed like space dust. im heartbroke. dont know what could have gone wrong, but a failing regulator shouldnt destroy usb stick that easy... ill need a link for that usb stick so i can swap the nand, if i lost all my work, im dead
« Last Edit: May 13, 2019, 01:26:48 PM by alexchm »

Xavier

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Re: Preenfm2 Dead
« Reply #5 on: May 14, 2019, 01:36:35 PM »
but a failing regulator shouldnt destroy usb stick that easy...

It depends on what broker the regulator. A too high voltage could leak to the 5v pin and goes directly to the USB stick  :(

ill need a link for that usb stick so i can swap the nand, if i lost all my work, im dead

I don't understand what you need here.

alexchm

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Re: Preenfm2 Dead
« Reply #6 on: May 14, 2019, 09:25:40 PM »
a link to the place where i can buy this EXACTLY usb stick that comes with the PCB so i can use mine as donor.. high voltage problems not sure where could i get those as i live in germany since last year and the house was build 4 years ago with the best electrics stuff i could find here. i just hope its pure coincidence/unluck that the regulator failed after installing the new oled and case, anyway im going to install a fuse on this thing. if i ever recover my patches.
« Last Edit: May 14, 2019, 09:32:48 PM by alexchm »

Xavier

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Re: Preenfm2 Dead
« Reply #7 on: May 15, 2019, 11:04:01 AM »

I don't understand why you need the EXACT same USB stick.
Anyway, most of them are ARETOP 1Gb or 2Gb Usb key.

Xavier

alexchm

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Re: Preenfm2 Dead
« Reply #8 on: May 16, 2019, 08:39:48 AM »

for this:
https://www.youtube.com/watch?v=_catJb73LI8

already lost my data from sequencer, laptop died on me half a year ago too.
so yea, im pretty desperate right now.

Xavier

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Re: Preenfm2 Dead
« Reply #9 on: May 16, 2019, 09:37:14 AM »

for this:
https://www.youtube.com/watch?v=_catJb73LI8

already lost my data from sequencer, laptop died on me half a year ago too.
so yea, im pretty desperate right now.

 :o
I can send a USB key for free if you haven't ordered it yet... Let me know.  ;)