PreenFM > preenfm2 and preenfm3

Help request for troubleshouting Preen fm

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Xavier:
2.5v points are set by the DAC when received relative 0 from the CERB40 board.
Which means, if you don't have 2.5v, your CERB40 is not working or not flashed.
Did you flash your CERB40 correctly ?
http://ixox.fr/preenfm2/build-it/burn-firmware/


Xavier

Henk vd Broek:
i checked the bootloader   and reinstalled it  using Zadig
but my dislplay stays black ,not even a blink of a led 
 my multimeter says that there is no shortcut to the ground from the 2,5v v points

Xavier:

--- Quote from: Xavier on January 20, 2015, 09:52:05 AM ---First check : the jumpers.
Jmp1 & Jmp2 must be ON.
Jmp3 must be OFF.

--- End quote ---

Please double check and confirm this.
JMP3 must be open... Seems like i see some soldering near the 2 pins.

Xavier

Henk vd Broek:
good evening  Xavier ,
still nothing and no jumper problems
i did some reading this afternoon on ghielectrics.com ,and if i read it right
the only thing the m.c normally needs to start is the 3.3 v  v.r 
isn,t it ??

funkyfli:
If you are getting 3.3 volts at pin 1 and not 2.5 volts at the correct points then the odds are your cerb40 either does not have the preenfm firmware installed or it is in the DFU / Firmware update mode.  This matches with your blank screen.  Jumper 3 does look like it is 'bridged' which would cause the DFU mode - I'd triple check that one :) .  Also, pins 6 and 7 on the cerb40 look like they might? be bridged which may or may not have any effect...

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