[SOLVED]Bad power supply with high voltage.

[kroutshev]

Hi,
 i have made a mistake last night : i have connected a power supply too high in voltage for the preenfm2 first run board.
Now i have a screen with few whites and black squares. Regulator 7805 was very hot. I have tested it and same voltage in input and output.
I have replaced it with a new one. Now i have 10 v in input and 5,2V at output.
But still strange screen with indications.
Where i can find reference voltage to check which components are out of service please ?
Thanks for your help.

[Xavier]

Hi

I have tested it and same voltage in input and output.

What voltage did you get at the output ? 10V ?
(To understand what did the composant received).

I have replaced it with a new one. Now i have 10 v in input and 5,2V at output.
But still strange screen with indications.
Where i can find reference voltage to check which components are out of service please ?
Thanks for your help.

Any picture would help ?
Does your preenfm2 still make sound ?
Does the display change when you turn encoder or press buttons ?

[kroutshev]

Hi Xavier,
When i had the wrong power supply it was 18V.

About sound i havn't tested it and the display doesn't change when i turn encoder.
I will post a picture this evening.

[kroutshev]

Here's my blank screen :

[kroutshev]

and unfortunaly no sound 

[Xavier]

I started a reply... then i had a doubt.
It's a preenfm1 no ? not a 2...

[kroutshev]

No it's the number 2 !

[Xavier]

Sorry, the preenfm1 had no 7805 regulator 

So have you checked the second regulator ?
http://www.mouser.fr/Search/ProductDetail.aspx?R=LD1117V33Cvirtualkey51120000virtualkey511-LD1117V33C
5v->3.3V
The STM32F4 (MCU) is powered by this 3.3V.

[kroutshev]

Ok let's go
7805 : Input 10.6 V Output 4.93
LD1117  Input 4,87 Output 3,28

The 7805 is hot and not the second regulator.
It seems correct !

[Xavier]

OK, next step is to try to reflash the bootlader and the firmware.
http://ixox.fr/preenfm2/build-it/burn-firmware/

[kroutshev]

ok let's go i'm coming back soon :-)

[kroutshev]

Problem  with dfu
C:\Documents and Settings\Papa Ours.MINIMOI\Mes documents\Téléchargements\preenf
m>dfu-util -a0 -d 0x0483:0xdf11 -D p2_boot_1.11.bin -R -s 0x8000000
dfu-util - (C) 2007-2008 by OpenMoko Inc.
This program is Free Software and has ABSOLUTELY NO WARRANTY

dfu-util: invalid option -- s
Usage: dfu-util [options] ...
  -h --help                     Print this help message
  -V --version                  Print the version number
  -l --list                     List the currently attached DFU capable USB devi
ces
  -d --device vendor:product    Specify Vendor/Product ID of DFU device
  -p --path bus-port. ... .port Specify path to DFU device
  -c --cfg config_nr            Specify the Configuration of DFU device
  -i --intf intf_nr             Specify the DFU Interface number
  -a --alt alt                  Specify the Altsetting of the DFU Interface
                                by name or by number
  -t --transfer-size            Specify the number of bytes per USB Transfer
  -U --upload file              Read firmware from device into <file>
  -D --download file            Write firmware from <file> into device
  -R --reset                    Issue USB Reset signalling once we're finished

[Xavier]

What version do you use ?
dfu-util -V
You need 0.6 or 0.7 if i remember correctly....

[kroutshev]

v 0.1 ...
but i can't reach dfu.org !!

[Xavier]

Hmm... their site is down.
I attached the v0.7 binaries to this message.
... And i go to bed. I'll read your result tomorrow.