Author Topic: [SOLVED]Bad power supply with high voltage.  (Read 4405 times)

kroutshev

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[SOLVED]Bad power supply with high voltage.
« on: November 13, 2014, 12:21:34 AM »
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.
« Last Edit: December 10, 2014, 11:31:34 AM by kroutshev »

Xavier

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Re: Bad power supply with high voltage.
« Reply #1 on: November 13, 2014, 09:36:24 AM »
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

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Re: Bad power supply with high voltage.
« Reply #2 on: November 13, 2014, 09:44:11 AM »
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

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Re: Bad power supply with high voltage.
« Reply #3 on: November 13, 2014, 09:54:03 PM »
Here's my blank screen :


kroutshev

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Re: Bad power supply with high voltage.
« Reply #4 on: November 13, 2014, 10:20:54 PM »
and unfortunaly no sound  :-[

Xavier

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Re: Bad power supply with high voltage.
« Reply #5 on: November 13, 2014, 10:22:05 PM »

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

kroutshev

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Re: Bad power supply with high voltage.
« Reply #6 on: November 13, 2014, 10:30:45 PM »
No it's the number 2 !

Xavier

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Re: Bad power supply with high voltage.
« Reply #7 on: November 13, 2014, 10:32:43 PM »

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

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Re: Bad power supply with high voltage.
« Reply #8 on: November 13, 2014, 10:44:14 PM »
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 !
« Last Edit: November 13, 2014, 10:47:04 PM by kroutshev »

Xavier

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Re: Bad power supply with high voltage.
« Reply #9 on: November 13, 2014, 10:48:28 PM »

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



kroutshev

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Re: Bad power supply with high voltage.
« Reply #10 on: November 13, 2014, 10:53:18 PM »
ok let's go i'm coming back soon :-)

kroutshev

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Re: Bad power supply with high voltage.
« Reply #11 on: November 13, 2014, 11:18:40 PM »
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

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Re: Bad power supply with high voltage.
« Reply #12 on: November 13, 2014, 11:21:09 PM »
What version do you use ?
dfu-util -V
You need 0.6 or 0.7 if i remember correctly....


kroutshev

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Re: Bad power supply with high voltage.
« Reply #13 on: November 13, 2014, 11:25:02 PM »
v 0.1 ...
but i can't reach dfu.org !!
« Last Edit: November 13, 2014, 11:27:06 PM by kroutshev »

Xavier

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Re: Bad power supply with high voltage.
« Reply #14 on: November 13, 2014, 11:29:02 PM »

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.