Messages

1

preenfm2 and preenfm3 / Re: [SOLVED] Fresh build: 7805 is getting hot, device not turning on

« on: December 14, 2014, 10:32:33 PM »

Just want to let you know everything is fine now

2

preenfm2 and preenfm3 / Re: Fresh build: 7805 is getting hot, device not turning on

« on: December 13, 2014, 02:24:32 PM »

Found it! It wasn't the pcb - there was a short at one of the display pins. I was too concentrated on the pcb though... Perfect. Let's check it out now! The encoder values are jumping a little, but this is a new problem to solve.

3

preenfm2 and preenfm3 / Re: Fresh build: 7805 is getting hot, device not turning on

« on: December 12, 2014, 07:50:08 PM »

Yeah, I'm quite sure about the soldering, but I'll double check it! I just realized Xavier made these checking points for me. Great! I will at first clean it, resolder it, measure shorts with a beeper and then finally check the voltage.

I bet this is something stupid.

Thanks guys, read you in some days.

4

preenfm2 and preenfm3 / Re: Fresh build: 7805 is getting hot, device not turning on

« on: December 12, 2014, 05:54:36 PM »

Ok. Looks like a job for this weekend 

5

preenfm2 and preenfm3 / Re: Fresh build: 7805 is getting hot, device not turning on

« on: December 12, 2014, 02:44:59 PM »

yes, i tried it with different usb sticks, all FAT formatted and different sizes/manufacturers.

When i put the USB Cable into a Computer, it says: "USB deactivated, the device is taking too much power blablabla..." and the preenfm is not turning on.
When i put in a regular 7,5V or 9V cable (with and without Jumper 2), the 7805 ist getting hot but still not turning on.

Not turning on means no signal of life at all: Display stays black. No LED is blinking, the USB stick led (if available, i tried different) is not blinking, nothing.

MEH

Any idea?

6

preenfm2 and preenfm3 / Re: Fresh build: 7805 is getting hot, device not turning on

« on: December 11, 2014, 08:29:36 PM »

and the last one.

[attachment deleted by admin]

7

preenfm2 and preenfm3 / Re: Fresh build: 7805 is getting hot, device not turning on

« on: December 11, 2014, 08:29:07 PM »

another one

[attachment deleted by admin]

8

preenfm2 and preenfm3 / Re: Fresh build: 7805 is getting hot, device not turning on

« on: December 11, 2014, 08:28:38 PM »

next

9

preenfm2 and preenfm3 / Re: Fresh build: 7805 is getting hot, device not turning on

« on: December 11, 2014, 08:28:10 PM »

and here the photos

10

preenfm2 and preenfm3 / Re: A new PreenFM2 is born!

« on: December 11, 2014, 11:12:41 AM »

two preenfms are better than one 

11

preenfm2 and preenfm3 / Re: Fresh build: 7805 is getting hot, device not turning on

« on: December 11, 2014, 11:11:39 AM »

yes, according to the picture:
D2: silver ring to south
D3: silver ring to west

12

preenfm2 and preenfm3 / Re: Fresh build: 7805 is getting hot, device not turning on

« on: December 11, 2014, 11:05:02 AM »

I tried both: with USB (computer + usb-wallwart) nothing happens.
With a 7,5 or 9v wall wart power supply the 7805 is getting hot quickly, but still stays off.

13

preenfm2 and preenfm3 / Re: Fresh build: 7805 is getting hot, device not turning on

« on: December 11, 2014, 10:52:27 AM »

yeah i had no converter on my phone, now its ~ 800kb.
the other picture i will take today evening when i'm back at home.

[attachment deleted by admin]

14

preenfm2 and preenfm3 / Re: Fresh build: 7805 is getting hot, device not turning on

« on: December 11, 2014, 10:29:29 AM »

there you go!

15

preenfm2 and preenfm3 / [SOLVED] Fresh build: 7805 is getting hot, device not turning on

« on: December 11, 2014, 01:32:43 AM »

I just finished soldering of the kit and cannot turn it on. Jumper 1 + 2 are set. The orientation of 7805 is as it should be. But the preemfm doesn't turn on and 7805 it's getting extremely hot.

To be honest, I'm lost.