[SOLVED] Fresh build: 7805 is getting hot, device not turning on

[tmk009]

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.

[Xavier]

Check all your ICs direction (especially the op amp).

Could you post picture of the back side of your pfm2 ?

[tmk009]

there you go!

[Xavier]

Better resolution please 

640x480 is not enough. I don't even see if JMP3 is set or not... (It should not).

And a picture of the other side without the OLED screen.

[tmk009]

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]

[Xavier]

What power supply do you use ?

Have you tried powering it with USB only ?

I'll add tonight some 5V/GND/3.3V points to check.

[tmk009]

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.

[Xavier]

I don't see diode D2 & D3 on the pictures near the 7805.
Directions are OK ?

[tmk009]

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

[tmk009]

and here the photos

[tmk009]

next

[tmk009]

another one

[attachment deleted by admin]

[tmk009]

and the last one.

[attachment deleted by admin]

[Xavier]

I don't see any obvious problem with your pictures.
You can clean up a little the PCB  Most of the time, the yellow things on the PCB can be removed easily.

You could start checking the following values

[Xavier]

When you say the preenfm2 does not turn on ?
What do you mean ? is the screen black or all yellow ?
You tried with a USB stick with the "/pfm2/" directory on it, right ?