Geeetech

At last i can get my 3D printer under the work, and first i upload test firmware but this board don't work. It takes testfirmware in ok, but it only say beeb sometimes(and TX & DBG led flashes) and don´t communicate correctly. Picture will explain more about that.

So what we to about it?

regards J-P Seppala

if you use marlin firmware ,maybe is you baudrate set error. the marlin firmware's baudrate is 250000 or 115200 ,but you computer screen capture was 9600.so please check you baudrate.

More pictures about it.. Good quality, some dry joints and cross soldered components. Are there a short circuit or is that R1 and C12 contact ok? And that SD-reader....

Ok, i trye that baudrate-thing(115200baud works), and no i can read serial monitor on testfirmware, but LEDs on the boards still doesn´t blink correctly.

Then i load marlin firmware back, and board doesn´t communicate correctly on serial monitor.

hi ,The R1 and C12 is no problem,They together is correct.
When you use marlin firmware, serial monitor can receive something, but is garbled, can prove that communication, but communication format does not match. you make sure the baud rate of marlin firmware.The line 20 it in Configuraton. H.
You use the test firmware is that you write your own?if yes,Can you send it to me ?

Hello!

Testfirmware is downloaded reprap/wiki site.

ok! I will try it!