Geeetech

cRaZyT wrote:I don't have any resistor to try but I bridged both solder points with with a screw driver and the effect was that the green power LED behind the USB connector was shining after connecting the USB cable with my laptop.

Did you try uploading a sketch that way?

It should have been a backup, I found it on the board schematic, but without any info about the backup. This fuse protects the board against the USB power input without having this fuse or a bridge between both solder joints, the USB connection does not work. Could you try to solder a resistor and ...

Maybe there was a fuse at some point which was not needed later so they removed it, i don't know.

Apparently my board has a broken ftdi chip. I did not change the oscillator and thought I should try something else. So I tried uploading the Marlin firmware to the board through the SPI interface (MOSI,MISO,SCK) using my Arduino Mega as a programmer (uploading the ArduinoISP example and then settin...

Cup wrote:@left_gangster
Did you try solder another crystal(16MHz) on the board?
I think you can have a try though i guess it's more likely the FTDI chip has a problem...

Ok I will try this then since I have no other choice. I will report my results here.

You can try replacing the crystal with another one if your LCD is two rows of rectangles. And if your LCD is working fine now,then it maybe the FTDI chip was broken,you can attach the picture of the FTDI on your board(as clear as possible,i mean the numbers on it). In addition,there is another way ...

Hi,@left_gangster Did you notice the following post? http://www.geeetech.com/forum/viewtopic.php?f=20&t=17102 I think you can change another crystal oscillator to take a look. Yes I have seen this thread, but as I said, the board was working before, it was showing up as COM5 but it would not connec...

I tried all your suggestions, using Arduino 1.0.1 and 1.0.5 burning bootloader through 1.0.1, 1.0.5 and the current latest 1.6.8 my GT2560 was working before but it would not connect to any of the programs (Arduino and Repetier) and showed up on the Device Manager as COM5. Now that I burned the boot...