electronic got fried

[ash2k14]

Hi, I bought and built the 3d printer from http://www.aliexpress.com/item/2015-New ... 47628.html

All wiring were done carefully as well but when I turned it on a smoke came out, found out the board fried the microcontrollers. My board is Sanguinololu 1.3a with a4988 stepsticks, the printer now can't run due to faulty boards I believe

[zhangxueyou]

Did you wire correctly? Maybe you reverse the "+" and "-" wires.

[ash2k14]

Did you wire correctly? Maybe you reverse the "+" and "-" wires.

You mean it was from PSU right? it was correct, the -ve are black wires, +ve are red wires. In fact, the smoke came out about 1-3 minutes after I first turn the machine on. Furthermore my second try I noticed there were nothing on the display except the light that slowly goes dim then off, I smell some faint burnt smell then I quickly turn off again, third and fourth attempt were the same

[zhangxueyou]

Please take a picture of your wiring on mainboard.

[ash2k14]

Here you go
https://plus.google.com/photos/10824700 ... 6994548033

[zhangxueyou]

The wiring is correct. Sorry, we can't find out what's wrong, so that we can only conclude that you made some mistake during assemble. Please contact our customer service.

[ash2k14]

I tried to connect the board itself only without anything attached by using usb, pronterface cannot connect and would stuck during the connecting... message. I tried to burn the marlin firmware but it failed on me by showing some kind of avrdude error through arduino ide. I believe i didnt do any mistake during the electronic wiring. Even if you stated that the polarity reversed, the electronic would have been fried in an instant the moment i turned the psu on

I already submit this issue to your technical support last friday, and another through live chat earlier.

[ash2k14]

Hi, I don't think I made any mistakes on wiring up the electronics. I followed the guide carefully as well. When I tried to burn marlin firmware, it gave me this error
avrdude: stk500_getsync(): not in sync: resp=0x00

However, I noticed at the back of the board, there were 2 pins bridged together for the z axis pins in this picture here

[zhangxueyou]

It is ok that the 2 pins bridged together. Look at the picture.

QQ截图20150317090515.png (417.04 KiB) Viewed 13505 times

We have tested the board before sending, we've try our best to find what's wrong with your board from the picture. So please contact the customer service.
And I am sorry for your trouble.

[zhangxueyou]

It is ok that the 2 pins bridged together. Look at the picture.

QQ截图20150317090515.png (417.04 KiB) Viewed 13501 times

We have tested the board before sending, we've tried our best to find what's wrong with your board from the picture. So please contact the customer service to address the issue.
And I am sorry for your trouble.