Hey, guys. Sadly, I need your help again. Thought I´m in a need of a hot air gun station for SMD, so I ordered one cheap one from different country. Today I unpacked it and to my surprise, Its not working. I dont want to go to truble of sending it back, so I open it up and start measuring.
Here Is what happened after I tested it : temperature regulation works just fine, but fan spins on minimum RPM untill I crank it all the way up. The fan span quickly, but on the second test it did not work at all. I opened it up, tried to connect the fan on a power supply and its shot. I measured the voltage on the fan connectors and its ove 40V at the maximum settings with load on it (the fan is 24V 0.15A, so I connected 150R resistor to it.) Doesnt sound so good, does it ? I took a look at the main board and the potentiometer for the fan and both buttons were not soldered to the board ! (or only with tin vapors it seemed) I fixed that one up, but no change.
I guess its familiar PCB layout Chinese people were copying for centuries, so I will post some photos down here and ask you guys nicely, any idea what could be the problem ? I will order new fan in the meantime.
![](https://i.imgur.com/F5hBHbP.jpg)
![](https://i.imgur.com/6CxgxKK.jpg)