Guangzhou Sanjing Intelligent Electronic Technology Co., Ltd.
Tel：+86-20-89850310 / 89852480
Fax：+ 86-20-89850310 / 89852480
1. Checking the solder joint directly. That’s to say, if the component is a cold solder joint, the solder edge and the welding surface won’t be matched in a good way;
2. Adding some external force to the welded component by hand, then pull ing and shaking a few times; If the component is no loosening, you can confirm that there is no cold solder joint;
3. The Functional Test is helpful for us to judge if the cold solder joint is or not.