[experience] some suggestions and experience on repairing electronic equipment

summary

   I am interested in Electronics , Recently, even though I am very busy, I still find time to repair the broken before Small fan and Desk lamp , The following is my experience and lessons from these days of practice .

• For electronic devices , If determine Abnormal operation , Understand the structure of the equipment when disassembling , That is, which modules , What is the function of each module , And then according to My knowledge and network knowledge To determine which module is wrong .** Do not blindly power on or do other operations when you are not clear about all parts of the module .

• For circuit boards , If there is no obvious damage , Generally no problem , Even if some of its voltage values are different from what you understand （ It may also be that you don't have enough knowledge ！）, In particular, it has been running normally before .

• For batteries , First of all, judge whether the output voltage is normal , Never charge it directly ！！！

• For the circuit board with obvious damage marks , If the components burn black , First of all, we should understand the circuit principle ！ And then based on Silk screen printing is available To judge what the burned components are , What's the parameter （ It would be better if you could see it at a glance , I'm afraid the components have been carbonized ）.

• Always believe that there will be no problem with the board , The probability of problems is components , Don't immediately think of changing the board ！！！