This is a typical fault, which is the poor contact between the movement wire and the motherboard socket. It can be handled as follows: 1 Make necessary shaping treatment for the cable to make it naturally parallel to the socket (loose cable). 2 Cut the flat cable 1-2mm. 3 Apply contact oil to the contacts. Cushion paper or tape paper is an emergency treatment and is not recommended.

The battery should have a screw behind the LCD screen. When it is opened, it is the battery.