iPhone 7 battery replacement led to a black screen and no response to repair

iPhone 7 battery replacement led to a black screen and no response to repair

Machine model: iPhone 7
Malfunction: mobile phone screen is black or frozen doesn’t respond

iPhone 7 battery replacement led to a black screen and no response to repair Figure 1. 

Maintenance process: Disassemble the machine, connect DC power supply to see that the startup current is normal, but the screen screen is black or frozen doesn’t respond, and the screen failure remains the same. Microscopic observation showed that Screw hole next to BTB connector was punctured and Screw hole son fell off. 

iPhone 7 battery replacement led to a black screen and no response to repair Figure 2. 

Scraper slowly scrapes away the peeling place, and breaks all loose places Jump wire,Solder Mask UV curable. 

iPhone 7 battery replacement led to a black screen and no response to repair Figure 3. 

The screen is turned on and tested, the display returns to normal, the touch is normal, and the function is normal, so the maintenance is over. 

iPhone 7 battery replacement led to a black screen and no response to repair Figure 4. 

This fault is caused by Screw hole piercing, and the mobile phone screen is black or frozen doesn’t respond.