HUAWEI Mate 30 Pro Screen does not Display Repair

Machine model: HUAWEI Mate 30 Pro

Fault phenomenon: HUAWEI Mate 30 Pro screen does not display.

Repair process: disassemble the mobile phone, take off the main board, power on the single board, the screen still does not display when the current of the power meter reaches more than 1a, install the motherboard to another screen assembly for testing, and the screen still does not display, so it can be determined that the problem is the motherboard.

HUAWEI Mate 30 Pro Screen does not Display Repair Figure 1.

The display chip has been moved before maintenance, and the ground value of VCC pin on the display base was measured, and the VCC AMOLED of the display screen was found_Avdd pair value is 0, the value is not normal, take off the display chip to measure VCC value is also pulled down, indicating that it is AMOLED_There is a problem with the connection of avdd to Capacitor.

HUAWEI Mate 30 Pro Screen does not Display Repair Figure 2.

Check Boardview and find three Capacitor on one line.So they were slowly removed one by one in sequence. After removing the second one,Measuring diode value was found not to be Short circuit.

HUAWEI Mate 30 Pro Screen does not Display Repair Figure 3.

HUAWEI Mate 30 Pro Screen does not Display Repair Figure 4.

So we put the chip on the motherboard again, put the motherboard back into the mobile phone, plug in the charger and turn on the phone. The screen of the mobile phone can be displayed, and the maintenance is over.