OPPO renlme GT can't be turned on

OPPO renlme GT can’t be turned on

Machine model: OPPO renlme GT

Fault phenomenon: OPPO renlme GT was charging the night before. When I got up the next morning, I found that the mobile phone couldn’t turn on suddenly. Pressing the power on button didn’t respond.

OPPO renlme GT can’t be turned on Figure 1.

Maintenance process: according to the customer’s description, the mobile phone was charged and then could not be turned on the next day.

OPPO renlme GT can’t be turned on Figure 2.

After dismantling the machine, power on short-circuit current separately for the main board. After replacing a charging chip, it is still short-circuit current.

OPPO renlme GT can’t be turned on Figure 3.

According to experience, it should be caused by Short circuit.Open all shielding cover and measure the ground value of Capacitor. It is found that there is one VCC Short circuit.

OPPO renlme GT can’t be turned on Figure 4.

The main board was fumigated with Colophony (Solder), and the circuit VCC was burned with 1V. At the same time, through the thermal imaging observation of infrared Camera, it was found that there was a problem with one of Capacitor.

OPPO renlme GT can’t be turned on Figure 5.

OPPO renlme GT can’t be turned on Figure 6.

After deducting the problem Capacitor, the ground value is measured again to be 1.245v, indicating that the problem of Short circuit has been solved.short-circuit current time, use the regulated power supply to power on and find that the mobile phone can be turned on, but auto restart will be turned on.

OPPO renlme GT can’t be turned on Figure 7.

OPPO renlme GT can’t be turned on Figure 8.

It was found that the main board high temperature was very serious after the machine was disassembled. This restart should be caused by the temperature of Qualcomm snapdragon 888 CPU being too high. The CPU was redone and the fault was still the same. After replacing an RAM, the fault was repaired.