OPPO A72 is not turned on (backlight boosting capacitor is damaged)

OPPO A72 is not turned on (backlight boosting capacitor is damaged)

An OPPO A72 with automatic black screen in use is not turned on. After testing, it is found that there is a display without backlight. We directly replace the backlight three-piece chip.diode; the one who lacks dialectical thinkingStep-up inductor, there is no problem in measuring the resistance of the seat. Try to replace the backlight step-up capacitor, and it lights up successfully after replacement.

[Fault model] OPPO A72

[Fault phenomenon] No boot.

[Maintenance process] I received a machine sent by a customer for repair, the model of which is OPPO A72, and the screen automatically goes black when it is in trouble.

OPPO A72 does not turn on. Figure 1

After testing, it is found that there is a display without backlight. First, find the backlight chip near the CPU, and there is no problem in measuring the chip resistance and diode. If the measured backlight power supply is consistent with the main power supply voltage, it will not be boosted. Because there is no backlight,blueprintWe directly replace the backlight three-piece chip, diode and boost inductor.

OPPO A72 is not turned on. Figure 2

The failure of the boot test is still the same, and there is no problem in measuring the resistance of the seat. Try to replace the backlight booster capacitor, and it lights up successfully after replacement.

OPPO A72 does not turn on. Figure 3

[Maintenance Result] Install the motherboard into the shell.mobile phoneIt can be turned on normally, and the functions of WiFi, Bluetooth, voice, charging, fingerprint, taking photos and making phone calls are all normal, so the maintenance is over.