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Huawei glory X10 mobile phone does not display fault repair
Machine model: Huawei Honor x10
Fault phenomenon: the display IC and Inductor were replaced.
Huawei glory X10 mobile phone does not display fault repair Figure 1.
Fault analysis:
This model uses lm36274 display backlight two in one chip, the basic chip of this type of model will not be damaged, most of which are not displayed without backlight due to insufficient working conditions of the chip.
Maintenance process:
Refer to the same model of Huawei Nova 2plus IC base pin, check the X10 display IC bottom pin, two I2C found that the boot does not have 1.8V.
Huawei glory X10 mobile phone does not display fault repair Figure 2.
Huawei glory X10 mobile phone does not display fault repair Figure 3.
If the pull-up resistance of Related circuit is measured again, there is no VCC at both ends, but Diode value is normal at both ends.
Huawei glory X10 mobile phone does not display fault repair Figure 4.
Pull up 1.8V is from the power supply. The Capacitor on Related circuit does not have VCC.
Huawei glory X10 mobile phone does not display fault repair Figure 5.
Huawei glory X10 mobile phone does not display fault repair Figure 6.
After redoing the power supply,VCC returned to normal, but the boot failure still remained.
Huawei glory X10 mobile phone does not display fault repair Figure 7.
Display the IC bottom pin diode value, and find D3 pin diode value ol.
Huawei glory X10 mobile phone does not display fault repair figure 8.
On X10 schematic, this pin is BL EN from CPU, but on nova2p,pin is a 1.8V VCC.
Huawei glory X10 mobile phone does not display fault repair Figure 9.
Jump wire is defined directly according to pin and borrowed from a 1.8V VCC.
Huawei glory X10 mobile phone does not display fault repair Figure 10.
Maintenance results:
Boot test, perfect repair.
Huawei glory X10 mobile phone does not display fault repair Figure 11.
