Asus ZB551KL Training & Trouble Shouting Manual page 65

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• Check if R1393.pin1(VREG_L19_2P85V) is 2.85V or not.
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• Check if R1399.pin2 is 2.85V or not.
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• Check if R1398.pin2 is 1.8V or not.
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• Check if SENSORS_I2C_SCL(R702.pin1) is 400Khz and SENSORS_I2C_SDA(R0701.pin1) is a
high-low transition signal.
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• Check if R1398.pin1(PROXIMITY_INT_N) is low or not when the object is close the sensor.
Proximity Test