Huawei MediaPad 10 fhd Maintenance Manual page 56

MediaPad10 FHD Maintenance Manual
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Circuit analysis
The LCD involves simple peripheral circuits. All drive circuits are integrated on a circuit
board of the LCD.
The power supply of the LCD circuit is simple and needs only to provide analog voltages
and supply power to the LED.
The data signals of the LCD circuit are the MIPI interface signal and five pairs of
differential signals (one pair of clock signals and four pairs of data signals).
The control signals of the LCD circuit are the IIC interface signal, backlight enabling
signal, and PWM control signal.
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Fault analysis and location
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Circuit signals
2012-10-09
Both the backlight LED and the LCD are off. Check whether the power circuit is
normal, whether jacks are in good contact (Ensure that cables are properly plugged
and unplugged), and whether the system has been properly started.
The LCD is off but the backlight LED is on. Check whether the power circuit is
normal and whether jacks are in good contact (Ensure that cables are properly
plugged and unplugged).
The LCD is flashing or garbled. Check whether the PWM is working properly and
whether the materials of the LCD are normal.
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