Figure 4-14 Working Principles Of The Lcd Circuit; Table 4-7 Definitions Of Signals Of The Headset Circuit - Huawei MediaPad 10 fhd Maintenance Manual

MediaPad10 FHD Maintenance Manual
l
Table 4-7 lists the signals of the headset circuit.

Table 4-7 Definitions of signals of the headset circuit

Signal Name
HSL/R_PA_OUT
HSL/R
VIMD_OUT
EAR_L/R
EAR_DET
Working Principles of the LCD Circuit
l
Figure 4-14 shows the working principles of the LCD circuit.

Figure 4-14 Working principles of the LCD circuit

2012-10-09
− The headset does not output signals. Check whether the small headset board is faulty,
the FPC jack is properly connected, the BTB jack on the PCBA is normal, and the
headset power amplifier U1501 is working properly.
− The headset MIC cannot record voice. Check the small headset board, the FPC jack,
and the PMU in turn.
Circuit signals
Function
Headset signal output by the headset
power amplifier
Headset signal output by the PMU
19.2°C temperature detection
Signal output by the headset power
amplifier to the headset jack
Headset detection
Working principles
Huawei Confidential
INTERNAL
Test Reference Value or
Oscillogram
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