Earphone Trouble - LG C1100 Service Manual

4.13 Earphone Trouble

Test Points
Circuit Diagram
AIN2P
The direction of the audio
R148
100
AIN2N
AOUT3P
R138
JACK_DET 2.2K
(DBB)
The direction of the audio
signal to the ear-receiver
R156
C123
R158
Figure 4-25.(a)
signal from the ear-mic
VMEM
U105
VMEM
2
VCC
C123
39p
R137
TC153
10u
VMEM VMIC SWITCHING
When Jack is activated
VMIC
VMEM
R156 100K
GND
3
IN
1
R158
NA
MAX4599EXT-T
R153
1K
39K
CLOSE TO EARJACK
R141
4.7
C165
C167
C179
39p 39p
39p
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4. Trouble Shooting
J102
R181 C167 R154 R159
Figure 4-25.(b)
VMIC_ON
R159
HOOK_DET
1K C124
R154
0.1u
NA
2
4
R181 4.7 3
1
5
VA153
VA154
C168 HEADSET JACK
18p
SP114 SP115
R153
J102