Audio - LG GD910 Service Manual

3.10 Audio

3.10.1 Audio amplifier
GD910 use an external audio amplifier for speaker.
TPA2005D1 is 1.1W speaker amplifiers with supporting differential input and direct drive .
AUDIO AMP
C251
22n
SPK_OUT_N
C257
22n
SPK_OUT_P
SPK_AMP_EN
3.10.2 Microphone circuit
MIC
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Only for training and service purposes
U202
TPA2005D1ZQYR
R217
82K
D1
IN-
R218
82K C1
IN+
A1
_SD
R219
100K
[Figure 3.10.1-1] Speaker AMP circuit diagram
C235 33n
MIC_P
C236
DNI C237 33n
MIC_N
R215
1K
VMIC_P
[Figure 3.13.2-1] Microphone circuit diagram
3. BB Circuit Technical brief
GD910 service manual
VBAT
C253
B4
1u
VDD1
C4
VDD2
B1
NC
L417 120nH
A4
VO-
L418 120nH
D4
VO+
C264
22p
C241
R213 R214
2700 2700
39p
C243
1u
- 43 -
CN204
1
2
C265
22p
MIC200
1
C238
2
33p
SOB-311S44-RC10W
C242
39p
LGE Internal Use Only