LG U890 Service Manual page 61

3. TECHNICAL BRIEF
Handset main MIC BLK
Audio Amp for loud Speaker
R513 0
VREG_5V
C538
1u
SP0102BE3
5
G3
4
U503
PWR
3
G2
2
G1
1
OUT
AMP_PWR AMP_PWR
C536 22n
M_SPK-
C537 22n
M_SPK+
SPK_AMP_EN
MIC
C523 C525
10u
47p
C528 22n
C529 22n
Audio AMP
C535 82p
R512 100K
U504 LM4898ITLX-NOPB
B1 C3
VDD VO2
R516
20K
C1 A3
IN- VO1
R517
20K A1 A2
IN+ BYPASS
C2 B2
SD_SEL SD_MODE
B3
GND
R520 100K
C540 82p
R521 100K
- 62 -
MICBIAS
MIC1N
MIC1P
SPK_P
⇒
SPK_N
C539
0.1u
Speaker