LG U250 Service Manual page 65

3. TECHNICAL BRIEF
SPK_AMP_EN
C422
R427 1K
LINE_N
C423
R429 1K
LINE_P
R426
REV_C : 20K --> 3K
20K
0.1u R428 5.6K
0.1u
R430 5.6K
R431
20K
C431
NA
SPK_RCV-
SPK_RCV+
Audio part schematics
Audio AMP
NCP2890DMR2
1 8
_SD OUTB
2 7
U402
BYPASS VM
6
VP
3
INP
4 5
INM OUTA
L401 100nH
L402 100nH
REV_E : For Antenna Radiation
- 66 -
+VPWR
C428
1u
C425
10u
RCVN
RCVP
SPK-
SPK+