LG KU250 Service Manual - Page 65
Audio AMP
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3. TECHNICAL BRIEF LINE_N LINE_P SPK_AMP_EN R427 1K R429 1K C422 C423 REV_C : 20K --> 3K 0.1u R428 5.6K 0.1u R430 5.6K Audio AMP R426 20K R431 20K NCP2890DMR2 1 _SD 8 OUTB 2 BYPASSU402 VM 7 VP 6 3 INP 4 INM OUTA 5 C431 NA C425 10u C428 1u SPK- +VPWR SPK+ C4265600p C4275600p 1000p C429 1000p C430 SPK_RCVSPK_RCV+ L401 100nH L402 100nH REV_E : For Antenna Radiation Audio part schematics RCVN RCVP - 66 -
3. TECHNICAL BRIEF
- 66 -
Audio part schematics
REV_C : 20K --> 3K
Audio AMP
REV_E : For Antenna Radiation
5.6K
R430
C423
C428
1u
0.1u
R427
1K
R429
1K
C431
NA
C422
0.1u
2
4
INM
INP
3
OUTA
5
8
OUTB
VM
7
VP
6
1
_SD
NCP2890DMR2
U402
BYPASS
5600p
C426
RCVP
10u
C425
C429
1000p
R4285.6K
RCVN
C430
1000p
R426
20K
100nH
L402
L401
100nH
C4275600p
R431
20K
SPK_RCV+
SPK_RCV-
LINE_P
LINE_N
+VPWR
SPK+
SPK_AMP_EN
SPK-