Speaker Trouble - LG KG110 Service Manual

4.10 Speaker Trouble

R272
U201
C290
U202
Test point 1
CIRCUIT DIAGRAM
CIRCUIT DIAGRAM
C290 1u
SPK_P
C291 1u
SPK_N
AMP_SHDN
AMP_SHDM
SPK_RCV_P
SPK_RCV_N
CHECKING FLOW
VBAT
C280
1u
U202
MAX9718
R275 0 4 10
IN+ OUT+
R276 0 2 6
IN- OUT-
1 5
SHDN BIAS
3 8
SHDM NC
R283 NA
R284 NA
C272
39p
C273 C274
39p 39p
VEXT
AUDIO
C271
1u
C4
NO1
A4
NO2
C1
RCV_P
NC1
A1
RCV_N
NC2
C277
0.1u
61
4. TROUBLE SHOOTING
R271
C291
Test point 2
U201
MAX4684EBC_T
C2
SPK_RCV_SEL
IN1
A2
IN2
C3 R271 0
COM1
A3 R272 0
COM2
R280
(FOR TUNING NOISE)
10K
RC201
RC202
SPK_RCV_P
SPK_RCV_N