Speaker Trouble - LG C1150 Service Manual

4. TROUBLE SHOOTING

4.7 Speaker Trouble

Test Points
C408
Circuit Diagram
VMEM
R401
13MHZ
MIDI_RESET
ADD00
RD
MIDI_CS
R403
10K
WR
MIDI_INT
DATA08
DATA09
DATA10
DATA11
DATA12
DATA13
DATA14
DATA15
C404
R405
1000p
C405
R406
C410 0.1u
CN201
These five components
make up the amplifier and
the filter stage of melody.
[C401, R402, C403, R404]]
U401
YMU759B
0 1
11
CLK1 HPOUT_R
4
10
_RST
30 HPOUT_L
C401
A0
R402
31 12
EQ1
_RD
29
0.01u
_CS 39K
5
13
EQ2
IFSEL
C403
28
_WR
3
100p
_IRQ
R404 150K
27 14
EQ3
D0
26
2
D1 EXT1
25
19
D2 EXT2
24
D3 Speaker path
23
D4
22
17
D5
SPOUT1
21
D6
20
D7
3.3K
PLLC SPOUT2
6
18
VBAT
0.1u
VREF
9
SPVDD
15
SDOUT
10K 32
VDD
C409
7
0.1u
16
VSS SPVSS
8
(16 Poly MIDI)
vibrator
R402
C403
U401
Figure 4-19
Analog switch for select audio path or midi path.
LMS4684ITLX
C406 C407
47p 47p
receiver path
R408
RECP
4.7
R409
RECN
4.7
C411 C412
47p 47p
- 74 -
speaker
Soldering
check
VBAT
C402
1u
To the speaker at LCD module
U402
via CN201.
A3 C3
NO1 IN1 SPK_RCV_SEL
A1 C1
NO2 IN2
D3 B3
NC1 COM1 SPK_REC_P
D1 B1
NC2 COM2
C408 47p
R407 100K
SPK_REC_N