LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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C548
C549
U502
FB501
FB500
NA
C550
0.1u
C514
C535
1u
C532
1u
R2_GPIO3
6
RIN
5
4
RIP
ROUT1
29
ROUT2
23
16
SCLK
SDIN
17
27
VMID
DACDAT
10
DBVDD
14
DCVDD
13
12
DGND
L2_GPIO2
3
LIN
2
1
LIP
LOUT1
30
25
LOUT2
7
LRC
11
MCLK
MICBIAS
32
18
MODE
OUT3
22
21
OUT4
33
PGND
U502
ADCDAT
9
28
AGND1
24
AGND2
AUXL
19
AUXR
20
31
AVDD1
AVDD2
26
8
BCLK
15
CSB_GPIO1
4.7u
C520
WM8983
C533
4.7n
R511
18K
R533
0
10u
C525
C534
1u
10u
C513
100K
R519
4.7n
C542
NA
C531
1K
R516
R510
1K
C541
1u
1u
C549
1u
C548
C536
1u
C518
4.7u
C539
1u
12n
C547
C524
0.1u
NA
C544
C519
0.1u
C551
NA
C521
0.1u
C543
NA
12n
C530
18K
R517
C516
4.7u
C517
0.1u
MIC_PWR
MMP_A_MCLK
CODEC_I2C_SCL
CODEC_I2C_SDA
HP_R
HP_L
HP_EAR_L
MIC2P
HP_EAR_R
MID_MICP
SPK_L
SPK_R
FM_AUDIO_L
FM_AUDIO_R
MMP_A_BCLK
MMP_ADO_DACDAT
MMP_A_LRCLK
MMP_ADI_ADCDAT
SPK_OUT-
VREG_5V
VREG_WM_2.7V
VREG_MSME_1.8V
MIDI_3.3V
Schematic of voice path
U502
Summary of Contents for U990
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