4. TROUBLE SHOOTING
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Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
VREG_HPVDD_1.8V
HS_MIC_BIAS
HS_MIC_BIAS_TEMP
1u
C571
4.7u
L504
L503
4.7u
4.7u
L502
2.2u C535
VREG_LCD_1.8V
C546
1u
L501
4.7u
C528
4.7u
DNI
C536
CM315_12_5PF
X500
32.768KHz
2
1
0.1u
C549
VREG_MSME_1.8V
C540
2.2u
VREG_TOUCH_3.0V
VREG_RF_2.7V
E10
F10
C12
M12
K7
N13
M13
G10
D9
H12
C13
A13
A12
G12
G1
M1
D13
E12
N11
A3
A10
A8
H13
G13
A11
K13
E13
B13
A9
N12
J13
A2
M4
N4
M9
N10
M6
N6
M8
N8
J1
K1
VSW_5V
VREG_5V
VSW_MSMC1
VREG_MSMC1
VSW_MSMC2
VREG_MSMC2
VSW_MSME
VREG_MSME
VSW_PA
VREG_PA
VREG_GP1
VREG_GP2
VREG_GP3
VREG_GP4
VREF_GP5
VREG_GP6
VREG_MMC
VREG_MSMA
VREG_MSME2
VREG_MSMP
VREG_RFRX1
VREG_RFRX2
VREG_RFTX
VREG_RUIM1
VREG_SYNT
VREG_TCXO
VREG_USB
VREG_WLAN
MIC_BIAS
REF_ISET
REG_GND
REF_BYP
TCXO_IN
TCXO_EN
TCXO_OUT
XTAL_IN
XTAL_OUT
SLEEP_CLK
AMUX_OUT
KPD_PWR_N
PON_RESET_N
PS_HOLD
121K
R509
D501
22p
C515
VREG_TCXO_2.85V
51
R510
1n
C524
2.2u
C537
2.2u
C539
C521
1n
C544
2.2u
VREG_MSMC1_1.25V
R515
200K
1n
C523
VREG_RUIM_3.0V
C526
4.7u
C547
2.2u
C538
2.2u
VREG_MSMA_2.6V
4.7u
C527
1u
C548
VREG_MSMC2_1.25V
VREG_SMPS_2.1V
C522
1n
1u
C545
10u
C520
VREG_MSMP_2.6V
4.7u
C542
22u
C525
C543
2.2u
VREG_MMC_3.0V
4.7u
C541
C500
22p
VREG_AUX2_2.9V
VREG_MOTION_3.0V
VREG_LCD_2.8V
C570
33p
C566
1u
D500
+VPWR
L500
2.2u
+VPWR_AUDIO
10u
C530
1n
C529
SLEEP_CLK
TCXO_PM_19.2MHZ
PS_HOLD
AMUX_OUT
PMIC_TCXO
TCXO_EN
PM_ON_SW
JTAG_PS_HOLD
VSNS_MSME_1.8V
VSNS_MSMC2_1.25V
nPON_RST
VSNS_MSMC1_1.25V
0.5mm
Place crystal and load caps close to PM7540
1%
Local Ground Plan
Place in PM7540 room at shield edge
0.6mm
0.6mm
These CAPs close to inductors
0.6mm
Route together
0.3mm 0.3mm
C308
10n
R310
33
100
R303
19.2MHz
KT3225L19200DCW28RA0
X300
4
2
3
1
VCONT
OUT
GND
VCC
C301
0.1u
C320
330p
C307
330p
R319
1
C309
330p
C300
1n
VREG_TCXO_2.85V
VREG_MSMA_2.6V
C310
0.1u
U301
3
2
4
1
5
VCC
GND
R311
100K
TCXO_PM_19.2MHZ
TCXO_EN
TCXO_RTR_19.2MHZ
USBH_SYSCLK
RTR_TRK_LO_ADJ
FFA Rev.C(220Ohm@100MHz)
1.0T
TCXO Circuit
Clesed to TCXO
TP2
TP7
TP3
TP5
TP4
TP10
TP9
TP6
TP8