LG LG-D618 - Page 26

3. TROUBLE SHOOTING
- 26 -
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Only for training and service purposes
LGE Internal Use Only
Schematic of the Crystal Part (19.2MHz)
Check TP1
(VREG_XO)
19.2 MHz Signal
1.9V ≥ VREG_XO ≥ 1.7V
Check soldering and
components
Check PM8226
No
No
Yes
Yes
Check TP2
(19.2 MHz)
XO OK
U4100
88
42
31
39
13
44
17
62
6
5
63
120
123
112
77
101
100
119
108
102
85
CBL_PWR_N
KPD_PWR_N
OPT_2
OPT_1
PS_HOLD
RESIN_IN
PON_RESET_N
SPMI_CLK
SPMI_DATA
XO_THERM
GND_XOADC
XTAL_19M_IN
XTAL_19M_OUT
GND_XO_BUFF
GND_XO
BB_CLK1_EN
RF_CLK1
RF_CLK2
BB_CLK1
BB_CLK2
SLEEP_CLK1
R4107 0
1nC4100
0R4103
R4102 0
R4108 0
TP4103
19.2MHz
X1E0002910001
X4100
4 3
21
XTAL1 GND/Therm
XTAL2Thermistor
DNI
C4101
DNI
C4102
R4110 0
R4105 0
R4104 10K
TOL=0.01
100KR4106
VREG_L12_1V8
0R4114
WTR0_XO_IN
XO_G_TCXO
SLEEP_CLK
BB_CLK
BB_CLK_EN
MSM_PS_HOLD
PMIC_SPMI_DATA
PMIC_SPMI_CLK
JTAG_PS_HOLD
MSM_RESIN_N
PM_KYPD_PWR_N
Please refer to 80-NC833-14 for more information.
BB_CLK has special layout and component requirements.
QCT Ref.checklist)(05/30)
Layout
PMIC -> CAP -> MSM
Note 1
TP1