LG -D618 Service Manual page 26

Schematic of the Crystal Part (19.2MHz)
VREG_L12_1V8
X4100
X1E0002910001
4 3
Thermistor XTAL2
1 2
XTAL1 GND/Therm
19.2MHz
TP1
BB_CLK
Note 1
SLEEP_CLK
LGE Internal Use Only
BB_CLK has special layout and component requirements.
R4110 0
R4114 0
Check TP1
(VREG_XO)
1.9V ≥ VREG_XO ≥ 1.7V
Yes
Check TP2
(19.2 MHz)
19.2 MHz Signal
Yes
XO OK
PM_KYPD_PWR_N
JTAG_PS_HOLD
Layout
PMIC_SPMI_CLK
PMIC -> CAP -> MSM
PMIC_SPMI_DATA
Please refer to 80-NC833-14 for more information.
No
Check PM8226
No
Check soldering and
components
- 26 - Copyright © 2014 LG Electronics. Inc. All right reserved.
3. TROUBLE SHOOTING
85
CBL_PWR_N
102
KPD_PWR_N
108
OPT_2
119
OPT_1
100
R4104 10K
PS_HOLD
MSM_PS_HOLD
101
R4105 0
RESIN_IN
77
TP4103
PON_RESET_N
MSM_RESIN_N
112
R4107 0
SPMI_CLK
123
R4108 0
SPMI_DATA
QCT Ref.checklist)(05/30)
120
XO_THERM
63
GND_XOADC
5
XTAL_19M_IN
6
XTAL_19M_OUT
62
GND_XO_BUFF
17
GND_XO
44
BB_CLK_EN BB_CLK1_EN
13
WTR0_XO_IN
RF_CLK1
39
RF_CLK2
XO_G_TCXO
31
BB_CLK1
42
BB_CLK2
88
SLEEP_CLK1
Only for training and service purposes
U4100