LG LG-D855 - Page 120

3. TROUBLE SHOOTING
- 120 -
Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Check TP1
+1V8_VREG OK?
Check TP2
0.5V≤TP2≤4.2V?
START
Check next step
Yes
Yes
No
No
The Problem may be Other part
Check Logic part
Check DC-DC Power Block Refer to 3.3
2.2uC1824
C1826 4.7u
0.5p
L1810
C1825 2.2u
L1811
3.3n
RF7940
U1803
6
4
8 3
7
10 1
29
5
11
PGND
SDATA
RF_OUT RF_IN
VCC1VCC2
GND
VBATTNC
VIO
SCLK
VREG_BOOST_BYPASS
+1V8_VREG_S3A
+VPA0
C1819 1.8p
C1820
100p
12
10n
C1850
RFFE1_CLK
RFFE1_DATA
WTR_B40_TX_HB2
TP1
TP2