3. TROUBLE SHOOTING
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3.7.3.7 Checking RF signal path (B40)
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TP2
TP1
U1803
2.2u
C1824
C1826
4.7u
L1809
8.2n
1.5p
L180
8
0.5p
L181
0
C1825
2.2u
FL1801
5 3 2
4
1
IN
OUT
G1
G2
G3
L181
1
3.3n
RF7940
U1803
6
4
8
3
7
10
1
2
9
5
11
PGND
SDATA
RF_OUT
RF_IN
VCC1
VCC2
GND
VBATT
NC
VIO
SCLK
VREG_BOOST_BYPASS
+1V8_VREG_S3
A
+VPA0
C1819 1.8p
C1820
100p
1
2
C1823
4.7n
10n
C1850
C1818
3.6n
DNI
L185
6
C1845
3.3n
RFFE1_CLK
RFFE1_DATA
ANT_TX_B40
WTR_B40_TX_HB2
TP2
TP1