3. TROUBLE SHOOTING
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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
2.2u
C1824
C1826
4.7u
0.5p
L181
0
C1825
2.2u
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
10n
C1850
RFFE1_CLK
RFFE1_DATA
WTR_B40_TX_HB2
TP1
TP2