LG LG-D855 - Page 113

3. TROUBLE SHOOTING
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Check TP1 +1V8_VREG OK?
Check TP2 0.5V≤TP2≤4.2V?
Check U1653 physical damage
or soldering condition
And change C1653 to 100 pF
START
Check next step
Yes
Yes
No
No
The Problem may be Other part
Check Logic part
Check DC-DC Power Block
Refer to 4.3
DNI
L1607
FL1600
2655MHz
7
6
5 9
3 8
2
1
4
ANT
TX
GND1
GND5GND2
GND6GND3
GND4
RX
L1606
100p
L1610
0.75p
0.5p
L1611
L1608
3.3n
1.5n
L1754
2
1
8.2p
C1753
L1753
100p
12
100p
C1857
12
C1603
1.5n
ANT_TRX_B7
WTR_B7_PRX_HB3
TP2
TP1
Yes