LG L601i Service Manual page 78

WCDMA
TP2
C609 NA
R642
0
C608 1.2p
ANT
8
FL509
SAYDT1G95AF0B00R05
TP3
2.2p
R637
NA C171
C168 NA
IN COUP
2 3
OUT 50OHM
1 4
R132 1K C186 100p
R133
PA_ON
10K
TX
RX
For testing, Max power output is needed.
Set the Phone Tx is ON
and PDM is 450
YES
Check TP1
Over 21dBm ?
NO
YES
Check TP2
Over 19dBm ?
NO
YES
Check TP3
Over 16dBm ?
NO
YES
Check TP4
Over -5dBm ?
NO
Change the board
- 79 -
4. TROUBLE SHOOTING
AWT6277R U606
11
GND5 Close to Pin 1 Close to pin 10
10 1
VCC2 VCC1
9 2
GND4 RFIN
8 3
RFOUT GND1
7 4
GND3 VMODE
6 5
GND2 VREF
TR100
KRX102E
PA_ON
C174
0.01u
HDET
U106 LMV225TLX
A1 A2
RFIN_EN VDD VREG_RFTX_2.85V
B1 B2
HDET1
GND OUT
C188 C189
1200p 27p
ILNA_OUT
RF Tx Level is OK
Check FEM
Check Duplexer
Check PAM Block
Refer to 3.5.4
TP4
+VPWR
C164
3.3nH
R128
PA_R0
C169
0
NA
VREG_RFTX_2.85V
13
PLNA_OUT
14
ILNA OUT