LG -E977 Service Manual page 70

TP3
C1022
PA_DET_MMMB
3.3p
L1030
L1029
15n
8.2n
PA_DET_1
Set the phone Tx is On and PDM is 90
LGE Internal Use Only
+VSMPS
C1019
2.2u
U1001
11
PGND
10 1
VCC VBAT
9 2
RF_OUT RF_IN
8 3
CPL_IN VMODE1
7 4
GND VMODE0
R1016
6 5
CPL_OUT VEN
DNI
Check TP3
Over 21 dBm?
No
Check TP2
PA_R1≥2.6V?
No
Check TP1
Over -3 dBm?
No
Change the board
+VPWR
C1021
2.2u
TP2
C1023 33p C1024 33p
PA0_R0
PA0_R1
L1027
PA_ON4_U1900
2.7n
VEN
Yes
RF TX Level is OK
Yes
Check MDM9615M
Yes
Check WTR1605L
- 70 - Copyright © 2013 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
TP1
FL1003
C1025
4 1
OUT IN
G3 G2 G1
82p
5 3 2
Only for training and service purposes
L1026
2.2n
L1028
5.6n