LG KG800 - Page 60

4. TROUBLESHOOTING
- 61 -
(4) Checking RX IQ
Redownload software and calibration again
Similar?
No
Replace U602
Yes
Check C619,C620.
Check if there is any
Major difference
Refer to graph 4-4
C413
C417
VBAT
Q+_TX_Q+
5
4
Q-_TX_Q-
VAPC
9
6
VCC1
VCC3
1
PCO2 PCO3
67 68
PCO4
PED_SELECT
7
2
I+_TX_I+
I-_TX_I-
3
PCO1
65 66
10
BAND SELECT
8
ENABLE
0.1u
C409
33p
C410
33p
C419
VBAT
39p
C417
C418
0.1u 3p
C420
C412
3p
22u
C411
39p
C413
IN
QP
QN
IP
TEST POINT
Checking Flow
Waveform
CIRCUIT
Graph 4-4