LG KG800 - Page 67

(6) Checking TX IQ
4. TROUBLESHOOTING
- 68 -
VBAT
Q+_TX_Q+
5
4
Q-_TX_Q-
VAPC
9
6
VCC1
VCC3
1
11
PCO2 PCO3
67 68
PCO4
PED_SELECT
7
2
I+_TX_I+
I-_TX_I-
3
64
NC_RX_I+
NC_RX_I-
63
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
Redownload the Software
And calibrate
Check if there is
Any
Major Difference
Refer to Graph 4
-8
Similar?
Yes
No
Replace U602
TEST POINT
CIRCUIT
Checking Flow
Waveform
Graph 4-8