LG KG920 - Page 84

(2) Checking TX IQ
4. TROUBLE SHOOTING
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TEST POINT
CIRCUIT
C523
C526
U502
Figure 4-19.
(GPO_20)
(GPO_19)
(GPO 21)
39p
C526
0.1u
C521
C522
100p
XOUT
8
_PDN
9 10
_RESET
2
_SEN
SC
3
SDIO
VDD1
12 13 11
VIO
210D
502
BIN
6
BIP
7
BQN
4
BQP
5
C520
22p
39p
C523
S_EN
S CLK
IN
IP
QN
QP
S_DATA
CIRCUIT
Redownload the Software
And calibrate
Check if there is
Any
Major Difference
Refer to Graph7
Similar?
Yes
No
Replace U101
Figure 4-20.
Figure 4-21.
WAVEFORM
Graph 4-7.