LG KG920 - Page 81

(4) Checking RX IQ
4. TROUBLE SHOOTING
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TEST POINT
CIRCUIT
WAVEFORM
C523
C526
U502
(GPO_20)
(GPO_19)
(GPO_21)
39p
C526
0.1u
C521
C522
100p
XOUT
8
L1 L2
_PDN
9 10
_RESET
2
_SEN
EN
EP
PN
PP
16
RFOH
RFOL
15
SCLK
1
3
SDIO
VDD1
12 13
VDD23
4
11
VIO
V
DE
SI4210D
U502
BIN
6
BIP
7
BQN
4
BQP
5
GND
14
D
AN
AP
DN
DP
C520
22p
39p
C523
S_EN
S_CLK
IN
IP
QN
QP
S_DATA
CHECKING FLOW
Redownload software and calibration again
Similar?
No
Replace U501
Yes
Check C523,C526.
Check if there is any
Major difference
Refer to graph 4-3
Figure 4-12.
Figure 4-13.
Figure 4-14.
Graph 4-5.