Only For Training And Service Purposes - LG GM210 Service Manual

(3) Checking TX I/Q
TEST POINT
U500
TP2
Figure 4.6
WAVEFORM
CHECKING FLOW
Check C505(TP1), C507(TP2).
Check if there is any
Major difference
Refer to graph 4.2
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1
TP1
IP
C505
39p
IN
6M
TP1
TP1
TP2
Similar?
Yes
Redownload software and calibration
CIRCUIT
1
I
2
IB
3
VSUP_BBI
4
REF_SEL
5
SEL 26M U500
Graph 4.4
No No
again
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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4. TROUBLE SHOOTING
100p
0.1u
TP2
C507
30
39p
Q
29
QB
28
SCLK
27
SDATA
26
SEN
Replace U500
LGE Internal Use Only
TP2
QP
QN
S_CLK (GP
(GP
S_DATA
(GP
S EN