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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
LGE Internal Use Only
CHECKING FLOW
Table 4.2.1
Check R514, R515, C512
Check whether Ant SW
Set as RX mode
i
Refer to Table 4.2.1
Yes
Check SW501 Pin ANT, RF
with RF Cable connected.
Open
Yes
Check SW501 Pin ANT, RF
with No RF Cable Connected
Short
Yes
Changing SW501
For these 2 test case,
No Call connection is needed
Check RF Level of
U502.14(for GSM850) ,
U502.13(for EGSM),
U502.12(for DCS1800) &
U502.11(for PCS1900)
Ant SW & Mobile SW is OK
See next Page to check
Rx I/Q Signal
Pin 14, 15 : ~ -62dBm
Pin 13, 12 : ~ -63dBm
Yes
No
For this RF Level test case,
RX Stand alone Mode is needed refer to
chapter 10
Check ANT_SW1, 2 & VBAT
Changing the Board.
Changing SW501
Changing U502.
No
No
No