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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
4.3.4 Checking GSM Tx part
Checking Points
TP1
TP2
TP3
TP4
TP5
TP2, 30dBm over?
TP3, 33dBm over?
Re-download & Calibration
Remove U101 and check
the power of pin1, pin8.
(on board)
Yes
No
Is the level of
TP4, TP5 same
to Table.1?
TP4 : Check U201
TP5 : Check VBAT Line
Yes
No
Setup Test Equipment
Cell Power = -60dBm
Tx Power Level Set
(GSM=5, DCS=0, PCS=0)
Checking Flow
Check TP1
GSM850, EGSM 32dBm
DCS, PCS 29dBm
over?
The power of pin1, pin8
Is over 0dBm?
Check U201
No
Yes
No
Replace U101
Yes
Yes