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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. Trouble shooting
GD910 service manual
Checking Flow
Is the level
of TP4~5 same to Table.1?
TP4: check U102
TP5: check VBAT line
Check TP2,TP3
TP2(GSM) 33dBm over?
TP3(DCS, PCS) 30dBm over?
NO
YES
NO
YES
Setup Test Equipment
Cell Power = -60dBm
Tx
Power Level set
(GSM=5,DCS=0,PCS=0)
GSM Tx
Path is OK
Remove U402 and
Check the power of
pin2,pin7 (on board)
Check TP1
EGSM 900 31dBm
DCS1800 29 dBm
PCS1900 29 dBm
Over?
The power of pin2,pin7
is 0~3dBm?
YES
Check U404
or
Replace U404
YES
Replace
U402
Checking Flow
Check TP2,TP3
TP3(DCS, PCS) 30dBm over?
NO
YES
NO
YES
Setup Test Equipment
Cell Power = -60dBm
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TP1
TP3
TP2
TP6
TP4
TP5
Checking Point
Checking Point
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TP1
TP3
TP2
TP6
TP4
TP5
Checking Point
Checking Point
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TP1
TP3
TP2
TP6
TP4
TP5
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TP1
TP3
TP2
TP6
TP4
TP5
Checking Point
Checking Point
GD910 service manual
5.14.4 Checking GSM Tx part
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Checking
Flow
Checking
Point
Содержание GD910
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