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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
GW520 service manual
5.2. Power on trouble
END
Battery Voltage, higher
Than 3.35V?
32.769KHz clock at
X100 `is ok? Click TP1
26MHz clock at U504
is ok? Click TP2
PWRON pin(TP3) is high
Before push the end key?
PWRON pin(TP3) is low
when push the end key?
LDOs output(C210, C211,
C212 C215,C219, C220, C221,
C222, C223, C224, C225, 226,
C227,C228) of U200 while
push the end key is ok?
Power on is ok?
Start
Change or Charging
the Battery.
Check soldering
or change X100
Check soldering
or Change U504, X500
Resolder R203,208
Check KeyPCB’s dome sheet
or NO.18 pin of CN400
Check soldering or change
U200 and relevant component
Change the main board
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
END
Battery Voltage, higher
Than 3.35V?
32.769KHz clock at
X100 `is ok? Click TP1
26MHz clock at U504
is ok? Click TP2
PWRON pin(TP3) is high
Before push the end key?
PWRON pin(TP3) is low
when push the end key?
LDOs output(C210, C211,
C212 C215,C219, C220, C221,
C222, C223, C224, C225, 226,
C227,C228) of U200 while
push the end key is ok?
Power on is ok?
Start
Change or Charging
the Battery.
Check soldering
or change X100
Check soldering
or Change U504, X500
Resolder R203,208
Check KeyPCB’s dome sheet
or NO.18 pin of CN400
Check soldering or change
U200 and relevant component
Change the main board
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO