Power On Trouble - LG GD910 Service Manual

5.2. Power on trouble

C225,C226,C228,C229,C230,C479 C209,C217,C218,C221,C232,C234,
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Start Start
Battery Voltage, higher Battery Voltage, higher
Than 3.2V? Than 3.2V?
YES YES
32.769KHz clock at X101 32.769KHz clock at X100
is ok? Click TP1 is ok? Click TP1
YES YES
26MHz clock at U502 is 26MHz clock at U404 is
ok? Click TP2 ok? Click TP2
YES YES
PWRON pin(TP3) is high PWRON pin(TP3) is high
Before push the end key? Before push the end key?
PWRON pin(TP3) is low PWRON pin(TP3) is low
when push the end key? when push the end key?
LDOs output(C219,C224, LDOs output(C223,C207,
C231,C232) of U202 C236,C237,C239) of U202
while push the end key while push the end key
is ok? is ok?
Power on is ok? Power on is ok?
END END
GD910 service manual
Change or Charging Change or Charging
NO NO
the Battery. the Battery.
NO NO
Check soldering Check soldering
or change X101 or change X100
NO NO
Check soldering or Check soldering or
Change U404, X400
NO
Resolder R318,320 Resolder R202
NO NO
Check KeyPCB's dome sheet
Check soldering R220,
Or NO.4 pin of CN301 Q202 or change Q202
NO NO
Check soldering or change Check soldering or change
U202 and relevant component U200 and relevant component
NO NO
Change the main board
Change the main board
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5. Trouble shooting
GD910 service manual
LGE Internal Use Only