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