Table of Contents
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SGH-E400 Flow Chart of Troubleshooting and Circuit Diagrams
2. Initial
Check the signal at the
"High" when the phone
OSC801 is around 2.8V
Check and resolder LCD connector CN200
if there is solder bridhe between the pins
3. Sim Part
Phone can't access SIM card
Check the pin 1 of CN100.
Voltage = 3V?
Check the SIM
connector's (CN100)
connector's to SIM card
Check the circuit around CN100 input
Check the circuit around U601 output
and voltage supply circuitry
Initial Failure
pin 28 of U100 is
is boot on
YES
Check the pin 22 of
U100 is "High"
YES
Check the pin 4 of
YES
YES
END
NO
YES
NO
YES
NO
circuitry
YES
NO
YES
END
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NO
NO
NO
Check the soldered status of
OSC801, R803, U100
Check the circuit related to
Check the related circuit of
Check the related circuit of
4-2
Check U100
Check the U700
U100
resolder or change CN100
CN100
U601 and U100
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