Samsung SGH-E300 Troubleshooting

2. SGH-E300 Flow Chart of Troubleshooting

1.Baseband

1. Power ON

'Power On' does not work

Yes

Check the current consumption more

than 100mA

Yes

Check the Voltage

more than 3.3V

Yes

Check the pin

11 of U102 is more

than 2.8V

Yes

U102 pin 33,39

=2.8V

Yes

Download again

Charge the Battery

Check U102 and C117

U102 pin 9

=1.8V

Yes

Check U102 and C116

Check the clock signal at pin4 of

OSC801

Freq=13MHz ?

Vrms≥300mV ?

Vpp is around

900mVpp ?

Yes

Check the initial operation

END

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Check the clock generation

circuit

2-1

SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams

2. Initial

Initial Failure

Yes

Check the signal at the

pin19ofU102is

"High" when the phone

is boot on

Yes

Check the pin 25 of

U100 is "High"

Yes

Check the pin 4 of

OSC801 is around 2.8V

Yes

Check LCD connector CN201,

and resolder bridge

Yes

END

Check U102

Check the U701

Check the soldered status of

OSC801,R801,U102

3. Sim Part

Phone can't access SIM card

Yes

Check the pin 1 of

CN100. voltage 3V ?

Yes

Check the SIM

connector's (CN100)

connection to SIM

card

Yes

Check the circuit around CN100

Check the circuit around U601

and vlotage supply circuitry

input

circuitry

Yes

output

Yes

END

2-2

Check the circuit related to

Resolder or change CN100

Check the related circuit of

CN100

Check the related circuit of

U601 and U102

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U102

4. Charging Part

SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams

Abnormal charging part

Yes

Check the pin 17, 18

of CN300 is

TA_VEXT>4?

Yes

Check the pin 2 of

Q102 is "low"?

Yes

Check the pin 3 of

Q100 is "low"?

Yes

Check the pin 5 of

Q102 is "3.2~4.2V"?

Yes

Check the ICHRG is

1V(during charging)

and around 180mV(full

charging)?

Replace TA,Check CN300

Check the Q102

Check the Q100

Check the Q102

Resolder or change R102

Yes

END

2-3

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams

( Picture 1)

2-4

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams

(Picture 2)

2-5

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams

(Picture 3)

2-6

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