Baseband; Power On - Samsung SGH-T519 Service Manual

Gsm telephone

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10. Flow Chart of Troubleshooting

10-1.Baseband

'Power ON' Does not work

Check the current consumption

Current consumption

≥ 100mA ?

Check the V bat. voltage

Voltage ≥ 3.3V ?

Check the pins of UCD301

C316 ≥ 1.8V ?

C318 and C315 = 2.8V?

Check the clock signal

at pin #3 of TCX101 or C129

Freq.=26MHz,Vrms ≥ 300mV

Check the Initial operation

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C312=1.5V?

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10-1

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Charge the Battery

①

Check UCD301 and C316

②

Check UCD301 and C312

Check the clock generation

circuit (TCX101, U101 pin#4)

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