20061027083252687_SGH-Z650i-TSHOO-9.pdf

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9. Flow Chart of Troubleshooting

9-1. Baseband

9-1-1. Power ON

'Power ON' Does not work

Check the current consumption

Current consumption

≥ 100mA ?

NO

Download again

YES

Check battery voltage ≥ 3.3V ?

NO

Charge the Battery

YES

CheckD502isHigh

NO

Check D502

YES

The pin #3,5 of U501

≥ 3.3V ?

NO

Check the path of

D502 and U501

YES

Check U501

pin #32 ≒ 1.375 ?

pin #36 ≒ 1.8V ?

pin #50,56 ≒ 2.6V ?

pin #84 ≒ 2.85V ?

NO

Check the U501

YES

U501 Check

Pin #53 ≒ 19.2MHz?

Vpp ≥ 500mV?

NO

check the TCX800

YES

Check the initial operation

END

9- 1

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Flow Chart of Troubleshooting

9- 2

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Flow Chart of Troubleshooting

TRK_LO_ADJ

R802

C811

1

2

GND

VCON

TCX800

TCXO_2.85V

VCC

OUT

4

3

TCXO

C814

C815

9- 3

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Flow Chart of Troubleshooting

9- 4

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Flow Chart of Troubleshooting

9-1-2. Initial

Initial Failure

The pin #9 of U501

" Low --> High" ?

NO

Check the U501

YES

Check the Sleep X-tal signal's

at C524

NO

Check the OSC501

YES

Check the clock signal's

at R508

NO

Check the clock generation

circuit (related to U501 and

TCX800)

YES

LCD Display OK ?

NO

Check the LCD part

YES

NO

Sound operation OK ?

Check the Audio part

YES

END

9- 5

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