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SGH-X450 Flow Chart of Troubleshooting
7-2
2. Initial
The pin#9 of U300 = 1.8V and
the pin#11 of U300 ≒ 2.825V ?
Initialization Failure
Check the U300
(If it has some problem, adjust it.)
END
No
Yes
Is the pin#19 of U300
"Low -> High"?
Yes
Check the U400
32.768kHz wave forms at
the C414 and C416
Check the LCD Part
Yes
No
No
Yes
Yes
Yes
The Voltage is "High" at
the C307
Check the Audio Part
No
Check the U300
(If it has some problem, adjust it.)
Check the U300
The pin#22 of U300 is
"High"
Check the U300
LCD display is O.K
No
No
Yes
Yes
Sound is O.K
No