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Now downloading free: SAMSUNG SGH-A400 GMS.pdf
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SGH-A400
SERVICE
5.Flow Chart of Troubleshooting and Circuit Diagram
5-1 SGH-A400 Power ON
`POWER ON' does not work Y
Check the current consumption more than 100 mA
N
Download again
Y Check the Battery Voltage more than 3.3V Y
N
Charge the Battery
Check the pin 38 of U400 is more than 3.2 V Y
N
Check to the path from CN604 to pin 38 of U400 and keypad
U400 pin 33,28,30 = 2.8V
N
Change U400
Y
Check the clock signal at R105
N
Check the clock generation circuit (related to U400 and OSC100)
Y Check the initial operation Y END
SAMSUNG Proprietary-Contents may change without notice 5-1
SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram
5-2 SGH-A400 Initial
Initial Failure Y
Check the "Reset_B" signal at the pin 6 of U8016 is "High"
N
Check the U100 (IA)
Y
Check the pin 10 of U400 is "High"
N
Check the U201 (M46)
Y
Check the pin 11 of U400 is "High"
N
Check the U400 (PMIC)
Y Check the connections and initialization using Factor |
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