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SAMSUNG SGH-A400 GMS.pdf		DUAL BAND GSM TELEPHONE 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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