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6. SGH-A500 Flow Chart of Troubleshooting and Circuit Diagrams
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1. Power On
"power on" does not work
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Check the Parts connected
with Vbat directly
END
No
Yes
check the current consumption
about 30mA < I < 500mA ?
Check the Battery voltage
more than 3.3V ?
Yes
No
check the current consumption
more than
1A ?
No
Yes
Charge the Battery
Check the Output voltage
of E-power(U601).;
-VANA(pin #3) = 2.39V
-VINT(pin #24) = 2.62V
-VSIM(pin #21) = 2.85V
-V3V(pin #22) = 2.85V
-VRF 2(pin #37) = 2.85V
No
Check the U601
Check the clock signal
at pin #3 of OSC202;
FREQ, = 13MHz ?
Yes
No
Check the OSC 202 & clock circuit
Check the U401 & U302 & initial operation
Yes