Flow Chart Of Troubleshooting And - Samsung SGH-A800 Service Manual

5. Flow Chart of Troubleshooting and Circuit Diagram
5-1 Power ON
5-1
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'POWER ON'does not work
Yes
Check the Battery Voltage
is more than 3.4V?
Yes
The node
between D101 and C106 > 2.8 V ?
Yes
When the "END" key is pressed,
D100 pin1 > 3.4V ?
Yes
U111, U112 pin5 = 2.5V ?
Yes
Check for the clock signal at R609
Yes
Check the initial operation
END
manuals search engine
No
Charge the Battery
No
Check U100 and the path from +VBATT
to C106
No
Replace the PBA
No
Check U111, U112 and related circuit
No
Check the clock generation circuit
(related to U502 and U601)
Flow chart of Troubleshooting and Circuit Diagram