Flow Chart Of Troubleshooting - Samsung SCH-N500 Service Manual

7. Flow Chart of Troubleshooting

7-1 Logic Section
7-1-1 No Power
Press PWR button Press PWR button
Yes Yes
C240 + pin > 3.3volt? C243 + pin > 3.3volt?
Yes Yes
Q203 Pin1 "High" ? Q203 Pin1 "High" ?
Yes Yes
Q202 pin1,2,5,6 >=3.3volt? Q202 pin1,2,5,6 >=3.3volt?
Yes Yes
U204 VO2 =2.85volt U204 VO2=2.85volt
VO3=2.65volt
&
VO1=2.8volt?
VO1=2.65volt ?
Yes Yes
END END
No No
No No
No No
No No
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Check Battery and its neighboring Check Battery and its neighboring
circuits circuits
( V_BAT Problem ) ( V_BAT Problem )
Check U100,U204 and its neighboring Check U100,U204 and its neighboring
circuits circuits
( PS_HOLD Problem ) ( PS_HOLD Problem )
Check Q202 and its neighboring Check Q202 and its neighboring
( V_IN Problem ) ( V_IN Problem )
Check U204 and its neighboring Check U204 and its neighboring
( V_MSMP / V_MSMA Problem ) ( V_MSMP / V_MSMA Problem )
7-1
circuits circuits
circuits circuits