Sim Part - Samsung SGH-A800 Service Manual

5-4 Sim Part

Phone can't access SIM card
Check SIMCLK Signal on CN100 pin 3
CN100 pin 2 = "H(SIMRST) ?
5-7
Yes
U101 pin 6 = 3 V ?
Yes
U101 pin 5 = "H" ?
Yes
U101 pin 2, 3 = 3 V ?
Yes
CN100 pin 1, 5 = 3 V ?
Yes
After Power ON,
in a few second
Yes
After SIM card insert,
Yes
END
No
Resolder R101
No
Replace the PBA
No
Replace U101
No
Resoldering CN100
and check open connection
from U101 to CN100
No
Replace PBA
No
Replace the PBA
Flow chart of Troubleshooting and Circuit Diagram