Samsung SGH-i450 Service Manual page 72

Flow Chart of Troubleshooting
9-15. DCS/PCS TX
TX ON (PCL 0 level)
①
F101 pin11
>=0 dBm
No
②
F101 pin15
>=0 dBm
No
③
PAM100 pin16
>=0 dBm
No
④
PAM100 pin2
>=-25 dBm
No
⑤
Check U200
END
Yes
Resolder RFS101,
C105,L101,R105,L132
Yes
F101 truth
Resolder or Change
Yes
C119,L116 (PAM out)
⑦
Yes
Check Vramp
Pin#5(BS)=H
Pin#6(EN)=H
Operating
1.
2.
3.
4.
5.
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No
Check
table
Yes
F101,
OK
No
Check
Yes
mode
No
Check FEM(F101) output
Check FEM(F101) input
Check PAM(PAM100) output
Check PAM(PAM100) input
Check RTR6275(U101)
9-30
Pin#6: High
Pin#5: High
Pin#4: Low
Check
R107,R110,
R116,UCP201
Resolder or
Change F101
Resolder PAM100,
Check UCP201
Check VBAT or
Resolder / Change
PAM100
Resolder or change
R129,UCP201