Samsung SGH-i450 Service Manual page 65
Gsm telephone
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Also See for SGH-i450:
- User manual (112 pages) ,
- User manual (7 pages) ,
- Quick start manual (7 pages)
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9-13. WCDMA RX
RX ON
Sector Power = -50dBm
①
F101 pin11
>=-65dBm
Yes
②
F101 pin9
>=-70 dBm
Yes
③
F104 pin5
>=-75 dBm
Yes
④
U101 pin26
>=-75 dBm
Yes
⑤
U101 pin29
>=-75 dBm
Yes
⑥
U101 pin34,35
>-75dBm
⑦
Yes
Check U101 & UCP201
END
No
Resolder RFS101,
C105,L101,R105,L132
No
Check F101
truth table
No
Resolder or Change F104,
C165,C197,L129
No
Resolder or Change
R103,C106
No
Resolder or Change
No
C141,C145,C144,L112,L114,F106
,L117,C143,L113
1.
Check FEM(F101) input
2.
Check FEM(F101) output
3.
Check Duplexer(F104)
4.
Check RTR6275(U101) input
5.
Check RTR6275(U101) output
6.
Check RTR6275(U101) I/Q input
7.
Check RTR6275(U101) , MSM6260 (UCP201)
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Pin#6: High
Pin#5: Low
Pin#4: High
Check R107,R110,
No
Yes
U101
⑧
Check
9-23
Flow Chart of Troubleshooting
R116,UCP201
Resolder or
Change F101
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