Samsung SGH-i450 Service Manual page 62
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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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Flow Chart of Troubleshooting
9-12. WCDMA TX
TX ON
Target Power = 23dBm
①
F101 pin11
>=10 dBm
No
②
F101 pin9
>=8 dBm
No
③
F104 pin7
>=5 dBm
No
④
PAM101 pin8
>=-15 dBm
No
⑤
PAM101 pin2
>=-30 dBm
No
⑥
F103 pin1
>-30dBm
⑦
No
Check U101 & UCP201
END
Yes
Resolder RFS101,
C105,L101,R105,L132
Yes
Check F101
truth table
Yes
Resolder or Change F104,
C165,C197,L129
Yes
Check UCP201
Check
Yes
Operating
mode
Yes
Resolder or change
F103,L120
1.
Check FEM(F101) output
2.
Check FEM(F101) input
3.
Check Duplexer(F104)
4.
Check PAM(PAM101) output
5.
Check PAM(PAM101) input
6.
Check Tx Filter(F103) input
7.
Check RTR6275(U101), MSM6260(UCP201)
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Pin#6: High
Pin#5: Low
Pin#4: High
Check R107,R110,
R116,UCP201(MSM)
No
Yes
Resolder or Change
Pin#3(VMode2)=L
⑧
Pin#4(VMode1)=L
No
Check VBAT or
Resolder or Change
Yes
9-20
F101
Pin#3(VENA)=H
Check
UCP201
PAM101
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