Samsung SGH-i450 Service Manual page 68
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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Flow Chart of Troubleshooting
9-14. EGSM TX
TX ON (PCL 5 level)
①
F101 pin11
>=5 dBm
No
②
F101 pin17
>=5 dBm
No
③
PAM100 pin9
>=5 dBm
No
④
PAM100 pin7
>=-30 dBm
Pin#3(BS)=L
No
Pin#1(EN)=H
⑤
Check U101
END
Yes
Resolder RFS101,
C105,L101,R105,L132
Yes
Check
F101 truth
Yes
Resolder or Change
F101,C100,L115
⑦
Yes
Check Vramp
No
Operating
1.
Check FEM(F101) output
2.
Check FEM(F101) input
3.
Check PAM(PAM100) output
4.
Check PAM(PAM100) input
5.
Check RTR6275(U101)
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No
table
Yes
OK
Check
Yes
mode
No
9-26
Pin#6: High
Pin#5: Low
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
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