Samsung SM-A507FN Service Manual page 103

8. Level 3 Repair
8-4-27. GSM 850/900, WCDMA B5/8, LTE B5/8/20/28 Tx
It is not catching the channel
In normal condition
Check ant path any damage
(ANT9004 ~ ANT9000)
Is it ok? (SUB PBA)
Check TX path any damage
(RFS1000~U1003)
Check TX path any damage
(U1003~U2004)
Check U2004, U1003
(Crack, open, etc), is it ok?
Change the board
Confidential and proprietary-the contents in this service guide subject to change without prior notice
Distribution, transmission, or infringement of any content or data from this document without Samsung's written authorization is strictly prohibited.
YES
)
YES
Is it ok?
YES
Is it ok?
?
YES
i
any damage
YES
END
NO
Resolder or change
Antenna path components
NO
Resolder or change
TX path components
NO
Resolder or change
TX path components
NO
Resolder or change
U2004, U1003