Gsm 850/900, Wcdma B5/8, Lte B5/8/12/13/17/20/28 Tx - Samsung SM-A505F Service Manual

8. Level 3 Repair

8-4-27. GSM 850/900, WCDMA B5/8, LTE B5/8/12/13/17/20/28 TX

It is not catching the channel
Check ant path any damage
(ANT9004 ~ ANT9000)
Check TX path any damage
Check TX path any damage
Check U1008, U7066
(Crack, open, etc), is it ok?
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In normal condition
YES
Is it ok? (SUB PBA)
YES
(RFS1000~U1003)
Is it ok?
YES
(U1003~U1008)
Is it ok?
YES
any damage
YES
Change the board
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
U1008, U7066