Samsung SM-A507FN Service Manual page 100

8. Level 3 Repair
8-4-24. GSM 850/900, WCDMA B5/8, LTE B5/8/20/28 DRx
It is not catching the channel
In normal condition
Check ant path any damage
(ANT2006~U2003)
Check RX path any damage
(U2003~U2001)
Check U2001, U2004
(Crack, open, etc), is it ok?
Change the board
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YES
Is it ok?
)
YES
Is it ok?
YES
any damage
i
YES
YES
END
NO
Resolder or change
Antenna path components
NO
Resolder or change
RX path components
NO
Resolder or change
U2001, U2004