Gsm 850/900, Wcdma B5/8, Lte B5/8/20 Tx Troubleshooting - Samsung SM-M307F Service Manual

8. Level 3 Repair
8-4-27. GSM 850/900, WCDMA B5/8, LTE B5/8/20 Tx
It is not catching the channel
In normal condition
Check ant path any damage
(ANT9101 ~ ANT9009)
Is it ok? (SUB PBA)
Check RX path any damage
(RFS1000~U1002)
Check TX path any damage
(PAM1001~U1002)
Check U2016, PAM1001
(Crack, open, etc), is it ok?
Change the board
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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
TX path components