Samsung SM-G975F Service Manual page 104

8. Level 3 Repair
8-4-15. MST
MST is not working
Check MST function ON
Check the Antenna contact
ANT8002, ANT8004
Check the battery level
Battery >= 5%
Type *#0*# -> MST Test On
Check voltage on C8129
Check the Status of U8025
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Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
END
No
Enable MST Function.
1. Resolder or Replace
No
ANT8002, ANT8004
2. Replace REAR
No
Charging the Battery
No
Resolder or Replace U8025
No
Resolder or Replace U8025