No Service - Samsung SM-J710FN Service Manual

8. Level 3 Repair

8-4-3. No Service

Check menu setting
Settings → Mobile networks → Network mode → Is setting auto connect ?
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No service
Yes
Home screen → Phone → Keypad
→ *#1234# → check Phone version
→ CP : T285XXXX or unknown
CP : unknown
Check the voltage level
C2049 = 1.8V C2050 = 1.2V
C2050 = 1.2V C2052 = 1.2V
C2054 = 1.2V C2057 = 1.2V
C2036 = 1.8V C2059 = 1.8V
Yes
Check TCX2000
Frequency = 26MHz
Yes
Replace UCP400
Yes
END
www.AppleUnlockStore.com
CP : J710XXX
Check the connection of RF coaxial cable
No
Replace the U2002
No
Replace the TCX2000