Level 3 Repair
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8-113
Check U104 at sub b'd :
About 23dBm ?
8-3-42. LTE Band20 TX
Check C100 at main b'd :
About 23dBm ?
Check C172 :
About 23dBm ?
YES
NO
YES
NO
YES
NO
Check L147
About 0dBm ?
Check the voltage at C153 > 1.0V
if yes, resolder or change L147, F103, C171, PA102
if no, resolder or change L300, U301, L301
YES
NO
Check the voltage at
C303 = 2.0V
&
C320 = 1.8V
&
C302 = 1.3V
Resolder or change
U400
Check the freq. at
OSC400 PIN 1 :
19.2MHz ?
Change or resolder
OSC400
Resolder or change
U501
END
NO
YES
NO
YES
CONTINUOUS TX ON CONDITION
APPLIED
LTE Band7 CH : 24300
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
CHECK soldered
C104 , U113, ANT101
Re-assembe coaxial cable or
Check solder state RFS100, ANT100, C100
Check the voltage at C104=2.8V
if yes, resolder or change L172, F101
if no, resolder or change U400
