LG -T300 Service Manual page 105

4. TROUBLE SHOOTING
CHECKING FLOW
START
Check of ear_jack condition
A condition is good?
YES
Check condition of
matching components
(TP1,TP2)
A condition is good?
YES
Check Bias Voltage
VDD_FMR(C123)
YES
LGE Internal Use Only
NO
Replace J301
NO
Give the additory
solder in
(TP1,TP2)
NO Replace
U102
FM_radio will
work properly
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4. TROUBLE SHOOTING
START
Check of earless condition
Check condition of
CN205 connection
A condition is good?
YES
Check Bias Voltage MUIC(U202)
(TP3,TP4,TP5)
A condition is good?
YES
Check Input & output
signal at MUIC
A condition is good?
YES
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NO
Replace CN205
NO
Replace U202
NO
Replace U102