LG-ID3100
LGE
LG Electronics Inc.
Earphone receiving path problem
2
Signwave appear
at TP6 and TP7 of U311
Signwave appear
at TP8 and TP9?
Yes
Yes
No
No
Earphone sending path problem
3
Level of TP2 at CON301
is more than 2.0V
Level of TP5(C279) is
About a few tens
or hundreds mVAC?
Re-solder
TP3, TP4
Re-solder
TP5(C279)
Does it work well?
Re-download
software
Does it work well?
4
Replace QSC
No
No
Yes
Yes
Yes
Yes
No
No
Change main board
Check the condition of U311
If problem, replace the U311
Level of TP10 and 11
of U311 is Low?
(High: FM Mode)
Yes
No
Re-download S/W
Signwave appear at
TP12 and 13 of CON301?
Check the receiving path from U311 to CON301
4
Yes
No
42/57
LGE Internal Use Only