LG -ID3100 Service Manual page 44

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