LG F3000 - Page 82

4. TROUBLESHOOTING
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Check the signal level
of JACK_DETECT.
Is it almost 0?
Earphone detect problem
1
4
Replace U201
Resolder U202.
Level of R201 is
about 2.5V?
5
5
No
No
Yes
Yes
Earphone sending
path problem
3
Level of R210 is
about 2.8V?
Re-solder
R210
Level of R230 is
about a few tens
or hundreds VAC?
Does it work well?
Yes
Re-download
software.
Does it work well?
Change
main board
4
No
Yes
Re-solder
R230
No
Earphone detect problem
Earphone sending path problem