Speaker Trouble - LG G7100 Service Manual

4. TROUBLE SHOOTING

4.8 Speaker Trouble

SETTING : Connect PIF to the phone, and Power on. Enter the engineering mode, and set
"Melodyon" at Buzzer of BB test menu.
START
Check the
C201,C211. Are these
voltage = 2.8V?
Yes
Check the signal
level C208, C209
Yes
Check the
signal level Pin 6 and
Pin 10 at U201
Yes
Check the soldering Speaker
Yes
Speaker Working
Checking Flow
No
Check the soldering
of U203
Yes
Resoldering U203
No
Check the
No
soldering C208,C209,R200,
R201, R202,R203
Yes
Resoldering C208,C209,
R200,R201, R202,R203
No
- 82 -
No
Replace the U203
Replace the U200
No
Replace the U201
Replace Speaker