Headset Path - LG L705i Service Manual

4. TROUBLE SHOOTING

4.15 Headset path

MSM6280 HPH_R, HPH_L → C503/C504 → CON500 (Ear jack)
Connect the phone to network
equipment and setup call.
Setup 1KHz tone out
and insert headset.
Can you hear the tone?
Sine wave appears
Re-solder C503/C504
Change the Main board
C503
HPH_R
HPH_L
C504
C504
LGE Internal Use Only
Start
NO
at C503/C504 ?
NO
or
VREG_MSMP_2.7V
MIC2P
C503
EAR_SENSE_N
33u
STEREO_DET_N
33u VREG_MSMP_2.7V
HOOK_SENSE_N
- 112 -
YES
END
YES
Change the headset
Ear jack
R500 R501 R502
100K 100K 100K
R503 2.2K
C501 0.1u
R505 51
R506 51
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CN500
HSEJ-10S-05
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