LG Electronics LG-C320 service manual TP1C506, C507?, Change the IC501

4. TROUBLE SHOOTING

4.11 Headset path

QSC6270(3G disable) HPH_OUT_L_P/N Æ TP1_C506,C507 Æ IC501(Audio Sub System) Æ TP2_R504,R505 Æ TP3_FB504, FB505 Æ J501(=3.5pi Ear-jack)

START

Connect the phone to network

equipment and setup call.

Setup 1KHz tone out and insert headset.

Can you hear the tone?	Yes	END
No

Sine wave appears at	Yes
TP3_FB504, FB505
No

Re-solder or Change J501

Change the Main PCB

Sine wave appears at	Yes
TP2_R504, R505?
No

Re-solder the FB504, FB505

Change the Main PCB

Sine wave appears at	Yes
TP1_C506, C507?
No
Change the Main board

Change the IC501

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