LG GB160 Service Manual page 69

1.11.3 Checking Flow
Turn On the sound
Check the voltage level
of C539 = VBAT ?
Check the signal of
L507 & L503
Check the Level of
R522 = Low ?
Check the Audio PA
Check the ZIF connector
Check the LCM&SPK FPC
Check the Contact of
Try again or Change PCB
Start
YES
YES
YES
U502
YES
YES
YES
Speaker
NO
Check the Battery
NO
Check U200(MTK6223D)
NO
Check U200(MTK6223D)
NO
Re-solder
U502
NO
Re-solder
NO
Replace
NO
Re-assemble or replace
Speaker
69
ZIF connector
FPC