Receiver Trouble - LG CE500 Service Manual

4. TROUBLE SHOOTING

4.4 Receiver Trouble

• Check Points
- Audio signals from ABB
- Audio signals to the receiver
- Audio signal path(R219, R227)
- Check the sound level to the speaker.
- Soldering of connector & speaker/receiver
- Speaker/Receiver
RECEIVER and HEADSET
From ABB
HEADSET_SPK_R
MIX_EN
SPK_EN
RCV_P
R228 R225
100K 100K
Test Point
R219 : RCV_N
Check Audio signal here !
RCV_N and RCV_P
U204 FSA2267L10X
R223 22 C223 0.022u R224
2A 2B1
6 4
2S 2B0
7 3
C224 0.022u R226
1S 1B1
R227 0 8 2
1A 1B0
9 1
2V8_VMEM
C251
0.01u
R227 : RCV_P
- 42 -
R219
RCV_N
0
0
EAR_HEADSET
0
EAR_SPK
HEADSET_SPK_L
C221
10p
Vibrator &
Receiver
Soldering Check
EAR_N
Receiver Path
EAR_P
C218 C217
10p 10p
HEADSET_R
R222
HEADSET_L
22
C222
10p