LG -A290 Service Manual page 87

START
< Cal l >
Resolder TP1
Check the
TP1(JACK
DETECT) is
HIGH?
Yes
Yes Can you hear
the sound from
the earphone?
No
Check the
Audio signal
HS_OUT_L/R
(TP4)?
Yes
3.5 φ Headset
Speaker working well
LGE Internal Use Only
No
Resolder Q00
3.5 φ Headset
MIC Trouble?
No
No
Resolder or Replace
U101
Check the
Audio signal
HS_OUT_L/R
(TP4)?
3.5 φ Headset
Speaker working well
- 87 -
4. TROUBLE SHOOTING
YES
No
Resolder or Replace
U03
Yes
Yes
Copyright © 01 LG Electronics. Inc. All right reserved.
Hook detect
Trouble?
YES
Check the Low detect
at VA05?
No
Resolder or Replace
FB07
3.5 φ Headset
Hook working well
Only for training and service purposes