LG GT500 - Page 103

- 104 -
LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
4.9.4. Headset Receiver (Voice call, Video Telephony,MP3 )
START
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Insert Headset.
Does the Headset icon
display on the main LCD?
Can you hear sine wave
out of the receiver ?
Change the main B’d
END
YES
YES
YES
NO
NO
NO
Does the level of R502
(TP1) under 0.5Volt ?
NO
Resolder R502(TP1)
And try
again from the start
YES
Does the sine wave appear
at R505(TP4),R506(TP5) ?
Resolder CN501 Pins
or change the Headset
1
5
7
Does the sine wave appear
at R339(TP2),R342(TP3) ?
4
YES
Change the U301
Change the main B,d
NO
Change the U501
Insert Headset.
Does the Headset icon
display on the main LCD?
YES
NO
2
`
3
Does the sine wave appear
at TP6, TP7 at CN501 ?
NO
Change the U501
6