Only For Training And Service Purposes - LG GT500 Service Manual

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

Only for training and service purposes