LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 105 -
4.15 Audio Receiver Path
MSM6275 EAR1ON/EAR1OP
→
CN602
→
CN1
→
Receiver
Start
The sine wave appears at
PIN33,PIN34,CN602
Change the Main board
YES
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
NO
The sine wave appears at
PIN33,PIN34, CN1?
Check LCD FPCB.
Check main/upper connector.
YES
NO
Can you hear the tone?
Change receiver
YES
NO
END
Summary of Contents for TU550
Page 1: ...Date May 2007 Issue 1 0 Service Manual Model TU550 Service Manual TU550 Internal Use Only ...
Page 185: ...Note ...
Page 186: ...Note ...