LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 109 -
4.17 Speaker phone path
MSM6275 HPH_R, HPH_L
→
Filter block (SPK_R: R202/C210/C211/R203/R204/C212, SPK_L:
R206/C214/C215/R207/R208/C216)
→
Audio AMP(SPK_R:U507, SPK_L:U506)
→
SPK_R:SPK_RP,SPK_LP , SPK_L:SPK_LP,SPK_LN (connector)
→
Speaker
Start
Sine wave appears at
R202 , R206 ?
Change the Main board
NO
Connect the phone to network
equipment and setup call
Setup 1KHz tone out
Sine wave appears at
C211/R203 and C215/R207?
YES
Check C211/R203 and C215/R207 or
Change the Main board
NO
SPK_AMP_EN(C288) is
2.6V?
Change the Main board
NO
YES
Sine wave appears at
Pin21,22,23,24 of CN602?
NO
YES
YES
Soldering speaker OK?
Re-solder speaker
NO
Can you hear the tone?
Change the speaker
NO
YES
END
YES
Change the Main board
Sine wave appears at
SPK_LP,SPK_LN and SPK_RP,SPK_RN
of LCD-FPCB
Change the LCD-FPCB
NO
YES
Содержание TU550
Страница 1: ...Date May 2007 Issue 1 0 Service Manual Model TU550 Service Manual TU550 Internal Use Only ...
Страница 151: ... 152 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 161: ... 162 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...
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