LG M6100 Service Manual - Page 91

SETTING : After initialize Agilent 8960, Test EGSM, DCS, PCS mode

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4. TROUBLE SHOOTING Checking Flow SETTING : After initialize Agilent 8960, Test EGSM, DCS, PCS mode Set the property of audio as PRBS or continuous wave. Set the receiving volume of mobile as Max. START Check the signal level of No RCV_P & RCV_N at R114, R116. Are these levels about 1.2V? Yes Check again Check the soldering R114 & R116 Yes Re-soldering R114, R116 No Replace the Main board. ABB is out of order. Check the signal level of SPK_RCV_SEL. Is it almost 0? Yes No Check again Replace U204 Check the contact state of dual mode speaker. Yes The dual mode speaker will work properly. No Replace the dual mode speaker - 92 -

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4. TROUBLE SHOOTING
- 92 -
SETTING : After initialize Agilent 8960, Test EGSM, DCS, PCS mode
Set the property of audio as PRBS or continuous wave.
Set the receiving volume of mobile as Max.
Replace the Main board.
ABB is out of order.
START
Check the signal level of
RCV_P & RCV_N at R114, R116.
Are these levels about 1.2V?
Check the signal level of
SPK_RCV_SEL.
Is it almost 0?
Yes
No
No
Yes
Check the contact state of dual
mode speaker.
Replace the dual mode speaker
The dual mode speaker
will work
properly.
No
Check the soldering
R114 & R116
No
Yes
Re-soldering
R114, R116
Replace U204
Check again
Check again
Yes
Checking Flow