LG KU580 Service Manual - Page 103
Is the level of MIC+ AND MIC
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4. TROUBLE SHOOTING START Check the MIC bias level at the pad of MIC Is the level of MIC+ AND MIC- 1 2.4Volt ? Yes Change the MIC Yes 2 No Check the signal level at C623 at the putting Audio signal in MIC Yes A few hundred of mV of the signal measured ? 3 No Yes Change the main B,d Resolder 623.625 and try again. If fail again, chage the main Bíd No Does it work properly ? YES END LGE Internal Use Only - 104 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes
- 104 -
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
START
Is the level of MIC+ AND MIC-
2.4Volt ?
Change the MIC
Check the signal level
at C623 at the putting
Audio signal in MIC
Does it work properly ?
END
Yes
Yes
YES
No
A few hundred of mV
of
the signal measured ?
Change the main B,d
Check the MIC bias level
at the pad of MIC
Resolder 623.625
and try again.
If fail again,
chage the main Bíd
3
2
1
No
Yes
Yes
No