Checking Flow
START
Does Speaker work Properly?
NO
The R423(SPK_EN) is High?
The Pin6 of U402 is
High : Speaker mode
Low : Receiver mode
SETTING : “Ringers” at Sounds menu
Check the contact of speaker or
Replace the speaker
Check the
soldering R423
Re-soldering R423
NO
NO
Yes
Yes
Check the signal
level at L406, 407
Check the signal
level at Pin4 of
U401
Does U401 work
properly?
Replace the MSM or Board
Re-soldering L406, L407
Replace the MSM
Check the signal
level of EAR10+ at
R422, R430
Re-soldering or
Replace the U402
Re-soldering or
Replace the U401
Speaker will work properly
Yes
Yes
Yes
Yes
NO
NO
NO
NO
Check the soldering
L406, L407
Yes
Yes
NO
Voltage at Pin6 of
U401 is over
3.4~4.2V?
NO
Change main board.
Internal pattern is opened
Yes
36
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Summary of Contents for LG-MC2670
Page 17: ...LG MC26 70 DCN Mode Graph 2 1 2 1763 04MHz DCN384 14 Z 3 X B O X C O M ...
Page 21: ...LG MC2670 Waveform DP101 Pin 5 Graph 2 1 4 c DP101 Pin 8 Graph 2 1 4 b 18 Z 3 X B O X C O M ...
Page 32: ...LG MC2670 Circuit Diagram 29 Z 3 X B O X C O M ...
Page 55: ...LG MC2670 Appendix Z 3 X B O X C O M ...
Page 56: ...Z 3 X B O X C O M ...
Page 58: ...Z 3 X B O X C O M TX Line RX Line Local Line RD2670 ...
Page 59: ...Z 3 X B O X C O M TX Line RX Line MIC Line SPK Line RD2670 ...
Page 60: ...Z 3 X B O X C O M RD2670 ...
Page 61: ...Z 3 X B O X C O M SPK Line MIC Line RD2670 ...
Page 65: ...Description LG Part No Q ty MAIN PCB SPFY0083001 1 2 PCB Z 3 X B O X C O M ...