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 L403, 404
Check the signal
level at Pin4 of
U401
Does U401 work
properly?
Replace the MSM or Board
Re-soldering L403, L404
Replace the MSM
Check the signal
level of EAR10+ at
R422, R428
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
L403, L404
Yes
Yes
NO
Voltage at Pin6 of
U401 is over
3.4~4.2V?
NO
Change main board.
Internal pattern is opened
Yes
Z3X-BOX.COM
Summary of Contents for ID2750
Page 33: ...DCN Mode Graph 4 2 1763 04MHz DCN384 Z 3 X B O X C O M ...
Page 37: ...Waveform DP101 Pin 7 Graph 4 3 c DP101 Pin2 Graph 4 4 c Z 3 X B O X C O M ...
Page 48: ...Circuit Diagram Z 3 X B O X C O M ...
Page 49: ...Figure 4 3 1 PMIC PM6610 FUNCTIONAL BLOCK DIAGRAM 4 3 Logic Part Trouble Z 3 X B O X C O M ...