SETTING : “Melody on” at sounds of test menu.
Voltage across C447
Is over 3.4~4.2V
Check the soldering of PIN
6 of U402
Change Main Board
Internal Pattern is
opened
START
Re-soldering
Pin 6 of U402
Check the signal level of
PIN4 of U402
Check the soldering
C425, R430
Replace MSM
Check the soldering of
PIN 1 of U402
Check the Soldering of
R426
Re-soldering
Pin5,Pin8 of U402
Replace MSM
Check the signal level of
PIN5, PIN8 of U402
Check the Soldering of
R455, R457 & CON300
Re-soldering
R426
Check the state
Of contact of speaker
Speaker will work properly
Replace U402
Re-soldering
R455, R457 &
CON300
NO
NO
NO
NO
NO
NO
NO
NO
Yes
Yes
Yes
Yes
Yes
Yes
Checking Flow
Yes
Yes
Yes
Summary of Contents for LG-YD636
Page 1: ...CDMA MOBILE SUBSCRIBER UNIT LG YD636 SINGLE BAND CDMA MOBILE PHONE SERVICE MANUAL ...
Page 16: ...3 1 5 Checking Duplexer Mobile SW Test Point Circuit Diagram U100 1 DP100 8 DP100 5 ...
Page 18: ...DP100 Pin 8 DP100 Pin 5 Graph 3 3 b Graph 3 3 c ...
Page 28: ... PM6610 FUNCTIONAL BLOCK DIAGRAM3 3 3 3 Logic Part Trouble ...
Page 36: ...Circuit Diagram USB TRANSCEIVER USB RESONATOR ...
