LG MX8550 Service Manual page 102

MX8550
START
Check the DSP Trouble
YES
Check audio signal at C 519, C520
YES
Check the voltage at R 530,
R531, R532
YES
Check the clock signal at R 525
YES
Check the audio signal at CON 501
YES
Check the state of speaker contact
YES
Speaker will work properly
LG Electronics Inc.
Test point
Test point
R530
R532
R531
U516
U517
C520 C519
Checking Flow
Checking Flow
Check the soldering at
C519, C520
NO
Replace U303
NO
Check the voltage at
R533
NO
Check the soldering at
U516
NO
R525
R533
Replace MSM or Main B/D
NO
YES
NO
YES
Resolder U517 with heat gun
NO
YES
Resolder U516 with heat gun
Resolder C519. C520
Replace U303
Replace U516
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