LG LM-M540 Service Manual page 10

CD
IC601 6,23 PIN signal input check
CN513 1,3 PIN signal check and refer to CD Troubleshooting
TUNER
IC601 4, 25 PIN signal input check
Refer TUNERMODULE
MIC
IC602 2PIN check
Refer to IC404 Troubleshooting
IC301 Troubleshooting
C301 17, 46, 72, 90 power applied check
IC301 26PIN 5V applied check
X301 oscilates or not
When IC301 11Pin voltage input. High©Low©High
IC301 replace
Refer to power supply check
P-SENS terminal check
X301 replacement
RESET circuit check
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