LG MCV902 Service Manual page 56

1-4. READING OK CHECK #A (= "NO DISC" DISPLAY)
A
DOES
SL+ WAVEFORM
APPEAR AT (IC802
PIN13 AND PN802
PIN3) WAVEFORM #2
SLED MOTOR
WAVE
YES
CHECK PN802
CONNECTOR LINE
YES
DEFECTIVE PICKUP
SLED MOTOR
1-5. READING OK CHECK #B (= "NO DISC" DISPLAY)
B
DOES
FA+ WAVEFORM
APPEAR AT (IC802 PIN16
AND PN801 PIN13)
WAVEFORM #3 FOCUS
COIL DRIVE
WAVE
YES
CHECK PN801
CONNECTO LINE
YES
DEFECTIVE PICKUP
FOCUS ACTUATOR
DOES SLIN
NO
WAVEFORM APPEAR AT
(IC802 PIN5) WAVEFORM
#2 SLED DRIVE
WAVE
DEFECTIVE IC802
NO
DEFECTIVE PN802
CONNECTOR
DOES
FAIN-WAVEFORM
NO
APPEAR AT (IC802 PIN25)
WAVEFORM #3
FOCUS DRIVE
WAVE
DEFECTIVE IC802
NO
DEFECTIVE PN801
CONNECTOR
4-5
NO
NO
NO
NO
DEFECTIVE IC801
DEFECTIVE IC801