LG XC102 Service Manual page 48

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
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 connector line
YES
Does slin
waveform appear at
NO
(IC802 PIN5)
waveform #2
sled drive
wave
Defective IC802
NO
Defective PN802 connector
Defective pick up sled motor
Does
fain-waveform
NO
appear at (IC802 PIN25)
waveform #3
focus drive
wave
Defective IC802
NO
Defective PN801 connector
Defective pick up
focus actuator
4-5
NO
YES
NO
YES
Defective IC801
Defective IC801