LG XC102 Service Manual page 51

1-8. READING OK CHECK #E (= "NO DISC" DISPLAY)
E
Does
TA+ waveform
appear at (IC802 PIN17
and PN801 PIN14)
waveform #5 tracking
coil drive
wave
YES
Check PN802
connector line
YES
Does
ARF signal appear?
(IC801 PIN 2)
waveform #6
YES
Does FE, TE signal
appear? (IC801
PIN10 : RFMON, PIN16 : TE)
waveform #6
* REMON is FE
Does
tain - waveform
NO
appear at (IC802 PIN22)
waveform #5
tracking drive
wave
Defective IC802
NO
Defective PN802 connector
NO
Defective pick up or IC801
NO
Defective pick up or IC801
4-8
NO
YES
Defective IC801