LG FFH-286A Service Manual page 11

Fails to initial read
Disc motor turns
YES
Does RF waveform appear?
IC801 Pin3
YES
Check the Voltage change of PN 809
NO
PIN20(OPEN, CLOSE)
Check the Data transmission from
NO
PN809 pin11 to CD DSP
Check the Data transmission from
PN809 pin13 to MICOM
Check the change of SLDO
Voltage(IC801 pin23)
Check the change of SL +,
SL - Voltage
(IC802 pin 18, 19)
Does laser light?
YES
Does FA+ waveform appear at
IC802 pin13?
focus coil drive wareform.
YES
Does TE waveform appear at
801 pin 15?
TRACKING ERROR wareform
YES
Is rotation normal?
YES
Is there no dropout of RF signal?
- 2-4 -
YES
5V
0V
YES
5V
0V
YES
2V
1V
0V
YES
1.2V
0V
0.8V
YES
A
NO
NO
B
NO
YES
Defective connector
NO
PN809
Defective connector
NO
PN809, Defective
MICOM
Defective connector
PN809, Defective
NO
IC801
NO
Defective IC801
NO
Defective IC802
Defective contact PN802
Defective PICK-UP
Defective IC801
Defective PICK-UP