Laser Operating Is Abnormal - LG BD390 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

7. LASER OPERATING IS ABNORMAL

7-1. BD-ROM
BD-ROM operating is abnormal
Is there
TR LQ122 collector voltage input?
(about 4.86V, 25° C)
NO
Is there
TR LQ122 base voltage input?
(about 8.0V)
NO
Is there
TR LQ112 base voltage input?
(about 1.33V)
NO
Check the LIC501 PIN124 output.
YES
Replace the traverse assembly
and scan the pick-up barcode.
Check the main PCB pick-up
interface circuit.
YES
Check the TR LQ122 and
VCC for BD LD (about 9.2V)
YES
Check the TR LQ112 and
VCC for BD LD (about 9.2V)
4-8
NG