LG BD370 - Laser Operating Is Abnormal

4-8
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Only for training and service purposes
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ELECTRICAL TROUBLESHOOTING GUIDE
Laser operating is abnormal
Replace the traverse
assembly. (Pick-up)
Is there
LDD data signal
communication? (LIC501
Pin44,45,46,
90)
OK
NO
NG
Does
laser turn on?
YES
NG
YES
Replace the LIC501.
Replace the traverse assembly
and scan the Pick-up barcode.
Is there
LDD vcc voltage input?
(LIC201 Pin32, 33)
NO
Pin32 : Check the 5V path.
Pin33 : Check the 8.1V path
and LIC902 operation
Check the main PCB Pick-up
interface circuit
Check the signal pattern and
application components
Check the LDD data signals.
(LCN700 Pin39,40,41,42)
Check the connector
LCN700 and Pick-up FFC
cable connection
NO
OK
YES
7. LASER OPERATING IS ABNORMAL