LG RH4820W Service Manual page 67

Recognition Fail Case 2:DVD Fail
Check pick-up read power
was 0.9~1.1mW?
YES
Is IC302
pin 46(LDEN-DVD)level
was about 3.3V?
YES
Is there
RF signal at CN101
pin 13,14.
YES
Is there RF signal
at IC107 pin 99.
YES
Check again after the
replace IC107.Is it OK?
YES
OK
Recognition Fail Case 3:
DVD±R/RW Fail
Is there WOBBLE
(IC107 pin 75)signal?
Replace the IC107.
NO
Go to "LD CHECK".
NO
Replace the IC302.
NO
Replace the pick-up.
NO
Replace the IC107
NO
Replace the IC202.
NO
Is there WBLLPP
(IC202 pin 133)signal?
Replace the IC202.
Check the connection between
IC107 and IC202.
3-87
NO
YES