LG MCD112 Service Manual page 55

1-6. READING OK CHECK #C (= "NO DISC" DISPLAY)
C
Is ?V applied
to PIN10 of PN801
laser supply voltage
check
YES
Check PN801 connector line
YES
LGE Internal Use Only
Is 3.3V
applied to
NO
PIN30, 36, 39, 41, 61,
68, 75 of IC801 RF IC
supply voltage
check
Is 2.3V
PIN18 (LDO) of IC801
laser control voltage
check
Defective Q801 or D801
NO
Defective PN801 connector
Defective pick up laser part
4-6
NO
YES
NO
YES
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Defective IC804
Defective IC801
Only for training and service purposes