LG CED-8042B Manual page 51

Spindle Motor operating
is abnormal.
Does P/U move
outside one more time
in the beginning?
NO
Is there spindle
drive voltage output?
(IC551 pin 4)
NO
IS there Spindle
drive voltage output?
(IC556 pin 7)
YES
Is IC555 pin 5 (DMCON) "H"?
YES
Is there Spindle
drive voltage output?
(IC552 pin 1)
YES
Check the cold soldering for the area of
IC552 (NJM3403AV), IC503 (BU4053)
(Check the short of Register and capacitor)
Is there the cold soldering?
YES
Check operation after repairing
the cold soldering.
58
YES
Go to "RFDC OUTPUT is abnormal"
Is there Spindle
YES
drive voltage output?
(IC551 pin 2, 27, 28)
YES
Check the connection of Spindle
connector and the open of FFC.
If it's OK, replace spindle motor.
NO
Is there MPWM signal ouput?
(IC209 RL5E808 pin 8)
YES
Check the peripheral circuit of
IC556 (NJM2100M).
If it's OK, replace IC556
NO
NO
Replace IC555 (TC4W53FU)
NO
Replace IC552 (NJM3403AV).
NO
Is IC551 pin 11 "H"?
NO
Replace Spindle Drive IC
IC551 (LB11995)
If IC204 (74VHC374) is normal,
replace IC202 (MICOM)
NO
Check the operation and the
cold soldering for the IC209.
(RL5E808)
A
Go to <Picture 1>
YES