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Does SLED
move to inner
side when it is at
outer side?
YES
Do not put
disc and press
switch close?
YES
Optical
Lense is moving to
searching focus.
YES
Laser turn on
when reading
disc?
YES
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Only for training and service purposes
NO
Motor Drive
DRV_MUTE pin
is High?
YES
SLED signal
is OK?
YES
Check P401
connection to Pickup.
NO
Proper focus
outputs to motor
driver?
YES
Proper F+& F-
outputs?
YES
Check P400
connection to pickup.
NO
DVDLD or
CDLD output
properly?
YES
Pin collector
of Q405& Q406
is OK?
YES
Check P400 connec-
tion to pickup.
NO
Check Pickup.
NO
Check related circuit
of SLED and IC401.
Check focus
NO
connection on ES8380
and IC401.
NO
Check IC401.
Check laser power cir-
NO
cuit between ES8380
and Q405, Q406.
NO
Replace the F901.
(Use the same Fuse)
- 3-7 -
LGE Internal Use Only
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