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3-7

Only for training and service purposes.

ONE POINT REPAIR GUIDE

< MAIN

board top

view >

< MAIN board bottom view >

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if

the servo motors in MD don’t work. This step is for checking the SLED MOTOR among them.

4-2. SLED MOTOR

4-2-1. Solution

Please check and replace IC400, IC401 on MAIN board.

4-2-2. How to troubleshoot (Countermeasure)

1) Check the SLDO signal from Pin15 of IC401.

 If no signal, check DVCC_3.3V and X400.

2) Check the SLED+ & SLED- from IC400 to CN401 for driving SPINDLE motor. It is about 2.9 Vp-p.

 If no signal, check VDD_CORE and DVCC_3.3V for IC401.

3) Check if the FFC cable is solidly connected between CN401 and MD.

4) Check the MD.

 If the sled motor is sort-circuit or has any trouble, it can not move the pickup module.

Please check the function after changing another MD.

4-2-3. Service hint (Any picture / Remark)

SL- TO CN401

SL+ TO CN401

< Waveform of SLED- & SLED+

for driving SLED motor >

CN401

IC400

SLED- : pin18

to CN401(pin9)

SLED+ : pin17

to CN401(pin7)

LG CKS57F Service Manual

Other manuals for LG CKS57F