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3-6

Only for training and service purposes.

ONE POINT REPAIR GUIDE

4. 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 SPINDLE MOTOR among them.

4-1. SPINDLE MOTOR

4-1-1. Solution

Please check and replace IC400, IC401 on MAIN board.

4-1-2. How to troubleshoot (Countermeasure)

1) Check the SPDO signal from pin16 of IC401.

 If no signal, check 3.3 V(RF) and X400.

2) Check the SPIN- & SPIN+ from IC400 to CN401 for driving SPINDLE motor. It is about 3.6 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 spindle motor is sort-circuit or has any trouble, it can not rotate CD discs.

Please check the function after changing another MD.

4-1-3. Service hint (Any picture / Remark)

About 3.6 Vpp

< Waveform of SP- & SP+

for driving SPINDLE motor >

< MAIN

board top

view >

< MAIN board bottom view >

CN401

IC400

SP- : pin18 to CN401(pin8)

SP+ : pin17

to CN401(pin6)

LG CKS57F Service Manual

Other manuals for LG CKS57F