LG CK57 Service Manual page 46

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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 pickup module in MD doesn't work. This step is for checking the LASER TRACKING ACTUATOR.

4-4. LASER TRACKING ACTUATOR

4-4-1. Solution

Please check and replace IC400, IC401 on MAIN board.

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

The tracking actuator makes the laser beam be positioned in the center of a track on CD disc.

1) Check the TRD signal from Pin14 of IC401.

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

2) Check TR- & TR+ from IC400 to CN400 for driving the tracking actuator.

 If no signal, check M_5V and +5 V for IC400.

3) Check if the FFC cable is solidly connected between CN400 and MD.

4) Check the MD.

 If the pickup module has any trouble, it can not move the laser beam on the left or right side.

Please check the function after changing another MD.

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

< Waveform of TR±

for driving TRACKING actuator >

ONE POINT REPAIR GUIDE

TR+ : pin16 to CN400(pin16)

TR- : pin15 to CN401(pin17)

< MAIN

board top

< MAIN board bottom view >

view >

3-9

IC400

Only for training and service purposes.

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