LG CK57 Service Manual page 47

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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 FOCUSING ACTUATOR.

4-5. LASER FOCUSING ACTUATOR

4-5-1. Solution

Please check and replace IC400, IC401 on MAIN board.

4-5-2. How to troubleshoot (Countermeasure)

The focusing actuator makes the laser beam keep a regular interval with the surface of a CD disc.

1) Check the FDO signal from Pin13 of IC401.

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

2) Check F- & F+ from IC400 to CN400 for driving the focusing actuator.

 If no signal, check M_5V for IC401.

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 top or bottom side.

Please check the function after changing another MD.

4-5-3. Service hint (Any picture / Remark)

< Waveform of F±

for driving FOCUSING actuator >

ONE POINT REPAIR GUIDE

F- : pin13 to CN401(pin18)

F+ : pin14 to CN400 (pin15)

< MAIN

board top

< MAIN board bottom view >

view >

3-10

IC400

Only for training and service purposes.

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