LG CM9730 Service Manual

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3-24

ONE POINT REPAIR GUIDE

8. NO POWER ON (STANDBY LED IS BLINKING)

It doesn’t turn on, and blinks standby LED(Red).

8-1. AMP FETs

8-1-1. Solution

Please check and replace Q700 ~ Q705, Q708, Q709, Q714, Q716, Q719 ~ Q724 on MAIN board.

8-1-2. How to troubleshoot (Countermeasure)

1) This symptom occurs, when DC protection is detected. Main reasons are like below.

- When Some of AMP FETs dead.

8-1-3. Service hint (Any picture / Remark)

AMP FET : IRF6775

Notice for FET service

- In case of RF6775, Metal case, FET Drain,

has electric potential. So be careful when you

deal with it.

* You can see FET after removing heatsink.

* Notice for Service

Before repair Main Assy, you need to discharge SMPS.

After then, open the connector.

You should try to change both of +/- FET and Driver IC as a pair.

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General

Type	-
Cassette deck	No
Product color	Black
Disc loading type	Tray
Optical disc player	Yes
Impedance	75 Ω
RMS rated power	2300 W
Number of speakers	2
Power source	AC
Input voltage	220-230 V
Input frequency	50 - 60 Hz
Power consumption (standby)	1 W
Power consumption (typical)	180 W
Playback disc formats	CD audio
Audio formats supported	MP3, WMA
FM band range	87.5 - 108 MHz
Supported radio bands	AM, FM, MW
Preset stations quantity	50
Display type	LCD
Speaker depth	500 mm
Speaker width	520 mm
Speaker height	720 mm
Apple docking compatibility	Not supported
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.