LG CM9730 Service Manual

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3-23

ONE POINT REPAIR GUIDE

7. AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT

Audio signal output is small or not. when you power on the Middle Power Mini

System.

7-1. IC700 ~ IC706 & IC708

7-1-1. Solution

Please check and replace IC700 ~ IC706 & IC708 on MAIN board.

7-1-2. How to troubleshoot (Countermeasure)

1) Please check if this system is on bass blast mode.

 C, RL and RR make sound only on bass blast mode.

2) Check the IC700 ~ IC706 & IC708 on your eyes.

3) Check the audio signal output check (Pin13 of IC700 ~ IC706 & IC708).

First, check the PWM Data input (Pin3 pin of IC700 ~ IC706 & IC708).

4) If the audio signal output has no output, try to change IC which has no output.

5) Lastly, check Speaker Terminal (CN702, CN703).

7-1-3. Service hint (Any picture / Remark)

< MAIN board top view >

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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.