LG CM8460 User Manual

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3-8

ONE POINT REPAIR GUIDE

7. SPEAKER NO AUDIO

Speaker no audio.

7-1. AMP IC (IC700, IC701, IC705)

7-1-1. Solution

Replace IC700, IC701, IC705 on MAIN board.

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

1) Check supply voltage of AMP (CN110) & PWM signal.

Normal supply voltage and signal  Check AMP IC.

Poor supply voltage  Check SMPS.

Poor signal  Check PWM IC.

2) Check CSD of FET driver IC (IRS2092 : EAN60778301).

CSD has about 5 V on normal state.

When AMP has problem, CSD is LOW state or keep change LOW to HIGH.

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

< MAIN board top view >

< MAIN board top view > < MAIN - AMP circuit >

CN110

pin1, 2 : +66 V

pin3, 4 : PGND

pin5, 6 : -66 V

pin5 of IC700



CSD

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General

Type	Home audio mini system
Cassette deck	-
Product color	Black
Optical disc player	Yes
Number of optical discs	1 discs
RMS rated power	2750 W
Number of speakers	2
Number of subwoofers	1
Subwoofer driver diameter (imperial)	10 \
Power source	AC
Power consumption (standby)	0.5 W
Power consumption (typical)	250 W
Supported radio bands	FM
Audio formats supported	MP3, WMA
Headphone connectivity	3.5 mm
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.
Apple docking compatibility	Not supported

Weight and Dimensions