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6. POWER AMP PART CHECK

POWER AMP PART CHECK

Refer to SMPS troubleshooting.

Check

CN105 Pin6: +12 V

Pin14,15: 26 V.

YES

Check IC701, IC702

Pin29, 30, 31, 36, 37, 38 input voltage.

YES

Check each line resistor output voltage.

Check IC701, IC702

Pin2: +12 V input.

Check IC701, IC702

Pin27, 28, 32, 35, 39, 40.

Replace the coil.

Check output

line coil.

Check PWM Modulator input

IC701 Pin5, 6, 14, 15 / IC702 Pin5, 6.

YES

3-24

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

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LG CM4330 Specifications

General

Karaoke	No
Bass reflex	Yes
Speaker type	4-way
RMS rated power	180 W
Number of speakers	2
Type	Home audio mini system
Product color	Black
Disc types supported	CD-R, CD-RW
Playback disc formats	CD audio
Audio formats supported	MP3, WMA
Supported radio bands	AM, FM
Display type	-
Apple docking compatibility	Not supported
USB 2.0 ports quantity	1
Power source	AC
Volume control	Rotary