CM9750

LG CM9750 Service Manual

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3-2

ONE POINT REPAIR GUIDE

1. NO POWER

If the unit doesn’t work by no power problem, repair the set according to the following guide.

1-1. FUSE/ BRIDGE DIODE/ FET

1-1-1. Solution

Please check and replace F901, BD901, BD902, Q902~Q905 on SMPS board.

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

1) Check if the fuse F901 is open or short-circuit.

2) Check if the bridge diode BD901 or BD902 is short-circuit by over current with a digital multimeter.

3) Check if the FET Q902 ~ Q905 is normal or short.

 If it is short condition, it’s destroyed. Replace it with a new one.

(Please replace 4 FET at the same time although several FET is OK)

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

< F901 >

If F901 is not short-circuit,

replace it with a same

speciﬁ cations one.

< Q902 ~ Q905 >

If Q902 ~Q905 is short (pin1-3),

replace it with a new one.

<BD901, BD902 >

If BD901, BD902 is short-circuit,

replace it with a new one.

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General

Type	-
Cassette deck	No
Product color	Black
Number of decks	1 deck(s)
Disc loading type	Tray
Optical disc player	Yes
Number of optical discs	1 discs
Speaker type	3-way
RMS rated power	- W
Woofer diameter	304.8 mm
Tweeter diameter	25.4 mm
Number of speakers	2
Mid-range driver diameter	165.1 mm
Subwoofer driver diameter (imperial)	12 \
Tuner type	Digital
FM band range	87.5 - 108 MHz
Supported radio bands	FM
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.
Microphone connectivity	6.3 mm
Apple docking compatibility	Not supported
Disc types supported	CD, CD-R, CD-RW
Playback disc formats	CD audio
Audio formats supported	MP3, WMA
Volume control	Rotary
Equalizer modes	Bass, Classic, Jazz, Pop, Rock
Power source	AC