CM9750

LG CM9750 Service Manual

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3-4

ONE POINT REPAIR GUIDE

3. NO BOOTING WHEN POWER ON THE SET

The set doesn’t work when press the power button on the FRONT_CTRL board or the remote control.

3-1. IC501

3-1-1. Solution

Replace IC501 on MAIN board.

3-1-2. How to troubleshoot (Countermeasure)

1) Check the 5.6 VA (CN106) and DVCC_3.3 V (IC505) in standby mode.

 If there is no 5.6 VA, check the SMPS and if doesn’t appear 3.3 V, check IC505.

2) Check 5.6 VA, +12 V, FL+, FL-, an +39 V when power on the set.

 If the set doesn’t work regardless of what the KEY2 changes high to low

while pressing the power button. X500 and X501 work normally but, if you can not power on the set,

replace the IC501 with a new one on the MAIN board.

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

< MAIN board top view >

< MAIN board bottom view >

X500

(24 MHz)

X501

(32.768 kHz)

KEY2

(R526)

R522

PWR_CTRL

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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