LG CM9750 Service Manual

81 pages

To Next Page

To Previous Page

3-10

ONE POINT REPAIR GUIDE

NO BOOTING IN CD/USB FUNCTION

After you turn on power key and displayed message in the following order (HELLO  VOL XX 

CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.

8-2. CRYSTAL (X500)

8-2-1. Solution

Replace X500 on MAIN board.

8-2-2. How to troubleshoot (Countermeasure)

1) If 3.3 V & 1.2 V is normal, Check the CHIP_RESET of IC501 pin T12 on MAIN board.

 If CHIP_RESET isn’t high, Check MICOM(IC101) pin40.

2) If CHIP_RESET is high, Check the soldering status of 24 MHz crystal (X500).

3) If the crystal (X500) doesn’t oscillate, Check R508, R509, C502, C503 around crystal (X500).

 If there’s no defective component, then replace X500.

8-2-3. Service hint (Any picture / Remark)

X500

< Signal waveform >

< MAIN board top view >

IC501

X500

Other manuals for LG CM9750

Need help?

Do you have a question about the LG CM9750 and is the answer not in the manual?

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