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LG CM9730 Service Manual

LG CM9730
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3-30
ELECTRICAL TROUBLESHOOTING GUIDE
2. SYSTEM PART
Power on.
FRONT board OK.
Check 17p FFC cable.
Check SMPS board.
Check FFC cable.
Check MAIN board.
Check SMPS board.
Check MAIN board.
Replace DIG301.Q301, 303, 304 grid voltage OK?
Replace LED
(LD3V09 ~ LD3V24).
Check MAIN board.
“HELLO”
Display on FLD
OK?
Volume LED
(LD3V31 ~ LD3V40
LD3V42 ~ LD3V49)
Turn on?
When turn
the volume, count is
change?
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
CN301
cable connection
OK?
Q301,
Q303, Q304 grid voltage
OK?
CN3V01
Pin31, 32 signal
OK?
CN301
Pin9, 10, 11 data signal
OK?
CN301 pin1, 3, 5
power OK?
CN3V01
Pin8, 9 +12 V OK?
YES
YES
YES
YES
YES
YES
YES
YES
YES

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LG CM9730 Specifications

General IconGeneral
Type-
Cassette deckNo
Product colorBlack
Disc loading typeTray
Optical disc playerYes
Impedance75 Ω
RMS rated power2300 W
Number of speakers2
Power sourceAC
Input voltage220-230 V
Input frequency50 - 60 Hz
Power consumption (standby)1 W
Power consumption (typical)180 W
Playback disc formatsCD audio
Audio formats supportedMP3, WMA
FM band range87.5 - 108 MHz
Supported radio bandsAM, FM, MW
Preset stations quantity50
Display typeLCD
Speaker depth500 mm
Speaker width520 mm
Speaker height720 mm
Apple docking compatibilityNot supported
USB 2.0 ports quantityUSB 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.
Weight and Dimensions IconWeight and Dimensions
Main unit dimensions (WxDxH)542 x 421 x 310 mm

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