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LG CM9540 [53/85] Electrical troubleshooting guide
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3-32
ELECTRICAL TROUBLESHOOTING GUIDE
A
YES
YES
YES
POT. IN
Check MIC board.
Replace IC202.
Check IC501.
NO
NO
NO
IC202
Pin21,22 POT. IN input signal
OK?
IC202 Pin41
ADC/MIC_data output signal
OK?
IC202
Pin42,43,44 I2S input signal
OK?
TUNER
Check IC501.
Replace IC202.
Check +3.3 V of TU500.
IC202
Pin42,43,44 I2S input
signal OK?
IC202
Pin41 ADC data output
signal OK?
NO
NO
NO
TU500
TUNER_L/R output
signal OK?
YES
A
IC202
Pin23,24 TUNER_L/R input
signal OK?
NO
YES
YES
YES
Содержание
291- Service manual
- Cm9540
- Mini hi fi system
- Contents
- Section 1
- Contents
- Specification
- Servicing precaution
- Service information for eepro
- Program download update guid
- Hidden key mod
- Esd precaution
- Summary
- Repair notes
- Servicing precautions
- Notes regarding handling of the pick up
- Notes for transport and storage
- Notes for repair
- Preparations
- Notes regarding compact disc player repairs
- Esd precautions
- Electrostatically sensitive devices esd
- Caution graphic symbols
- Bluetooth dut
- Amp clip on off
- Edit eeprom
- Disc lock on off cd function only active
- Clear eeprom
- Check version and option code
- Push both front key and rcu key to activate it for 5 seconds
- Power disc lock on off cd function only active
- Hidden key mode
- Power on
- Service information for eeprom
- Remote control front stop push same timing during 5 seconds
- Remote control front stop push same timing
- Press stop key
- Move to appropriate position and make changes with remote control repeat
- Fld write ok
- Fld op0
- Fld no disc status
- Fld e2p clr
- Completed
- Program download update guide
- On vfd display screen
- Audio program
- On vfd display screen
- Cd program
- On vfd display screen
- Demo program
- On vfd display screen
- Eq program
- Specifications
- Section 2
- Exploded view
- Contents
- Cabinet main chassis
- Exploded views
- Cabinet and main frame section cm9540
- Mechanism deck section dp17tm2
- Packing accessory section
- Speaker section
- Left speaker
- 1 front speaker cms9540f
- Right speaker
- Front speaker cms9540f
- 2 subwoofer speaker cms9540w
- Section 3
- Electrical
- Contents
- No power
- 1 fuse bridge diode thermistor
- 1 2 how to troubleshoot countermeasure
- If the unit doesn t work by no power problem repair the set according to the following guide
- 1 3 service hint any picture remark
- 1 1 solution
- One point repair guide
- 2 no amp power
- One point repair guide
- No power
- If the unit doesn t work by no pvdd problem repair the set according to the following
- 1 micom ic501
- The set doesn t work when press the power button on the front board or the remote control
- One point repair guide
- No booting when power on the set
- 1 3 service hint any picture remark
- 1 2 how to troubleshoot countermeasure
- 1 1 solution
- 1 vfd dig300
- 1 3 service hint any picture remark
- 1 2 how to troubleshoot countermeasure
- 1 1 solution
- When power on the set any icons or characters on vfd are not displayed
- Vfd is not displayed when power on the set
- One point repair guide
- One point repair guide
- No booting in cd usb function
- One point repair guide
- No booting in cd usb function
- Cd or usb on vfd it will not display other message on vfd and it will not boot up normally
- 2 crystal x500
- 2 3 service hint any picture remark
- 2 2 how to troubleshoot countermeasure
- 2 1 solution
- 3 3 service hint any picture remark
- 3 2 how to troubleshoot countermeasure
- 3 1 solution
- One point repair guide
- No booting in cd usb function
- Cd or usb on vfd it will not display other message on vfd and it will not boot up normally
- 3 serial flash ic503
- 4 3 service hint any picture remark
- 4 1 solution
- One point repair guide
- No booting in cd usb function
- Cd or usb on vfd it will not display other message on vfd and it will not boot up normally
- 4 sdram ic502
- 4 2 how to troubleshoot countermeasure
- One point repair guide
- No booting in cd usb function
- Cd or usb on vfd it will not display other message on vfd and it will not boot up normally
- 5 dsp ic ic501
- 1 spindle motor
- When no sound output in the cd function you can not listen to music reading data from a cd disc if the servo motors in md don t work this step is for checking the spindle motor among them
- One point repair guide
- No operation of md driving the servo motors
- When no sound output in the cd function you can not listen to music reading data from a cd disc if the servo motors in md don t work this step is for checking the sled motor among them
- One point repair guide
- No operation of md driving the servo motors
- 2 sled motor
- One point repair guide
- No operation of md driving the servo motors
- When no sound output in the cd function you can not listen to music reading data from a cd disc if the pickup module in md doesn t work this step is for checking the laser tracking actuator
- One point repair guide
- No operation of md driving the servo motors
- 5 1 solution
- 4 laser tracking actuator
- 4 3 service hint any picture remark
- 4 2 how to troubleshoot countermeasure
- When no sound output in the cd function you can not listen to music reading data from a cd disc if the pickup module in md doesn t work this step is for checking the laser focusing actuator
- One point repair guide
- No operation of md driving the servo motors
- 5 laser focusing actuator
- 5 3 service hint any picture remark
- 5 2 how to troubleshoot countermeasure
- 5 1 solution
- No sound
- There is no sound output in the usb function repair the set according to the following
- One point repair guide
- 1 in the usb function
- No sound
- 2 in the aux function
- 2 3 service hint any picture remark
- 2 2 how to troubleshoot countermeasure
- 2 1 solution
- There is no sound output in the aux function repair the set according to the fol lowing guide
- One point repair guide
- There is no sound output in the port in function repair the set according to the following guide
- One point repair guide
- No sound
- 3 in the port in function
- 3 3 service hint any picture remark
- 3 2 how to troubleshoot countermeasure
- 3 1 solution
- There is no sound output in the tuner function repair the set according to the following guide
- One point repair guide
- No sound
- 4 in the tuner function
- 4 3 service hint any picture remark
- 4 2 how to troubleshoot countermeasure
- 4 1 solution
- There is no sound output in the mic in function repair the set according to the following guide
- One point repair guide
- No sound
- 5 in the mic in function
- 5 3 service hint any picture remark
- 5 2 how to troubleshoot countermeasure
- 5 1 solution
- There is no sound output in the bluetooth function repair the set according to the following guide
- One point repair guide
- No sound
- 6 in the bluetooth function
- 6 3 service hint any picture remark
- 6 2 how to troubleshoot countermeasure
- 6 1 solution
- 1 2 how to troubleshoot countermeasure
- 1 1 solution
- One point repair guide
- Audio signal output is small or not when you power on the middle power mini system
- Audio output is small or no audio output
- 1 ic700 ic705
- 1 3 service hint any picture remark
- No power on standby led is blinking
- One point repair guide
- It doesn t turn on and blinks standby led red
- 1 amp fets
- 1 3 service hint any picture remark
- 1 2 how to troubleshoot countermeasure
- 1 1 solution
- Speaker no audio
- 1 amp ic
- 1 3 service hint any picture remark
- 1 2 how to troubleshoot countermeasure
- 1 1 solution
- One point repair guide
- Power supply on smps board
- Electrical troubleshooting guide
- Electrical troubleshooting guide
- Electrical troubleshooting guide
- Electrical troubleshooting guide
- System part
- Electrical troubleshooting guide
- No audio part
- Electrical troubleshooting guide
- Electrical troubleshooting guide
- Electrical troubleshooting guide
- Electrical troubleshooting guide
- Electrical troubleshooting guide
- Electrical troubleshooting guide
- No lighting woofer speaker
- Waveforms of major check point
- Waveform of servo
- Figure 1 1 cd 16m ic407 pin31 figure 1 2 servo fe te fod rf ic407 pin61 62 63 ic408 pin1
- Waveform of motor drive
- Waveform of audio signal
- Waveform of adc 5 waveform of usb
- Waveform of vfd grid current driver
- Waveform of crystal 7
- Wiring diagram
- P 1 5mm
- Mic portable
- Block diagrams
- Front 385w x 2 surr 385w x 2 woofer 385w x 2
- Vfd dig301
- Dac ic az4580
- Tas5548 pwm
- Cs5346
- S4308 mic
- Am5890 motor drive
- Portable
- Mlc3730 mcs logic
- Micom r5f100geafb
- Mbyte serial flash
- Mbit sdram
- Main system block diagram
- Lc78615erf servo
- Ir receiver
- Fet irf6775 x 12ea
- Eeprom
- Driver irs2092 x 4ea
- Volume key
- Deck mechanism
- Main power block diagram
- Smps power 1 circuit diagram
- Circuit diagrams
- 49 3 50
- Smps power 2 circuit diagram
- 51 3 52
- Main cd dsp circuit diagram
- 53 3 54
- Main rf servo circuit diagram
- 55 3 56
- Main adc pwm circuit diagram
- 57 3 58
- Main amp circuit diagram
- 59 3 60
- 61 3 62
- Front volume circuit diagram
- Mic portable circuit diagram
- 63 3 64
- Front speaker main circuit diagram
- 65 3 66
- 67 3 68
- Front speaker sub circuit diagram
- Woofer speaker main circuit diagram
- 69 3 70
- Woofer speaker sub circuit diagram
- 71 3 72
- Connectors 2 capacitors
- Circuit voltage chart
- 73 3 74
- Smps p c board
- Printed circuit board diagrams
- Top view
- Top view
- Main p c board
- Bottom view
- Main p c board
- Front volume p c board
- Woofer speaker sub p c board
- Woofer speaker main p c board
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