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LG CM9540 — руководство по ремонту: отсутствие питания устройства [24/85]
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3-3
ONE POINT REPAIR GUIDE
NO POWER
If the unit doesn’t work by no ±PVDD problem, repair the set according to the following
guide.
1-2. NO AMP POWER
1-2-1. Solution
Please check and replace F911, Q905, Q906 on SMPS board.
1-2-2. How to troubleshoot (Countermeasure)
1) Check if the fuse F901 is open or short-circuit.
2) Check the Drain-Source or Drain-Gate, Gate-Source Resistance of Q905, Q906 with a digital multi-meter.
If it is short condition, it’s destroyed. Replace it with a new one.
(Please replace 2 FET at the same time although several FET is OK)
1-2-3. Service hint (Any picture / Remark)
W3
W2
W1
D932
SMFB14
D934
SMFB14
D935
SMFB14
D921
1SS355
D922
1SS355
D926
SMFB14
ZD912
READY
ZD904
BZX84-C16
ZD915
BZX84-C10
NC
ZD917
READY
C943
22nF
C935
470nF
/50V
C977
10nF
C978
102PF
C979
102PF
C982
READY
C938
68PF
1KV/125C
C933
10nF
C960 1u
F
C972
READY
C932
READY
GND
PFC_OUT
380V
PFC_TH
TH912
BG
12
TH913
0
TH914
PFC_PTC_SMD
FH912
12
FH911
12
P.GND
P.GND
P.GND
P.GND
P.GND
P.GND
P.GND
P.GND
T902
CM9720 PULSE
1
56
7
10
4
IC902
ICE1HS01G-1
1
FMIN
2
CS
3
FB
4
VINS
5
GND
6
LG
7
HG
8
VCC
Q905
IPA60R190E6
1G
3S
2D
Q906
IPA60R190E6
1G
3S
2D
F911
6.3A/250V
TP32
TP38
TP39
TP41
TP42
TP43
TP46
TP47
TP48
TP60
TP61
TP62
TP63
TP64
TP65
PC90
3
2
3
R980
R944
1M
R945
1M
R942
1M
R9A3
1M
R9A6
1M
R941
24K
1%
R950
10K
R949
22
R9B4
0OHM
R9A7
150
1W
R9B9
10K
R9B7
100
R9B8
4.7
R990
10K
R986
100
R988
4.7
R992
3.3
R993
3.3
R9A8
75
12
50X15
HS904
1
2
3
4
BC915
UBW2012-121F
BC911
UBW2012-121F
C934
0.039uF
1250V
C992
READY
C993
READY
T903
4
2
6
7
11
12
13
14
15
16
17
18
19
20
3
5
8
R927
2.7K
12
R951
12K
12
R9C4
12
C940
10nF
C939
22nF
C942
100nF
!
!
R951:24K=> 65KHZ
R951:20K=> 70KHZ
R951 15K 100KHZ
22k VINS :285V
ON/OFF:11.3~12.7V
FBH:4.5V OVERLOAD
Fixed Blanking Time:20ms
VCSL:0.8V
VCSH:1.63V
HS905 H/S
27T/8T:2T
230uH:65uH
25deg >330ohm
Vab:5V
Vth:1.25V
MARK:G2
Ivcc:5.8mA
70deg->2.2kohm
24k VINS :260V
< F911 >
If F911 is not short-circuit,
replace it with a same specifi cations one.
< Q905, Q906 >
If Q905, Q906 is short-circuit,
replace it with a new one.
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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