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14

9. DVD Part: Introduction of MTK1389D maintenance   

NOTE:  MTK1389D  is  a  type  of  LSIC  for  DVD  decode  .MTK1389D  IC  consists  of 
RF,SERVO,DSP,DECODE,VIDEO DAC and AUDIO DAC.

 

1. 

Under normal power supply conditions, the maintenance plan for MT1389D mono-chip is: first the reset 

circuit resets the MT1389D, after the crystal oscillator circuit gave the clock signal to MT1389D, MT1389D will 
start the initialization check for Flash

E

2

PROM

SDRAM, after everything is checked to be normal, it will start 

initialization check for built-in Audio DAC, servo and motor Driver IC . 

2. 

If  the  all  the  a.m.  parts  are  good,  then  MT1389D  will  send  signal  to  motor  Driver  to  drive  the  servo 

system

pick up then to generate DVD light for collection, tracing the main shaft to check if there is any disc, and 

confirm if it is CD format or DVD format disc. If the disc is in DVD format, the system will read the data from the 
disc directly; if it is in CD format built-in servo will drive the CD laser to send out CD light and read the data, the 
data then will be amplified through built-in RF amplifier and sent to MT1389D decode part for data processing, 
released by MPEG and resolved into video data and audio data, then they will be returned to analog signals 
through        built-in VIDEO DAC

AUDIO DAC. 

 

Decoder section 

3. 

There is power supply, clock and reset, but the system does not work. 

1

 

Check  if  all  the  address  wires  required  for  FLASH  are  exist,  and  if  they  are  in  normal  status, 

especially check if the A0~A15 of FLASH have normal signals, if there aren

t, then inspect MT1389D to see if 

there is faulty soldering. If there are normal signals at A0~A15, check if the address data  signal of MT1389D 
and SDRAM is normal. If it is normal, then check the signal at A16~A19 of MT1389D; if there are also signals, 
then check the video output    wires and AV filter circuit; if there is no signal, then check the corresponding pins 
of MT1389D to see if there is any short circuit, break or faulty soldering. 

4. 

System in normal operation, but the audio has no sound. 

1

 

Because the AUDIO DAC is built in MTK1389D IC.you need to check the lower passing amplifying 

circuit and the MUTE circuit at the back of the LPF circuit. Also check if there is any power supply to the LPF 
circuit. 

2

 

Check if the power supply voltage required for playing is at normal level. 

 

Servo Section 

5. 

After the LOGO of the machine shows normally, there is no OSD display. This problem mainly is caused 

by the abnormality built-in RF and servo, possible problems may be: 

1

 

Built in RF and its surrounding circuits have problems. 

2) 

Servo part of MT1389D has problems. 

6.      OSD display is normal

while there is no action of servo part

feeding motor does not work, main shaft does 

no turn, possible fault status are: 

1) 

The corresponding signals giving by MT1389D to DMSO

FMSO are missing, the reason may be the 

problem of MT1389D or the communication between MT1389D and motor Driver IC SA5668. 

2)   

Not  output from  Motor  Driver,  the  reason  may  be  the problem  on motor  Driver  or its  corresponding 
circuit. 

 

7. 

Servo part in good status, while there is no pick up action

no light, no focus

 

1

  No light, check the power supply

power supply for pick up

, or the light producing driving circuit to see 

if they are in normal status. 

 

  

      2

  No focus, check MT1389D to see if there is signal output from FOSO

TRSO. 

Secondly, check motor driver to see if there is F+

F-

T+

T-signal output. 

Thirdly, check the external corresponding circuit of the motor driver to see if there is any problem. 

 

8. 

All the servo part has action, while it cannot read out the disc 

1

   Check  MT1389D  if  there  is  RF  net  picture  output,  if  there  isn

t,  then  it  must  be  the  problem  of 

MT1389D and external surrounding circuits, it there is output, then it might the problem of MT1389D 
and its surrounding circuits. 

2

  There is RF signal

but not in normal status

then check MT1389D and surrounding circuits. 

3

    Everything is normal, but the disc cannot be read out, check MT1389D and its surrounding circuit 

 
 
 
 
 
 
 
 
 

                    

                                             

                          

Summary of Contents for MX-TM7414Mpeg4

Page 1: ...MX TM7414Mpeg4 l FEATURES l DVD TV14 COMBO l AUTO TUNE 218 CHANNES l DVD VCD SVCD CD CD R CD RW JPEG MP3 COMPATIBLE l FORMATO DE VIDEO 4 3PS 4 3LB l DOLBY AC 3 DECODE l PANATAL LOCK CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE TROUBLE CORRECTLY BEFORE OFFERING SERVICE ...

Page 2: ... precautions 3 2 TV block diagram 4 3 Replacement of memory IC 5 4 Service adjustment 5 5 ICs functional description 8 6 Test point waveform 10 7 All ICs voltages 10 8 Purity convergence adjustment 11 9 DVD maintenance 13 ...

Page 3: ...not check high voltage by drawing an arc Use a high voltage meter or a high voltage probe with a VTVM Discharge the picture tube before attempting meter connection by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10kΩ 2W resistor to the anode button 8 When service is required observe the original lead dress Extra precaution should be given to assure ...

Page 4: ... 4 2 Block diagram TDA9351PS N2 series with mono intercarrier sound demodulator ...

Page 5: ...data adjustment of corresponding factory menus Press EXIT key to exit factory mode Focus adjustment 1 Receive a crosshatch signal 2 While watching the screen adjust the FOCUS VR on the FBT to make the vertical and horizontal lines as fine and sharp as possible Geometrical adjustment Receive PAL standard complete pattern signal Adjustment steps a Adjust VSL to the centre horizontal line just appear...

Page 6: ...t 0 A 0BRI Listen Brightness 0 A 0COL Listen Colour 50 A 0SHP Listen Sharpness 50 A 1CON Soft Contrast 45 A 1BRI Soft Brightness 45 A 1COL Soft Colour 50 A 1SHP Soft Sharpness 50 A 6 Picture preset 2 2CON Standard Contrast 75 A 2BRI Standard Brightness 50 A 2COL Standard Colour 50 A 2SHP Standard Sharpness 60 A 3CON Dynamic Contrast 85 A 3BRI Dynamic Brightness 60 A 3COL Dynamic Colour 60 A 3SHP D...

Page 7: ...on Description Preset Remark Bit 6 HALFTONE 1 Enable 1 EA Bit 5 IDENT_SENSITIVE 1 EA Bit 4 HCO 1 Enable 0 EA Bit 3 LOGO 1 EA Bit 2 TILT 0 EA Bit 1 SPANISH 1 EA Bit 0 ROMANIA 0 EA 5 OP5 Bit Function Description Preset Remark Bit 7 STORE_AV 1 Enable 1 EA Bit 6 OSO 1 Enable 0 EA Bit 5 SOFR_CHANGE 1 Enable 0 EA Bit 4 FADE 1 Enable 0 EA Bit 3 SOUND_M 1 Enable 0 EA Bit 2 SOUND_I 1 Enable 0 EA Bit 1 SOUN...

Page 8: ... DESCRIPTION STAND BY output 1 In STAND BY mode low level Power OFF For Power ON this pin will be high SCL 2 I2 C bus clock line SDA 3 I2 C bus data line TUNING 4 tuning Voltage Vt PWM output KEY 5 Control keys input SYSTEM 6 TV system control VOL 7 Sound Volume control PWM output MUTE 8 Sound mute output VSSC P 9 Digit ground for μ controller core and periphery CTL 10 DVD power control STANDBY 11...

Page 9: ... B input U B Y input PB input BCLIN 49 Beam current limiter input BLKIN 50 Black current input RO 51 Red output GO 52 Green output BO 53 Blue output VDDA 54 Analog supply of Closed Caption decoder and digital supply of TV processor 3 3 V VPE 55 Ground VDDC 56 Digital supply to core 3 3 V OSCGND 57 Oscillator ground supply XTALIN 58 Crystal oscillator input XTALOUT 59 Crystal oscillator output RESE...

Page 10: ...V FEEDBACK 9 Vertical feedback GND 5 Ground 5 U101 Tuner PIN Function PIN Function 1 AGC 7 5V 2 vacant 8 vacant 3 Gnd 9 Vt 33V 4 SCL 10 Gnd 5 SDA 11 IF Out 6 5V 6 Test point Waveforms 7 IC voltages 5Vpp 0 9Vpp 1 3Vpp H H 1Vpp V CRT KB CRT KG CRT KR 95Vpp 95Vpp 95Vpp H H H TDA9351 PIN53 2 5Vpp 2 5Vpp 3 8Vpp H H H TDA9351 PIN52 TDA9351PIN51 TDA9351 PIN33 TDA9351 PIN34 0 8Vpp V TDA9351 PIN21 TDA9351 ...

Page 11: ... 38 39 40 41 42 43 44 45 46 47 48 V 0 5 0 3 0 1 7 2 4 3 4 8 3 9 0 3 3 0 3 6 1 4 2 5 2 5 2 5 PIN 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 V 1 9 5 0 2 4 2 4 2 4 3 1 0 3 2 0 1 8 1 7 0 3 2 5 1 3 3 5 TDA8357 PIN 1 2 3 4 5 6 7 8 9 V 0 8 0 7 16 6 9 0 43 7 2 0 3 7 2 AN 7522N PIN 1 2 3 4 5 6 7 8 9 10 11 12 V 10 4 4 0 4 4 2 75 1 4 0 1 4 0 35 4 4 0 4 4 24C08 PCF8598 PIN 1 2 3 4 5 6 7 8 V 0 0 5 1 0 3 2...

Page 12: ...the screen Fig 3 8 Move the deflection yoke forward and fix the position of the deflection yoke so that the whole screen will become green 9 Insert the wedge to the top side of the deflection yoke so that it will not move 10 Input a crosshatch signal 11 Verify that the screen is horizontal 12 Input red and blue raster signals and make sure that purity is properly adjusted CRT WEDGE DEFLECTION YOKE...

Page 13: ...t convergence DYNAMIC CONVERGENCE ADJUSTMENT 1 Move the deflection yoke up and down and overlap lines in the periphery Fig 2 2 Move the deflection yoke left to right and overlap the lines in the periphery Fig 3 3 Repeat 1 and 2 above and make the best convergence After adjustment fix the wedge at the original position Fasten the retainer screw of the deflection yoke Fix the 6 magnets with glue FRO...

Page 14: ...onding pins of MT1389D to see if there is any short circuit break or faulty soldering 4 System in normal operation but the audio has no sound 1 Because the AUDIO DAC is built in MTK1389D IC you need to check the lower passing amplifying circuit and the MUTE circuit at the back of the LPF circuit Also check if there is any power supply to the LPF circuit 2 Check if the power supply voltage required...

Page 15: ...CN602 CN601 B SCL SDA AGC 9 GND BT 11 IF 10 8 3 1 5 4 6 7 2 TU101 TEDE9 276A 16V 10μF C107 104 C202 C201 10u KA33V DZ201 A1 33V D2901C SF101 MTZJ9 1B DZ101 16V 47μF C108 BF370 V101 1 6W 10 R104 1 6W 13K R105 1 6W 470 R106 25V 220μF C102 MTZJ5 1B DZ102 63V 0 1μF C101 1 6W 68K R261 1N4148 VD217 1 6W 9 1K R260 1 6W 1K R227 1 6W 9 1K R262 B4 12V C214 104 SYSTEM 1W 33 R110 LGA0203 100 L102 SDA SCL 1 6W...

Page 16: ...15 Sincere Forever Haier Group Haier Industrial Park No 1 Haier Road 266101 Qingdao China http www haier com ...

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