manualshive.com logo in svg

Memorex MT2025D - 20" CRT TV, Service Manual

Share
Download
Memorex MT2025D - 20

 

 

 
 
 

 
 

 

 

 

SERVICE MANUAL 

Colour Television

 

 
 
 
 
 

 

 
 
 
 

 

Haier model:

 

21F7A 

Customer model: 

MT2025D 

 

 

l

 

FEATURES 

         

l

 

DVD-TV 21

”

 COMBO 

l

 

AUTO TUNE/181 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

 

l

 

ATSC TUNER

 

l

 

AC/DC

 

 

 

 
 

CAUTION                                                  READ 
THIS  MANUAL  CAREFULLY  TO  DIAGNOSE 
TROUBLE  CORRECTLY  BEFORE  OFFERING 
SERVICE .                                                   

PDF 

文件使用

 "pdfFactory Pro" 

试用版本创建

   

ÿ

       

www.fineprint.com.cn

Summary of Contents for MT2025D - 20" CRT TV

Page 1: ... l AUTO TUNE 181 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 l ATSC TUNER l AC DC CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE TROUBLE CORRECTLY BEFORE OFFERING SERVICE PDF 文件使用 pdfFactory Pro 试用版本创建 ÿ www fineprint com cn ...

Page 2: ...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 PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Page 3: ...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 correct lead dress in the ...

Page 4: ... 4 2 Block diagram R2J10165GC series with stereo intercarrier sound demodulator PDF 文件使用 pdfFactory Pro 试用版本创建 ÿ www fineprint com cn ...

Page 5: ...n to return to the normal screen 4 SERVICE ADJUSTMENT Specific operation use remote controller Press MENU à 8 à 8 à 9 à 3 buttons in sequence to enter into factory mode Press MENU to enter into next factory menu Press Program Program to select items and press VOLUME VOLUME key to make data adjustment of corresponding factory menus Press EXIT key to exit factory mode Focus adjustment 1 Receive a cr...

Page 6: ...emperature 9300K 3 JND A3 Error Detection Process 1 Check to see if Fuse is normal No light and sound Abnormal CheckD901 D904 C914 IC9601 Q901 Checktoseeifthe collectorvoltageof D909is13 5V The failure ofhorizontal unit orN204 Check to see if ZD201 8v is normal Check the control voltage of Q207 or CPU power pin Check IC602 ect Normal Normal Normal Abnormal Checktosee110V 180V etc voltageisnormal T...

Page 7: ...al Normal Check the voltage of all pins of SK501 Heater Resistor open Check to see if be voltage of Q402 is existed Check the circuit from pin15 of IC201 to Q402 No raster Whether G2 voltage is normal Change wrong component or check peripheral Check to see if 8V voltage is normal at PIN 10 or 14 of IC201 Check X201 IC201 and peripheral circuit of IC201 Check 8V 5V power Abnormal Normal Test filame...

Page 8: ... Multimeter is at range RΧ1K Red probe connects to ground Touch No 5 of IC401 with black probe Bright line flashes for a moment Horizontal bright line Snowy noise exist No sound and picture Not exist Exist Check to see if RAGC is at 00 mode Check to see if voltage output available at tuner Enter D MODE with customer remote controller Make RAGC tuned to 25 or so Noise on picture just disappears Ins...

Page 9: ...ts of IC701 Inspect C713 C714 Check to see if 16V exists Inspect IC201 and peripheral component of IC201 Inspect 16V power supply Yes No Yes No Yes No Have noise No noise Inspect Inspect the circuit from No 51 of IC201 to No 3 of SK501 Yes No Change V501 or weld V501 again Check to see if voltages of SK501 are normal Lack of red Check to see if V501 is open or not well welded Inspect R502 R503 R50...

Page 10: ...t R GB YUV 128 128 0 IN YUV Black level offset G BB YUV 128 128 0 IN YUV Black level offset B RD YUV 128 128 0 IN YUV White point R BD YUV 128 128 0 IN YUV White point B CR PEDDOT 0 15 8 CR benchmark voltage adjust CB PEDDOT 0 15 8 CB benchmark voltage adjust CRCB PED ON 0 1 1 YUV benchmark voltage switch CRCB GAIN UP 0 1 0 YUV benchmark voltage plus P4 Items Preset Remark Description VIF VCO OK O...

Page 11: ...19 ATV software edition P8 Items Preset Remark Description AUTO N PM PN 0 1 1 AUTO N PM PN function choice AUTO N N4 P 0 1 0 AUTO N PM PN function choice PAL 0 1 0 PAL 0 N 1 Y NTSC 0 1 1 NTSC ON Y OFF N N443 0 1 1 NTSC4 43 ON Y OFF N P358 0 1 0 3 58PAL 0 N 1 Y PAL M 0 1 0 PAL M ON Y OFF N PAL N 0 1 0 PAL N ON Y OFF N P9 Items Preset Remark Description AV2 0 1 1 AV2 1 Y 0 N YUV 0 1 0 YUV 1 Y 0 N DV...

Page 12: ... PWM TEST0 5 TEST0 P04 AD2 6 P04 AD2 P05 AD1 7 P05 AD1 P06 TIM31 8 P06 TIM31 AFT AD0 9 SIF auto phase control DEF VCC 8 0V 10 8V POWER V RAMP 11 V RAMP VRAMP CAP 12 VRAMP CAP AFC 1 FIL 13 SIF auto phase control filter DEF VCC 5 0V 14 5V POWER H OUT 15 Horizontal SIGNAL OUT FBP IN 16 FBP IN DEF GND 17 GND VRAMP AGC 18 VRAMP AGC Cb IN YcbCr 19 Cb IN YcbCr Cr IN YcbCr 20 Cr IN YcbCr C APC 21 C APC XT...

Page 13: ...ITOR OUT 55 MNITOR OUT MCU RESET 56 MCU RESET P20 57 P20 P21 58 P21 P22 59 P22 HLF 60 HLF VHOLD 61 VHOLD CVIN 62 CVIN P26 AD6 63 P26 AD6 AD6 P27 64 AD6 P27 P35 TIM21 65 P35 TIM21 CNVSS 66 CNVSS TEST1 Note1 67 TEST1 Note1 TEST2 Note2 68 TEST2 Note2 VSS 69 VSS FILT 70 FILT VDD 71 VDD P36 72 P36 P17 INT3 AD4 73 P17 INT3 AD4 P16 INT2 AD3 74 P16 INT2 AD3 P15 INT1 75 P15 INT1 P10 76 PIN 10 P11 SCL1 77 I...

Page 14: ...tage supply 6 Output stage supply SUPPLY VOLTAGE 2 Supply voltage Input 7 Non inverting input Flyback generator 3 Flyback generator GND 4 Ground or negative supply Output 5 Output 5 U101 Tuner PIN Function PIN Function 1 Nc 7 5V 2 Tu 8 IFA1 3 Rf agc 9 IF AGC 4 SCL 10 IFD 1OUT 5 SDA 11 IFD 2 OUT 6 Btl 6 Test point Waveforms 5Vpp 0 9Vpp 1 3Vpp H H 1Vpp V CRT KB CRT KG CRT KR 95Vpp 95Vpp 95Vpp H H H ...

Page 15: ... 3 3 3 45 2 4 3 43 3 15 3 43 PIN 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 V 2 47 8 03 2 57 2 49 2 59 8 87 0 42 4 9 4 94 4 95 3 82 1 96 0 33 2 9 4 95 4 94 PIN 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 V 4 95 0 0 16 4 95 0 1 76 4 95 4 95 4 94 4 83 0 03 4 95 3 52 3 7 3 58 3 73 STV9302A PIN 1 2 3 4 5 6 7 V 2 993 26 8 14 57 0 1 96 26 05 2 991 TFA9800J PIN 1 2 3 4 5 6 7 8 9 V 2 15 0 7 53 7 ...

Page 16: ...e 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 P 4 6 P PURITY MAGNET 4 4...

Page 17: ...ERGENCE 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 FRONT VIEW Fig 1 FRONT VIEW R...

Page 18: ...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 ...

Page 19: ...14 Sincere Forever Haier Group Haier Industrial Park No 1 Haier Road 266101 Qingdao China http www haier com PDF 文件使用 pdfFactory Pro 试用版本创建 www fineprint com cn ...

Reviews:

No comments

Brands by name

Popular brands

Load more brands