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Tovis MTG-1960XT, Service Manual

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Tovis MTG-1960XT Service Manual Download Page 24

 

TOVIS P/N 

MTG-1960XT 

DATE 

2002.03.11 

REV NO. 

0 

TOVIS 

 

Color Monitor Service Manual 

PAGE 

24/30 

 
8-6. FBT (Fly-back Transformer) 
    The high voltage for CRT anode focus, G2 voltage for CRT and -12V for 

vertical deflection are generated by the FBT. 

        Also, -130V for G1 voltage, -12V for the vertical supply voltage are extracted 

from the FBT. 

 
8-7. ABL (Automatic Beam Limiting) 
        The voltage of pin 7 is affected by the current anode of FBT. 
    So, when the voltage at pin 7 of FBT is decreased, the anode current is 

increased accordingly. When the anode current is increased, contrast is set at 
the certain limited level (

22FT

 With/Touch, in white pattern) that is set by inner 

  voltage of IC401. 

 
8-8.  Video amplification section. 
    8-8.1. Video pre-amplifier (IC401) 
         Input video signals are amplified by means of IC401, and the amplified 

signals drive the video output stage (IC402). 

        Video gain is adjusted by DC voltage at pin 12 for ABL control. 
 
    8-8.2. Video output stage (IC402) 
         The video output signal from IC401 is amplified again by IC402, and 

IC402 apply video signal to each cathode of CRT. 

         Q405, Q406 and Q407, which is operated by I2C BUS control through 

u-com, adjust cutoff voltages. 

 

8-8.3. OSD (On Screen Display: IC403) 

        The OSD signal is applied from IC403 to IC402. 
                It is controlled by I

2

C BUS control line. 

 
 
 
 
 
 

TOVIS CO., LTD. 

 

 

Summary of Contents for MTG-1960XT

Page 1: ...TOVIS P N MTG 1960XT DATE 03 11 02 REV NO 0 TOVIS IGT P N 69923602 69923603 PAGE 1 30 Color Monitor Service Manual MODEL MTG 1960XT TOVIS CO LTD ...

Page 2: ...or Service Manual PAGE 2 30 I N D E X 1 SAFETY PRECAUTIONS 3 2 SPECIFICATIONS 4 3 TECHNICAL FEATURES 5 4 TIMING CHART 6 5 SET UP 9 6 CONTROLS AND ADJUSTMENTS 10 7 ADJUSTMENT SPECIFICATIONS 18 8 DESCRIPTION OF CIRCUIT OPERATION 21 9 TROUBLE SHOOTING 25 TOVIS CO LTD ...

Page 3: ... parts list Before replacing these components read the parts list in this manual carefully 1 3 When replacing chassis in the cabinet always be certain that all the protective devices are installed properly such as insulating covers strain relief etc 1 4 Before replacing the back cover of the set thoroughly inspect inside the cabinet to see that no stray parts or tools have been left inside 1 5 Bef...

Page 4: ...ontal Sync TTL Level Positive or Negative pulse Scanning 28Khz 70KHz Vertical Input TTL Level Positive or Negative pulse Scanning 40 160Hz 2 3 Power Supply Power Input AC100 240V 60 50Hz Fuse Rating 250V 50T 3 15A Power Consumption Normal less than 130W DPMS less than 20W 2 4 External Control Refer to page 7 2 5 Operating Temperature 0 55 2 6 Operating Humidity 10 90 Non condensing 2 7 Net weight ...

Page 5: ... in the circuit the protection circuit operates in order to prevent the components from electrical shock or other risks 3 4 Override function The override function is designed for the normal display when the monitor is powered on without connection from the source No signal message 3 5 Control panel If you are not satisfied with the factory mode size position or color settings use these control pa...

Page 6: ...Hz A 31 778 31 778 28 251 26 667 B 3 813 3 813 3 920 2 032 C 1 907 1 589 1 247 3 810 D 25 422 25 422 22 806 20 317 E 0 636 0 318 0 170 0 508 H POL NEGATIVE NEGATIVE POSITIVE NEGATIVE FH 70 087Hz 59 940Hz 86 960KHz 75 000Hz A 14 268ms 16 683ms 11 500ms 13 333ms B 0 064ms 0 064ms 0 113ms 0 080ms C 1 112ms 0 794ms 0 563ms 0 427ms D 12 711ms 15 253ms 10 810ms 12 800ms E 0 381ms 0 064ms 0 014ms 0 027ms...

Page 7: ... 677 B 3 200 1 616 2 400 2 231 C 2 200 3 232 1 280 1 615 D 20 000 16 162 16 000 15 754 E 1 000 0 323 1 119 0 998 H POL POSITIVE POSITIVE POSITIVE NEGATIVE FV 60 317Hz 75 000Hz 72 188Hz 60 004Hz A 16 579ms 13 333ms 13 853ms 16 666ms B 0 106ms 0 064ms 0 125ms 0 124ms C 0 607ms 0 448ms 0 478ms 0 600ms D 15 840ms 12 800ms 12 480ms 15 880ms E 0 026ms 0 021ms 0 772ms 0 062ms V POL POSITIVE POSITIVE POSI...

Page 8: ...1 016 C 2 702 1 920 2 235 2 296 2 201 D 14 222 13 653 13 003 11 852 10 836 E 0 569 0 321 0 203 0 360 0 508 H POL POSITIVE NEGATIVE POSITIVE POSITIVE POSITIVE FV 85 062Hz 70 069Hz 75 029Hz 60 020Hz 84 997Hz A 11 756ms 14 272ms 13 328ms 16 638ms 11 765ms B 0 056ms 0 106ms 0 050ms 0 047ms 0 044ms C 0 503ms 0 513ms 0 466ms 0 594ms 0 524ms D 11 179ms 13 599ms 12 795ms 16 005ms 11 183ms E 0 019ms 0 054m...

Page 9: ...omatically when you insert the power plug to power source 5 2 Signal cable Connection Connect the 15pin signal cable to the source And lock both screws to ensure that the monitor is properly grounded 19 1 AMP 19pin connector NO DESCRIPTION NO DESCRIPTION 1 SIGNAL CABLE GND 11 TOUCH_RxD 2 VIDEO RED 12 NET GND 3 VIDEO BLUE 13 AC GND 4 VIDEO GREEN 14 AC2 5 HOR SYNC 15 AC1 6 VER SYNC 16 A GND 7 VIDEO ...

Page 10: ...ussing if the OSD isn t displayed DOWN UP When the Main Menu is displayed search each function using these keys When the Sub Menu is displayed after select the function you can change each state of the screen using these keys O S D Control Sub P C B 6 2 O S D CONTROL METHOD 1 Control items Location Adjustment Method Function SUB PCB OSD Control Brightness Contrast Horizontal Position Horizontal Si...

Page 11: ...SEL key Then the BRIGHTNESS OSD color changes from yellow to red 4 Adjust Brightness as much as you want using UP DOWN key 5 After finishing the Brightness adjustment Press the MODE key then The BRIGHTNESS OSD color should change from red to yellow and be saved automatically 6 If you want to adjust other functions search your sub menu For example if you want to adjust the CONTRAST use the UP DOWN ...

Page 12: ...H SIZE ADJUST SAME WAY AS ABOVE E V POSITION ADJUST SAME WAY AS ABOVE F V SIZE ADJUST SAME WAY AS ABOVE G PINCUSHION ADJUST SAME WAY AS ABOVE H TRAPEZOID ADJUST SAME WAY AS ABOVE I PARALLELOG ADJUST SAME WAY AS ABOVE J PIN BALANCE ADJUST SAME WAY AS ABOVE K COLOR ADJUSTMENT 1 Press the MODE key then Main Menu OSD come out as left below figure min 1 99 max TOVIS CO LTD ...

Page 13: ...ust the RED GREEN or BLUE by using the UP DOWN key 7 Press the MODE key to finish the color adjustments then the OSD will go back to the Main Menu 8 Press the MODE key again to finish the adjustment The OSD will disappear L RECALL When you press the RECALL key all user s adjustment values are erased and covered by factory adjustment value At first stage without any user s adjustment the monitor se...

Page 14: ...UAGE ENGLISH FRANCAIS ESPANOL PORTUGUES Factory control This monitor has two adjustment modes One is for user s own adjusting and other is for the factory adjustment Sometimes it will need to revert back to the factory adjustment mode for repair After the factory adjustment you can readjust to your adjustments refer to item 6 3 A Factory mode entering Press the MODE and DOWN keys simultaneously un...

Page 15: ... B Exit and save 1 After finish the adjustment search RECALL using UP DOWN key 2 Press SEL key until OSD disappears then the adjusted value will be saved and will exit from the factory mode C Adjustment All adjustment methods are the same with user s control mode except for COLOR TOVIS CO LTD ...

Page 16: ... area s adjustment and BIAS means low beam area s adjustment 5 Select any item by pressing the SEL key then the OSD changes to under sub menu as below right figure 6 Adjust color temperature using UP DOWN and SEL key UP DOWN key moves item position SEL key change value 7 At the GAIN mode CO means sub contrast adjustment Sub contrast adjusted using the UP DOWN key if necessary To meet the white pea...

Page 17: ...TOVIS P N MTG 1960XT DATE 2002 03 11 REV NO 0 TOVIS Color Monitor Service Manual PAGE 17 30 9300 GAIN 9300 BIAS 6500 GAIN 6500 BIAS At RG GG GAIN BG CO OR At RB GB BIAS BB SEL and UP DOWN TOVIS CO LTD ...

Page 18: ...t the cross hatch pattern with the 48KHz 1024 768 mode 2 After connecting a digital voltage meter to the each pin of D316 anode and cathode adjust FBT B voltage to 114V 1 0V using VR301 7 3 2 G2 Voltage adjustment 1 Input the cross hatch pattern with 48KHz 1024 768 mode 2 After connecting a DC high voltage meter to the G2 of the CRT socket adjust G2 voltage to 600V 10V by changing SCREEN VR of FBT...

Page 19: ...d Y 0 311 0 015 by R G B gain on OSD menu 3 Adjust CONTRAST to be 40FT With Touch 7 3 6 Purity and Convergence Adjustment 1 Purity Adjustment Demagnetize the picture tube and cabinet using a degaussing coil Turn the CONTRAST and BRIGHTNESS controls to maximum Adjust RED and BLUE bias controls to provide only a green raster Loosen the clamp screw holding the yoke and side the yoke backward to provi...

Page 20: ...d and blue vertical lines in the center area of the picture screen Turn both tabs at the same time keeping their angles constant to superimpose red and blue horizontal lines at the center of the screen See figure 2 Adjust two tabs of 6 Pole Magnets to superimpose red blue line with green one Adjusting the angle affects the vertical lines and rotating both magnets affects the horizontal lines Repea...

Page 21: ...Hz Resolution Hf kHz Vf Hz CS3 38 CS2 39 CS1 40 SUS 4 1 31 70 720x400 28 32 9 68 72 L L L H 2 31 60 640x480 58 62 L L L H 3 35 86 1024x768 33 35 9 84 88 H L L H 4 38 75 640x480 36 40 9 73 77 H H L H 5 38 60 800x600 36 40 9 58 62 H H L H 6 47 75 800x600 41 51 9 73 77 H L H H 7 48 72 800x600 70 74 H L H H 8 48 60 1024x768 58 62 H L H H 9 53 85 800x600 52 61 9 83 87 L H H H 10 56 70 1024x768 68 72 L ...

Page 22: ... IC301 and it is used for H scan voltage control driver 5 X ray protection When the fly back voltage rises up to an unacceptable level x ray protection is activated X ray input pin 13 of IC601 is above 4V This result is that complete line drive stage stops working The reset of this protection is obtained by Main power off 8 2 2 Vertical section 1 Vertical oscillation The free running frequency of ...

Page 23: ...1 Line driver stage As a driver device small MOSFET Q307 IRF630 is used The driver transformer T302 is equipped with a snubber circuit R327 C309 at the primary side to damp excessive ringing 8 5 2 Horizontal power output stage The horizontal power output stage is a conventional one with a diode modulator As a deflection transistor the Q308 2SC5682 is used To compensate the horizontal linearity T30...

Page 24: ...creased contrast is set at the certain limited level 22FT With Touch in white pattern that is set by inner voltage of IC401 8 8 Video amplification section 8 8 1 Video pre amplifier IC401 Input video signals are amplified by means of IC401 and the amplified signals drive the video output stage IC402 Video gain is adjusted by DC voltage at pin 12 for ABL control 8 8 2 Video output stage IC402 The v...

Page 25: ...ce Manual PAGE 25 30 9 TROUBLE SHOOTING 9 1 NO POWER NO POWER CHECK C101 AC LEVEL NO CHECK REPLACE F101 POWER CORD F101 YES CHECK C104 DC LEVEL NO CHECK REPLACE BD101 YES CHECK IC101 1 WAVEFORM NO CHECK REPLACE IC101 YES CHECK REPLACE SECONDARY VOLTAGE OF T101 TOVIS CO LTD ...

Page 26: ...30 9 2 NO VIDEO NO VIDEO CHECK SIGNAL CABLE CHECK IC401 21 24 26 PULSE CHECK IC401 23 DC LEVEL 18 19 PULSE CHECK REPLACE IC601 Q204 NO YES CHECK REPLACE SIGNAL CABLE NO NO YES YES CHECK REPLACE IC401 CHECK IC402 1 3 5 PULSE NO CHECK REPLACE IC402 YES CHECK REPLACE CRT SOCKET G1 TOVIS CO LTD ...

Page 27: ...nitor Service Manual PAGE 27 30 9 3 NO RASTER NO RASTER YES CHECK REPLACE Q113 Q307 D315 CHECK HV G2 CHECK Q308 WAVEFORM CHECK G1 DC 80V CHECK L304 DC 55V CHECK REPLACE FBT CRT NO NO YES CHECK REPLACE D110 NO YES YES NO CHECK REPLACE Q507 Q508 Q509 TOVIS CO LTD ...

Page 28: ...onitor Service Manual PAGE 28 30 9 4 TROUBLE IN HORIZONTAL SIZE YES CHECK IC601 19 WAVEFORM CHECK Q309 COLLECTOR WAVEFORM H SIZE NO CHECK REPLACE IC601 CHECK REPLACE Q309 NO YES CHECK IC301 24 WAVEFORM CHECK REPLACE IC302 YES NO CHECK REPLACE IC301 TOVIS CO LTD ...

Page 29: ...11 REV NO 0 TOVIS Color Monitor Service Manual PAGE 29 30 9 5 TROUBLE IN CONTRAST CONTRAST CHECK IC401 12 VOLTAGE NO CHECK REPLACE IC401 R518 ZD501 YES CHECK IC401 18 WAVEFORM NO CHECK REPLACE IC601 YES CHECK REPLACE IC401 TOVIS CO LTD ...

Page 30: ...960XT DATE 2002 03 11 REV NO 0 TOVIS Color Monitor Service Manual PAGE 30 30 9 6 TROUBLE IN BRIGHTNESS BRIGHTNESS CHECK G1 VOLTAGE NO CHECK REPLACE Q202 YES CHECK C504 VOLTAGE NO CHECK REPLACE R520 D506 YES CHECK REPLACE Q507 Q508 ...

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