Tatung VM9K9DA P990S Service Manual Download Page 13

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5-3 TRANSISTOR & DIODE CIRCUIT

LOCATION

FUNCTION AL DESCRIPTION

D101

For C102 Discharge

Q101

For LED Indicator Control

D418

Protection Diode for Snubber Clip Diode ZD401

D431

Protection Diode for B+ Control

D405

Speed up for Q403

D406

Supply a bias for D408

D408

Damping Diode and Modulation Diode

Q416 B+

MUTE

D414~ D417,D419

Buffer Diode for IC403

D421 ~ D423

Detected for Q406

Q401

B+ Mute Control

Q402 Horizontal

Driver

Q403

Horizontal Out Put

Q404, Q406

A differential Amp for Drive Q405

Q405

Darlington Transistor for H-Size Control

Q407

Horizontal Linearity Correction Control

Q410, Q412, Q417

Horizontal S-Correction Control

Q418, Q420

Horizontal S-Correction Control

ZD601,ZD602

VF Voltage Divider

D707 Mixing

Diode

D704

Rectifier for 250V Supply

D705

Protection Diode for Q708

Summary of Contents for VM9K9DA P990S

Page 1: ...SERVICE MANUAL COLOR MONITOR VM9K9DA P990S...

Page 2: ...ON 11 14 6 TROUBLE SHOOTING CHART 15 6 1 NO RASTER CRT RELATIVE CIRCUIT PROBLEMS 15 6 2 ABNORMAL DISPLAY 17 6 3 NO BLANKING 18 6 4 HOR OSC DEF HV CIRCUIT FAULT 18 6 5 ABNORMAL HORIZONTAL DEFLECTION 19...

Page 3: ...Positive Vert Sync TTL Level TTL Level TTL Level TTL Level Positive Negative Negative Positive Horizontal 640 H 720 H 640 H 800 H Vertical 480 V 400 V 480 V 600 V Fh kHz 31 47 31 47 43 269 53 67 Fv Hz...

Page 4: ...o 85 Relative Non Condensing 14 Weight 20 0 Kgs Net 23 6Kgs Gross for 9Klr 15 Dimensions Monitor Carton 570 W 545 H 655 D mm Monitor 436 W 455 H 446 D mm for 9Klr 16 External Connection 15 Pin D type...

Page 5: ...fety test must be performed to verify that the display is safe to operate without danger or shock Always perform an AC leakage current check on the exposed metallic parts of the cabinet such as screw...

Page 6: ...ly It is important to maintain specified values of all components in the horizontal and high voltage circuits and anywhere else in the monitor that could cause a rise in high voltage or operating supp...

Page 7: ...on the connector to ensure firm grounding The connector information is as follow 15 Pin Color Display Signal Cable PIN NO DESCRIPTION PIN NO DESCRIPTION 1 RED 9 NC 2 GREEN 10 GND 3 BLUE 11 SYNC GND 4...

Page 8: ...Connect a DC Volt meter between TP901 or D922 cathode and ground then adjust VR901 to be 15VDC C Connect a DC Volt meter between TP902 or D925 cathode and ground then adjust VR902 to be 49VDC B D Con...

Page 9: ...SIZE R BIAS ZOOM G BIAS TOP COMER R BIAS BOTTOM COMER 9300 COLOR TEMPERATURE PINCUSHION 6500 COLOR TEMPERATURE TRAPEZOID DEGAUSS PIN BALANCE OSD EXIT PARALLELOGRAM RETURN ROTATION Vs LINEAR Vs SUB V...

Page 10: ...B Gain R Gain to make color temperature x 283 10 y 297 10 C Recheck item A B to make sure both of them in spec Finally select OSD function to the 9300 K function then press the MENU Key To make the se...

Page 11: ...ed by varying the two tabs together keeping the angle between them constant 5 CIRCUIT DESCRIPTION 5 1 MICRO CONTROLLER CIRCUIT MICRO Controller The IC101 contains a 6502 8 bit CPU core 256 bytes of RA...

Page 12: ...an extensive set of geometry control facilities Further the IC generates the drive waveforms for DC coupled vertical boosters to the TDA 4866 ref Page 28 Horizontal Oscillator The oscillator is of th...

Page 13: ...on Diode Q416 B MUTE D414 D417 D419 Buffer Diode for IC403 D421 D423 Detected for Q406 Q401 B Mute Control Q402 Horizontal Driver Q403 Horizontal Out Put Q404 Q406 A differential Amp for Drive Q405 Q4...

Page 14: ...ut Voltage Supply D921 D923 Rectifier for Output Voltage Supply D924 Clip Diode for Trigger CKT D925 Rectifier for B Supply D926 D927 Raster Position Control D939 Clip Diode for Snuffer Pulse ZD901 Pr...

Page 15: ...AGE CHECK THE VOLTAGE OF CRT HEATER ABOUT 6 3V CHECK VOLTAGE OF THE CRT CHECK BRIGHTNESS CIRCUIT OK CHECK POWER SAVING CIRCUIT ABNORMAL DISPLAY H SYNC V SYNC SIGNAL REFER ITEM 8 2 CATHODE ABOUT 60V TO...

Page 16: ...TERFACE CARD CONTRAST SET MAX OR IC401 PIN 16 OUTPUT CHECK IC801 PIN 13 ABOUT 4V PIN 6 9 22 ABOUT 12V CHECK IC801 PIN 15 CLAMP PULSE PIN 18 20 23 ABOUT 4Vpp CHECK THE IC105 RELATIVE CIRCUIT PIN 16 BLA...

Page 17: ...Vpp CHECK THE VOLTAGE OF FBT SCREEN CHECK THE RELATIVE CIRCUIT CHECK THE 12V PIN OF SMPS ON MAIN PCB RELATIVE CIRCUIT OF P802 CONNECTOR ABOUT 400V TO 700V EXCEED 700V OF IC801 CHECK FBT CRT RELATIVE C...

Page 18: ...OSC DEF HV CIRCUIT FAULT 1 NO RASTER DISCONNECT WITH SIGNAL CABLE NG OK OK OK NG NG NG CHECK THE COLLECTOR VOLTAGE CHECK THE COLLECTOR VOLTAGE RELATIVE CIRCUIT RELATIVE CIRCUIT CHECK IC401 PIN 26 31 C...

Page 19: ...CK THE HV OF CHECK FBT B VOLTAGE Q911 Q912 Q914 Q915 IC401 PIN 4 5 6 VR 902 ABOUT 60 5V AT FH 31KHz CRT ABOUT 26KV 2 ABNORMAL HORIZONTAL RASTER CENTER P403 AND JUMPER CHECK T903 D926 D927 R964 R968 3...

Page 20: ...CUIT RELATIVE CIRCUIT NG CHECK THE IC601 PIN 7 ABOUT 40V CHECK IC601 PIN 6 OUTPUT ABOUT 38Vpp CHECK ZD601 ZD602 R626 SMPS CHECK IC401 PIN 22 23 24 CHECK IC401 PIN 12 13 2 VERTICAL CENTER NG READJUST V...

Page 21: ...S LEAD WIRE CRT SOCKET CRT 6 9 NO SOUND FOR AUDIO MODEL ONLY OK OK OK OK NG ENSURE THE SOUND SOURCE IS POWER ON ENSURE THE SOURCE CABLE CONNECTION CHECK POWER CHECK IC501 IC501 FAILURE SPEAKER FAILURE...

Page 22: ...G NG OK OK OK NG OK NG YES NO CHECK BRIDGE RECTIFIED CIRCUIT 6 3V CIRCUIT CHECK START C K T CHECK POWER SAVING C K T OFF MODE CHECK IC401 CHECK D919 CHECK Q911 Q911 FAILURE CHECK Q901 CHECK IC901 CHEC...

Page 23: ...23 7 MECHANICAL OF CABINET FRONT DIS ASSEMBLY...

Page 24: ...A 581 26 704 FOR CARTON PALLET 40A 581 624 5A TCO 99 LABEL 40A2035 615 5A ID LABEL 41A 68 508 A Card 41A 68 615 1B Warranty Statement 41A 68 615 4B TCO 99 CARD 41A 563 615 3A MANUAL 44A0288 3N SLIP SH...

Page 25: ...D1A1140 7 128 SCREW 4X7 FOR AC M1A1140 6 128 SCREW 705A769T C56 01 IC601 ASS Y 705A769T C87 01 AC 1 SOCKET CN901 705A790T C57 01 Q403 Q405 Q911 D408 ASS 705A988S C93 01 D921 ASS Y FOR P990S 1 705A990...

Page 26: ...00UF 20 50V C931 67A 305 101 10J 100u 160V JAMICON C931 67A 305 101 10L 100UF 160V C934 67A 215 391 GFH 390UF 80V LOW FSR BY C934 67A 215 391 GFL 390UF 80V C936 67A 305 102 6 1000UF 20 35V C937 67A 30...

Page 27: ...UT NTCR 100 OHM 15 NR630 61A 58 101 WT NTCR 100 OHM 15 NR901 61A 58 8 L NTCR 15OHM NR901 61A 58 8T L NTC SCK 152X PR901 61A 52 27 4W 9 OHM PTCR P105 33A3278 5 5 PIN P402 33A3192 4 4P PLUG P701 33A380...

Page 28: ...R TRANSFORMER T903 79A 167 111 HA Driver Transformer T903 79A 167 111 LA DRIVER TRANSFORMER TP401 9A 211 2 PIN 1 2X15MM TP701 9A 211 2 PIN 1 2X15MM TP901 9A 211 2 PIN 1 2X15MM VR701 75A 335 223 22K OH...

Page 29: ...C444 65A 442 221 13T 220PF 5 NPO 50V C445 64A176J 104 0T 0 1UF 5 63V C445 64A700J 104 0AT 0 1uF 50V 5 C446 67A 305 109 7T 1UF 20 50V C447 67A 305 109 7T 1UF 20 50V C448 65A 444 681 1T 680P 50V C451 6...

Page 30: ...22 0AT 2 2nF 50V 5 C959 64A176J 224 0T 22UF 5 63V D101 93A 64 11 52T DIODE 1N4148 D102 61A 602 100 52T 10 OHM 5 1 6W D401 95A 90 23 TIN COATED D402 93A 64 19G 52T BAV21 G I D402 93A 64 501 52T SWITCHI...

Page 31: ...T BEAD J006 71A 55 19 T BEAD J007 71A 55 19 T BEAD J055 61A 172 101 52T 100 OHM 5 1 4W J056 61A 172 101 52T 100 OHM 5 1 4W J087 61A 602 223 52T 22K OHM 5 1 6W J100 61A 172 102 52T 1K OHM 5 1 4W L101...

Page 32: ...Q913 57A 419 SG T KSC945C G TA FAIRCHILD Q914 57A 419 P T TRAN 2SC945P NEC TAPING Q914 57A 419 SG T KSC945C G TA FAIRCHILD Q915 57A 619 1 T 2SA673AC HITACHI Q916 57A 419 P T TRAN 2SC945P NEC TAPING Q...

Page 33: ...1 1 4W R437 61A 602 333 52T 33K OHM 5 1 6W R440 61A 172 154 52T 150K OHM 5 1 4W R441 61A 602 563 52T 56K OHM 5 1 6W R442 61A 602 472 52T 4 7K OHM 5 1 6W R444 61A 602 222 52T 2 2K OHM 5 1 6W R445 61A...

Page 34: ...0 23 TIN COATED R718 61A 602 103 52T 10K OHM 5 1 6W R719 61A 602 473 52T 47K OHM 5 1 6W R720 61A175L 125 52T 1 2M OHM 1 2W R721 61A 602 473 52T 47K OHM 5 1 6W R722 61A 602 103 52T 10K OHM 5 1 6W R724...

Page 35: ...2 103 52T 10K OHM 5 1 4W R981 61A 602 103 52T 10K OHM 5 1 6W R982 61A 172 471 52T 470 OHM 5 1 4W R983 61A 602 223 52T 22K OHM 5 1 6W ZD101 93A 39 73 52T HZ6B1 HITACHI ZD101 93A 39 530 52T ZENER DIODE...

Page 36: ...SPARK gap SG804 62A 10 16 W SPARK GAP 1KV BY C MAX AIR988S12 CRT BOARD FOR S990S 1 6A 31 4 BRASS FOR CRT SOCKET 715A 839 1 CRT BOARD FOR S781V C801 64A176J 104 0T 0 1UF 5 63V C802 64A176J 104 0T 0 1U...

Page 37: ...05 93A 64 11H 52T DIODE 1N4148 HITACHI D806 93A 64 11H 52T DIODE 1N4148 HITACHI D850 93A 64 19G 52T BAV21 G I D850 93A 64 507 52T FAST RECOVERY DIODE BAV2 D851 93A 64 19G 52T BAV21 G I D851 93A 64 507...

Page 38: ...72 333 52T 33K OHM 5 1 4W R818 61A 602 203 52T 20K OHM 5 1 6W R819 95A 90 23 TIN COATED R821 61A 172 151 52T 150 OHM 5 1 4W R822 61A 602 101 52T 100 OHM 5 1 6W R823 61A 602 101 52T 100 OHM 5 1 6W R824...

Page 39: ...55 2 A Heak sink M1A1730 8 128 SCREW M3x8 IC803 56A 551 501 LM2437T PFC988S PFC BOARD FOR P990S 1 PFC988SAI PFC AI ASS Y 11A6017 1 PCB SUPPORT 95A 205 30 072 UL1015 18BLK TOPCOAT 705A990P PFC 01 Q904...

Page 40: ...7A 724 2 2SK3115 705A769TC56 0 IC601 ASS Y 51A 200 1 Coolant 90A 351 500 A HEAT SINK M1A1730 10 128 SCREW M3x10 IC601 56A5002 1 TDA4866 PARENT NO 705A769TC87 0 AC 1 SOCKET CN901 87A 501 5 RECEPTACLES...

Page 41: ...30 8 128 SCREW M3x8 Q425 57A 728 1 2SB772 Q NEC Q425 57A 728 3 HSB772P HSB772E HI SINCE 705A990TC57 0 Q417 ASS Y 2A6003 1 SCREW NUT 90A6015 1 HEAT SINK M1A1730 8 128 SCREW M3x8 Q417 57A 610 501 IRF640...

Page 42: ...E D901 D904 CIRCUIT RETIFIER IC601 V OUTPUT Q802 Q807 O P AMP VIDEO Q817 Q819 H F B X RAY B VR902 B CONTROL H V PROCESSOR OFF CS0 CS6 V SYNC O H SYNC O B B G B R B B D G D R D SUSPEND DEGAUSS MUTE CPU...

Page 43: ...P26 P27 P16 INTE P10 AD0 P11 AD1 P12 HALFH0 P13 HALFH1 CE P14 P15 OSC1 OSC0 VDD DAC0 DAC1 DAC2 OUTPUT 3 OUTPUT 2 VCC OUTPUT 4 VCC OUTPUT 1 14 1 13 12 11 10 9 8 2 3 4 5 6 7 30 15 14 13 12 11 31 32 33...

Page 44: ...LLATOR HORIZONTAL H POSITION PLL1 AND FREQUENCY DETECTOR COINCIDENCE DETECTOR 2 I C BUS REGISTERS AND SOFT START PROTECTION V SIZE VOVSCN V POSITION V LINEARITY BALANCE V LINEARITY V OUTPUT H SIZE H T...

Page 45: ...NB INA 6 9 4 2 1 8 3 5 7 AMPLIFIER B AMPLIFIER A INPUT STAGE GENERATOR FLYBACK CIRCUIT GUARD IC901 3842 VCC GND O P Ct Rt Is COMP F B Vref 8 2 1 3 4 6 5 7 U V L O 36V 1V 1 2 Vref OSCILLATOR LATCH PWM...

Page 46: ...CO R HFL VFL SC I2 C BUS BUS ROM RAM FONT12 8 DISPLAY EFFECT VSYNC HSYNC VERTICA L CONTROL DISP L Y OUTPUT PLL TIMING GENERATOR CONTROL REG COLOR CONTROL TEST CIRCUI HORIZONTAL POWER SYSTEM PWM Cha nn...

Page 47: ...C717 R705 R704 Q704 R706 R702 R703 R701 R461 C454 D414 H601 C707 R462 C455 R954 R737 IC403 R437 SW901 Q412 R446 C429 R961 R189 R101 Q102 R927 Q425 D859 R191 C113 R102 R709 R708 R866 C407 C719 Q703 R7...

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