NEC MultiSync V720 Service Manual
  1. Manuals
  2. Brands
  3. NEC Manuals
  4. Monitor
  5. Diamand Scan 71
  6. Service manual

NEC MultiSync V720 Service Manual

N0701 series
Hide thumbs
Table of Contents

Advertisement

Quick Links

COLOR MONITOR

SERVICE MANUAL

MODELS
(Model No. N0701 Series)
/MITSUBISHI
NEC-MITSUBISHI ELECTRIC VISUAL SYSTEMS
MultiSync V720
MultiSync V721
Diamand Scan 71
Better Service
Better Reputation
Better Profit

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MultiSync V720 and is the answer not in the manual?

Questions and answers

Related Manuals for NEC MultiSync V720

Summary of Contents for NEC MultiSync V720

  • Page 1: Service Manual

    MODELS MultiSync V720 MultiSync V721 Diamand Scan 71 (Model No. N0701 Series) COLOR MONITOR SERVICE MANUAL Better Service Better Reputation Better Profit /MITSUBISHI NEC-MITSUBISHI ELECTRIC VISUAL SYSTEMS...
  • Page 2 W A R N I N G The SERVICE PERSONNEL should have the appropriate technical training knowledge and experience necessary to : ž Be familiar with specialized test equipment, and ž Be careful to follow all safety procedures associated with high voltage CRT circuit designs to minimize danger to themselves and their coworkers.

  • Page 3: Table Of Contents

    WRITE AND INSPECTION FOR PLUG AND PLAY COMMUNICATION ......28 TROUBLE SHOOTING ....................... 31 CIRCUIT DESCRIPTION ....................39 REPLACEMENT PARTS LIST .................... 73 1) MultiSync V720 Parts List ..................73 2) MultiSync V721 Different List ..................94 3) Diamond Scan 71 Different List ................. 96 BLOCK DIAGRAMS ......................98 SCHEMATIC DIAGRAMS ....................

  • Page 4: Precautions

    1 Precautions Follow these safety and servicing precautions to prevent damage and to protect against potential hazards such as electrical shock and X-rays. 1.1 Safety Precautions 1-1-1 Warnings 1. For safety purpose, do not attempt to modify the circuit board, and always disconnect the AC power before performing servicing on the monitor.
  • Page 5 c) Reverse the AC plug at the AC outlet and repeat the steps for AC voltage measurements for each exposed metal part. d) Voltage reading must not exceed 0.3 volts RMS, equivalent to 0.2 milliampere AC. Any value ex- ceeding this limits ill constitute a potential shock hazard and must be corrected immediately 1-1-3 Product Safety Notices Many electrical and mechanical parts in this chassis have special safety-related characteristics which are often not evident from visual inspection.

  • Page 6: Specifications

    832 × 624 @ 55 to 106 Hz vertical frequencies only 1024 × 768 @ 55 to 87 Hz … … NEC cites recommended resolution at 85 Hz for 1152 × 870 @ 55 to 77 Hz optimal display performance.

  • Page 7: Pin Adjustment Table

    PIN ASSIGNMENT PIN NO. Mini D-SUB-15P GREEN BLUE GROUND GROUND RED GROUND GREEN GROUND BLUE GROUND NO PIN GROUND GROUND H.SYNC. V.SYNC.

  • Page 8: Controls

    POWER SWITCH: Push/push to turn the monitor on and off. † Power input: To connect with the power cord. ‡ Signal input with the captive cable: To connect with personal computers’ analogue RGB output. MultiSync V720  ‚ƒ „ … † ‡...
  • Page 9 Diamand Scan 71  ‚ƒ „ … † ‡...

  • Page 10: On-Screen Manager(Osm)

    OSD OPERATION „P „P „P „P „P FUNCTION VALUE ADJUSTMENT If OSD off, press UP key to increase Contrast value, press DOWN key to decrease Contrast value. press SELECT key to display OSD and Brightness icon is active (Fig. 1) Fig.

  • Page 11: 3. Osd Color Select

    2. Color Temperature Select If selected icon is 9300/7500/6500/user color icon, press SELECT key to select Color Temperature for 9300, 7500, 6500 or user defined (Fig 4 – 7). Fig. 4 Fig. 5 Fig. 6 Fig. 7 3. OSD Color Select If OSD icon is selected, press SELECT key to change OSD color, there are three kinds of OSD color can be selected (Fig.
  • Page 12 4. SYNC OSD Display If EXIT icon is selected, press SELECT key to close OSD menu and then display sync information for 2 sec. This sync information will not be close until release SELECT key (Fig. 11). Fig. 11 5. Factory mode Press SELECT key + UP key and power on, system enter factory mode.
  • Page 13 Function explanation Brightness: Adjusts the overall image and background screen brightness. Contrast: Adjusts the image brightness in relation to the background. (Contrast control is also effective with “-, +” button even through OSM window is not existing.) Red Color Control: Adjust the red contrast of the display. Green Color Control: Adjust the green contrast of the display.
  • Page 14 Degauss: Select the degauss icon on “Icon select window” and push “SELECT” button. It will eliminate the stray magnetic field and correct the scan the electron beam, and will affect the purity, focus, convergence. Caution: Allow a minimum interval of 20 minutes to elapse between uses of the degauss function.

  • Page 15: Serial Number Information

    SERIAL NUMBER INFORMATION Refer to the serial number information shown below. Ex.) SERIAL NUMBER LABEL MODEL N0701 ∗∗∗∗∗∗∗∗∗ SERIAL No. Y 0 0 0 Manufactured Year : ( Last digit ) Manufactured Month : January to September 1 to 9 00001 ~ on ward October (Start from 00001 ~ when...

  • Page 16: Disassembly

    DISASSEMBLY Tilt / swivel base fixing, removing Fixing This product consists of the MultiSync monitor and the tilt / swivel base. When fixing the tilt / swivel base to the MultiSync monitor, please follow the steps below. • Push the six hooks of the tilt / swivel base into the six holes at the bottom of the MultiSync monitor.
  • Page 17 Cabinet Back 1.Turn the monitor CRT face down on a clean static Cabinet Back free surface to prevent scratching CRT face. 2.Remove the screw “b”. 3.Raise the signal cable vicinity of a cabinet back and lightly hit part (figure 1 reference) of a top of the cabinet back and remove the cabinet back.
  • Page 18 MAIN BOARD and CRT BOARD 1. Unsolder the GND wire from MAIN BOARD ASSY 2. Disconnect the connector “P201”, “P202”, “S204” and “S205” from the CRT BOARD ASSY. CRT BOARD ASSY 3. Disconnect the CRT BOARD ASSY from the CRT MAIN BOARD ASSY 4.

  • Page 19: Adjustment Procedures

    ADJUSTMENT SPECIFICATIONS TABLE OF CONTENTS Page (1) Adjustment & Inspection Tools ......................17 (2) Timing Table ............................17 (3) Definition for Normal Condition ......................17 (4) Hot Key Operation ..........................17 (5) B+ Adjustment ........................... 18 (6) X-ray Test ............................18 (7) H.

  • Page 20: Adjustment & Inspection Tools

    N0701 Adjustment Specifications Ver. 1.1 2000,10,27 (1) Adjustment & Inspection Tools: (A) Color Analyzer (B) Signal Generator CHAROMA 2135 (C) Multi Meter (D) Hi-Voltage Probe (E) Convergence Meter (F) Demagnetizer (G) Power Meter (H) Automatic Alignment System (I) DDC write & inspection system (2) TIMING TABLE(Factory Mode -20 MODES) M O D E R ES O LU T IO N...

  • Page 21: B+ Adjustment

    (5) B+ Adjustment (A) MODE: No. 12. (B) Pattern: Full white. (Brightness just cut off) (C) Adjust VR101 to make the cathode of D112 has 13.6V. (D) Check other power source should be 78 ¡Ó ¡Ó2V, 6.2V ¡Ó ¡Ó0.3V, 53.5V ¡Ó ¡Ó...

  • Page 22: (C) White Balance Adjustment (Factory Auto Adjustment)

    3. Adjust VR210, VR230 and VR250 to make X=283, Y=297, with readjusting VR301 (VR307 for Toshiba CRT) to keep the brightness between 1~1.5FL (3.4~5.1 cd/m2). (C) White Balance Adjustment (Factory Auto Adjustment) 1.9300K (Select the color Mode 9300K) 1) 50*50mm Green block Pattern, Brightness Control set to Max, Contrast Control set to Max, Adjust [G] gain control to Y=45FL.

  • Page 23: Power Saving Function Inspection

    (13) Power Saving Function Inspection (A) Mode: No. 12 (B) Pattern: Any Pattern (C) Inspection 1. It should be into power off Mode when the both horizontal sync and vertical sync are disable after 4 sec. Check the LED color “Orange” and the power consumption must be less then 5W.

  • Page 24: Timing Sheet

    (18) TIMING SHEET for N0501 / N0701 P re s e t M o d e N o . V G A 3 5 0 V G A 4 0 0 V G A 4 8 0 M A C II 8 0 0 *6 0 0 8 5 1 4 /A S ig n a l N a m e...
  • Page 25 P re s e t M o d e N o . 6 4 0 *4 8 0 E V G A 4 0 0 8 0 0 *6 0 0 6 4 0 *4 8 0 8 0 0 *6 0 0 1 0 *7 (6 0 ) S ig n a l N a m e (7 5 )
  • Page 26 P re s e t M o d e N o . M A C II 8 0 0 *6 0 0 1 0 *7 (7 0 ) 1 0 *7 (7 5 ) 1 2 *1 0 (6 0 ) S ig n a l N a m e 640*480 (4 9 .7 K )
  • Page 27 P re s e t M o d e N o . 1 0 2 4 *7 6 8 S ig n a l N a m e 800*600 (8 5 ) (100) 1 0 2 4 *7 6 8 R e s o lu tio n 800*600 9 4 .5...

  • Page 28: Distortion Adjustment

    Distortion Adjustment Factory Mode Setting *After completion of adjustment exit the factory mode and data will be saved. Signal : All signals Cross hatch Perform the adjust for signal No. 14 in step 6-1~3. Perform the adjust for above all signal in step 6-4,5. 1.
  • Page 29 4. Side Pincushion Adjustment (1) When OSM MENU is displayed, Select the “ “ icon. (2) Make sure that the side pincushion distortion meets the following standards. 1.5mm 1.8mm 1.8mm 1.8mm 1.8mm 1.8mm 1.8mm 1.5mm 5. Trapezoid Distortion Adjustment (1) When OSM MENU is displayed, Select the “ “...
  • Page 30 7. Purity (1) Receive signal 14(Cross hatch pattern). (2) The CRT face should be facing east and degauss the entire unit by external degaussing coil. (3) Make sure the single color purity. If not, readjust CPC magnet and touch up using correction magnets. 8.

  • Page 31: Write And Inspection For Plug And Play Communication

    Write and Inspection for Plug and Play Communication 1. C onstruction of System This system should be connected as shown below. Program Disk Monitor Signal Cable Fixture Power Cable Note: PC clock speed should be below 266MHz. OS is PC-DOS. Fixture Board can be connected directly to PC without Printer Cable.
  • Page 32 3. EDID DATA FILE MultiSync V720 EDID Serial No. Format Week of Manufacture (Month*4) Year of Manufacture Serial No Area 9bytes Check Sum MultiSync V721 EDID Serial No. Format Week of Manufacture (Month*4) Year of Manufacture A3 BC Serial No Area 9bytes Check Sum Diamand Scan 71 EDID Serial No.
  • Page 33 Bar Code Format(code39) Digit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 * N N N N N N N N _ Y M S Format Example * N B 7 0 0 9 1 T _ 0 Y 0 *+Set Assembly Code + 1 space + Serial No.

  • Page 34: Trouble Shooting

    TROUBLE SHOOTING Refer to User’s Manual trouble shooting section before using this chart. TABLE OF CONTENTS Page 1. NO OPERATION, POWER LED FLASH ..................32 2. NO OPERATION, POWER LED OFF ................... 33 3. VIDEO NOISE, OUT OF SYNC ..................... 34 4.

  • Page 35: No Operation, Power Led Flash

    1. NO OPERATION, POWER LED FLASH POWER LED FLASH POWER SW TURN OFF MULTIMETER TEST Q307, Q102 D110,D111,D112,D113 1. DC P/S O/P VOLTAGE SET AT 17V,CURRENT SET AT 600MA. POSITIVE CONNECT TO C130”+”. NEGATIVE CONNECT TO U105-pin 5. 2. SCOPE SET AT 10V/DIV, 10US/DIV, PROBE CHECK CONNECT TO Q102-GATE AND U103pin 5.

  • Page 36: No Operation, Power Led Off

    2. NO OPERATION, POWER LED OFF POWER SW TURN OFF CHECK F101 CHECK Q101 DC P/S O/P VOLTAGE SET AT 17V,CURRENT SET AT 200MA. POSITIVE CONNECT TO C112”+”. NEGATIVE CONNECT TO C105”-“. SCOPE SET AT 10V/DIV, 10US/DIV, PROBE CONNECT TO Q101-GATE AND C105”-“. CHECK U101 CHECK...

  • Page 37: Video Noise, Out Of Sync

    3. VIDEO NOISE, UNSYNCHRONOUS CHECK Q101 G-S FREQUENCY CHECK C114, R116 CHECK HORIZONTAL SYNCRONIZE D109, R115, R117 FREQUENCY C114 TO GND WITH H-SYNC CHECK Q102 G-S FREQUENCY CHECK HORIZONTAL CHECK C132, R139, SYNCRONIZE FREQUENCY C132 TO GND D115, R138, R140 WITH H-SYNC NORMAL OPERATION...

  • Page 38: No Video

    4. NO VIDEO NO VIDEO CHECK REFER TO SCREEN CONTROL “NO RASTER” CLOCKWISE ON PAGE CHECK TROUBLE IN U201 PIN 5, 8, 11 R/G/B SIGNAL, SIGNAL LEVEL SIGNAL CABLE CHECK PROBLEM IN U201 U201 PIN 18, 20, 23 CLAMP(PIN 15) SIGNAL LEVEL U201 12V VOLTAGE CHECK...

  • Page 39: No Raster

    5. NO RASTER NO RASTER POWER SUPPLY CHECK CHECK CHECK PROBLEM IN U301 PIN 3, U402 PIN 4 MCU U701 H/V SYNC CHECK PROBLEM IN U301 PIN 7, U402 PIN 23,24 U301, U402 H/V SYNC CHECK PROBLEM IN T301 PIN 3 VOLTAGE U102,Q102,D114,D111,L102 56V, 68V(AT H-FREQ.

  • Page 40: Trouble In H.v Sync

    6. TROUBLE IN H. V SYNC PROBLEM IN HOR. OR VER. SYNC CHECK PROBLEM IN CONNECTOR S702 (PIN3,4), SIGNAL SIGNAL CABLE CHECK PROBLEM IN U701(PIN 40,39) H/V SYNC LINE & H/V SYNC. Q301, Q401 SIGNAL CHECK CHECK PROBLEM IN U701(PIN 32,33) U701(PIN 5) 5V LINE H/V SYNC.

  • Page 41: Pincushion Poor

    7. POOR PINCUSHION POOR PINCUSHION CHECK Q314~Q316, PARABOLA D308 WAVE CHECK U402 PIN 9 CHECK C431, R432 PARABOLA CHECK U401 PIN 4 CHECK 12V & U402 SYNC INPUT CHECK U701 (PIN 32) OUTPUT...

  • Page 42: Circuit Description

    CIRCUIT DESCRIPTION TABLE OF CONTENTS Page 1. Power supply circuit ......................... 40 2. MCU ............................43 3. 2-wire serial CMOS EEPROM ....................56 4. Horizontal deflection signal processing ................... 57 5. Vertical compensation and geometrical compensation of the raster ........59 6.

  • Page 43: Power Supply Circuit

    Power supply circuit  Outline This power supply unit adopts the switching mode technology, and is an off-line mode type unit that provided several different DC outputs. The scanning frequency is available in different values ranging from 31 kHz to 69 kHz. Moreover, it is capable to operate at an AC input voltage of 100V ~ 240V and an ±...
  • Page 44 2) The power supply MOS FET Q101 carries out the ON/OFF operation of the control unit, by means of U101 KA3842A. KA3842A is a PWM (pulse width modulation) IC chip, with 16 V starting voltage and 10 V cut-off voltage. The following list shows the pin layout of KA3842A pulse width modulation IC chip.
  • Page 45 ‡ Power saving Suspend mode : Every DC voltage operation of the CRT is turned OFF. The color of the power LED101 switches from green to orange. OFF mode : This is the mode in which the CPU control unit turns OFF the power supply, but the power turns ON when the user touches the keyboard.

  • Page 46: Mcu

    Monitor MCU Specification Frequency Specification H-freq. : 29.5K – 70KHz V-freq. : 43 – 160Hz Judge polarity only when frequency is 31.5 KHz and 37.8 KHz Support composite sync detection System Architecture MCU – Weltrend WT6016, 16K bytes ROM size EEPROM –...
  • Page 47 3. Power saving – 2 pins (PMUS, PMUO) for power saving control – if Hf > 70KHz or Hf < 23KHz, enter power saving mode (suspend). – enter power saving mode after 3 sec when condition met. – enter suspend mode first for 3 sec before enter off mode if off mode condition met.
  • Page 48 IIC interface 1. DDC1/DDC2B – VESA DDC1/DDC2B is supported. 2. Auto alignment – I²C auto alignment protocol is supported. Timing Table Total 24 modes. 1. Factory mode – 20 modes ‘*’ indicate do not care. Mode Resolution H-sync. V-sync. H polarity V polarity VGA 350 31.5KHz 70Hz...
  • Page 49 Pin Definition Name Description Pin-balance PWM H Position PWM H size PWM Reset Low reset Ground Osc O 8MHz Crystal out Osc I Crystal in EEPROM/OSD SDA EEPROM/OSD SCL Test Pattern PMU OFF MUTE2 Degauss out MUTE1 PMU suspend Burn-in ID...
  • Page 50 GENERAL DESCRIPTION The WT6016 is a member of WT60XX microcontroller family. It is specially designed for digital con- trolled multi-sync monitor. It contains 8-bit CPU, 16K bytes ROM, 288 bytes RAM, 14 PWMs, parallel I/ O, SYNC processor, timer, one DDC interface (slave mode I²C interface with DDC1), one master/slave I²C interface, two 4-bit A/D converters and watch-dog timer.
  • Page 51 PIN DESCRIPTION Pin No. Pin Name Descriptions 40 42 D/A converter 2. Open-drain output. External applied voltage can up to 10V. D/A converter 1. Open-drain output. External applied voltage can up to 10V. D/A converter 0. Open-drain output. External applied voltage can up to 10V. /RESET Reset.
  • Page 52 SYNC Processor The SYNC processor can : (1) separate the composite sync signal; (2) calculate HSYNC and VSYNC frequencies; (3) detect polarities of HSYNC and VSYNC input; (4) control the output polarities of HSO and VSO pin; (5) generate free-running horizontal and vertical sync signals for burn-in test; (6) generate self-test pattern signal.
  • Page 53 Frequency Calculation Horizontal frequency and vertical frequencies calculation are done by using one 10-bit up counter. After power is on, the SYNC processor calculates the vertical frequency first (H/V bit = ”0”). A 31.25KHz clock counts the time interval between two VSYNC pulses, then sets the FRDY bit and generates an INT1 inter- rupt (if IEN_S bit is “1”).
  • Page 54 Test Pattern Generation A self-test pattern signal comes out from pin PB3/PAT. It can generate a cross hatch picture, a inverted cross hatch picture, a whit epicture or a black picture. 8 × 8 cross hatch Inverted 8 × 8 cross hatch White Picture Black Picture The test pattern signal is generated when SELF and ENPAT are both set to “1”.
  • Page 55 DDC Interface The DDC interface is a slave mode I²C interface with DDC1 function. It is fully compatible with VESA DDC1/2B standard. The functional block diagram is shown in the below. Internal Data Bus ENACK Data Buffer VSYNC Shift Register ADDR Address Compare START...
  • Page 56 If a low level occurs on the SCL pin in DDC state, the DDC interface will switch to DDC2B state immediately and set the DDC2B bit to “1”. No interrupt will be generated. But, if there is no valid device address and it receives 128 VSYNC pulses while the SCL is high level, it will lock into DDC2B state and disregard VSYNC.
  • Page 57 (5) Data bytes transmit/receive If the RW bit is “1”, the shift register will load data from the data buffer (REG#18H) before the data byte is transmitted and shift out data to the SDA pin before the rising edge of the SCL clock. If the RW bit is “0”, the shift register will shift in data on the rising edge of the SCL clock and the whole data byte is latched to the data buffer (REG#18H).
  • Page 58 Pull low SCL Pull low SCL Pull low SCL 0 0 0 0 0 Data Byte Data Byte Write REG#19H to release Shift register to data buffer INTO DDC2B=1 DDC2B=1 DDC2B=1 DDC2B=1 ADDR=0 ADDR=0 ADDR=0 ADDR=0 R/W=0 R/W=0 R/W=0 R/W=0 START=1 START=0 START=0...

  • Page 59: Wire Serial Cmos Eeprom

    3. 2-wire serial CMOS EEROPM Features Ÿ Low Voltage and Standard Voltage Operation 5.1 (Vcc = 4.5 V to 5.5 V) 3.0 (Vcc = 2.7 V to 5.5 V) 2.5 (Vcc = 2.5 V to 5.5 V) 2.0 (Vcc = 1.8 V to 5.5 V) Ÿ...

  • Page 60: Horizontal Deflection Signal Processing

    Horizontal deflection signal processing LM1290: 1. Full-automatic synchronization from 22 kHz to 90 kHz. No component changeover nor external adjustment is required. 2. DC control H phase and duty cycle. 3. The resistance corresponds to the frequency programmable down to VCO. 4.
  • Page 61 1. PIN 1. fmin: lower limit frequency of this setting. fmin = 5.6 × 10 / (Rmin*500) fmin = 29.1 kHz, Rmin = 18.7K Ω (When the frequency is 30kHz or more) fmin = 22.8 kHz, Rmin =24K Ω (When the frequency is 24kHz or more) 2.

  • Page 62: Vertical Compensation And Geometrical Compensation Of The Raster

    Vertical compensation and geometrical compensation of the raster LM1295: 1. Vertical scanning frequency : 50 to 100Hz. 2. DC control compensation amplitude 3. Temperature stability of the vertical amplitude : 1%. 4. Dynamic vertical deflection compensation corresponding to the secondary anode voltage drop. 5.
  • Page 63 1. V-Height (Pin-2): The amplitudes of the +V and –V drive currents are controlled by means of the 0V to 4V voltage of this pin. The current can be raised by raising by raising the voltage. The control range is approximately 1.8 to 2.
  • Page 64 11.Output of the parabola and bow-shaped parabola (Pin 14): The amplitude and the polarity of the ramp signal are controlled by means of the PARA CNTRL (Pin 12), and the amplitude and polarity of the parabola are controlled by the BOW CNTRL (PIN 13). In both cases, the control is carried out in the DC mode.

  • Page 65: Horizontal Drive And Power Supply Output

    Horizontal drive and power supply output Circuit Diagram Description of the circuit: 1) R1, T1 and Q2 compose the horizontal driving circuit, and the transistor Q1 generates a horizontal output through the driving signal. IB1 = I / Q1h CPMAX feMIN ¡Ü...

  • Page 66: Horizontal Amplitude Control

    Horizontal amplitude control Circuit Diagram H-Width AC PIN Description of the circuit: 1) The diodes D1 and D2 compose the bipolar modulation circuit, and have the function of controlling the currents of the oils DY(lpp) and Lm(lm) through voltage modulation carried out by utilizing VM. →...

  • Page 67: Blanking And Spot Killer

    Blanking and spot killer Circuit Diagram V-SYNC MUTE V-OUT BRIGHT CONTER Description of the circuit: 1) The vertical blanking circuit completes by Q1, Q2, Q3 and peripheral circuit. The vertical sync pulse applied to R3, R12 connected to Q5 base. Q5 is invert amplifier, then mixer with Q1 base together for compensate vertical retrace time of the blanking pulse.

  • Page 68: Video Amplifier System With On-Screen Display

    Video amplifier system with on-screen display LM1281 (U201) Outstanding features: * Three-channel video amplifier bandwidth 85 MHz @ -3 dB (4 Vp-p output) * OSD TTL input, bandwidth 50 MHz * High-speed video/OSD changeover * High impedance DC contrast control above the 0-4V, 40dB range * High impedance DC OSD contrast control above the 0-4V, 40dB range BLOCK AND CONNECTION DIAGRAM Red OSD Input...
  • Page 69 Test Circuits R21 47k = + 12V RED DRIVE ADJ. POT3 100K GREEN DRIVE ADJ. POT1 0.1 µ F 100 µ F 100K RED OSD INPUT BLUE DRIVE ADJ. POT2 0.1 µ F 100K GREEN OSD INPUT RGB CUTOFF ADJ. 0.1 µ...

  • Page 70: Monolithic Triple 13.5Ns Crt Driver

    10. Monolithic triple 13.5nS CRT driver...

  • Page 74: On Screen Display

    11. On Screen Display FEATURES • Horizontal sync input may be up to 100 kHz. • On-chip PLL circuitry up to 90MHz pixel rate for multi-sync operation. • Programmable horizontal resolutions up to 1524 dots per display row. • 538 bytes display registers to control full screen display. •...
  • Page 75 1.0 CONNECTION DIAGRAM (16 PINS PDIP 300 MIL PACKAGE) VSSA ROUT GOUT VDDA BOUT MTV016-N HFLB FBKG HTONE VFLB 2.0 PIN DESCRIPTIONS Name Pin# Function VSSA Analog ground. This ground pin is used to internal analog circuitry. Voltage Control Oscillator. This pin is used to control the internal oscillator frequency by DC voltage input from external low pass filter.

  • Page 76: Replacement Parts List

    Replacement Parts List B: Asia, C: China, L: LG, S: Samsung, T: Toshiba 1) MultiSync V720 Parts List ASSY CODE PART NO DESCRIPTION LOCATION Q'TY ALT REMARK 1 CABINET FRONT ASSY 10100581 CABINET FRONT 2 CABINET FRONT ASSY 11300351 PUSH BUTTON (CONTROL A)
  • Page 77 53 CRT BOARD A/I EJ044148 DIODE "T" 1N4148 D205 54 CRT BOARD A/I EJ044148 DIODE "T" 1N4148 D210 55 CRT BOARD A/I EJ044148 DIODE "T" 1N4148 D211 56 CRT BOARD A/I 80000451 DIODE/T 1/2W 1SS83 D212 57 CRT BOARD A/I 80000051 DIODE/T 1/2W 1SS82 D212...
  • Page 78 106 CRT BOARD A/I R0319110 JUMPER WIRE AI/T 7.5mm 107 CRT BOARD A/I R0319110 JUMPER WIRE AI/T 7.5mm 108 CRT BOARD A/I R0319110 JUMPER WIRE AI/T 7.5mm 109 CRT BOARD A/I R0319110 JUMPER WIRE AI/T 7.5mm 110 CRT BOARD A/I R0319110 JUMPER WIRE AI/T 7.5mm 111 CRT BOARD A/I...
  • Page 79 159 CRT BOARD A/I FA040112 CARBON 1/8W(T) 5% 1.1Kohm R284 160 CRT BOARD A/I FA240334 CARBON 1/4W(T) 5% 330Kohm R286 161 CRT BOARD A/I FA330101 CARBON 1/2W(T) 5% 100ohm R287 162 CRT BOARD A/I FA040103 CARBON 1/8W(T) 5% 10Kohm R288 163 CRT BOARD A/I FA040102 CARBON 1/8W(T) 5% 1Kohm...
  • Page 80 212 MAIN BOARD A/I GA322645 ELECT 85oC/T 22u/35V M C109 213 MAIN BOARD A/I GB747153 CERAMIC Y5P(B)/T 470P/50V K C110 214 MAIN BOARD A/I GE210352 PLASTIC PEI/T 0.01u/50V J C111 215 MAIN BOARD A/I GB910358 CERAMIC Z5V(F)/T 0.01u/50V Z C112 216 MAIN BOARD A/I GA310655 ELECT 85oC/T 10u/50V M C113...
  • Page 81 265 MAIN BOARD A/I GF210252 MEF CAP BOX 0.001u/50V J C315 266 MAIN BOARD A/I GF210262 MEF CAP BOX 0.001u/63V J C315 267 MAIN BOARD A/I GF247262 MEF CAP BOX 0.0047u/63V J C316 268 MAIN BOARD A/I GF247252 MEF CAP BOX 0.0047u/50V J C316 269 MAIN BOARD A/I GA347455 ELECT 85oC/T 0.47u/50V M...
  • Page 82 318 MAIN BOARD A/I GA422625 ELECT NP/T 22u/16V M C431 319 MAIN BOARD A/I GA310655 ELECT 85oC/T 10u/50V M C433 320 MAIN BOARD A/I GA310655 ELECT 85oC/T 10u/50V M C435 321 MAIN BOARD A/I GA310655 ELECT 85oC/T 10u/50V M C437 322 MAIN BOARD A/I GA310655 ELECT 85oC/T 10u/50V M C438...
  • Page 83 371 MAIN BOARD A/I EJ044148 DIODE "T" 1N4148 D306 372 MAIN BOARD A/I EJ044148 DIODE "T" 1N4148 D310 373 MAIN BOARD A/I EJ044148 DIODE "T" 1N4148 D311 374 MAIN BOARD A/I EJAC0018 DIODE/T 1A 1N4937 D312 375 MAIN BOARD A/I EJ044148 DIODE "T"...
  • Page 84 424 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 12.5mm J121 425 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 12.5mm J122 426 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 17.5mm J123 427 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 10mm J124 428 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 10mm...
  • Page 85 477 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 10mm 478 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 10mm 479 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 12.5mm 480 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 10mm 481 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 7.5mm 482 MAIN BOARD A/I...
  • Page 86 530 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 12.5mm 531 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 12.5mm 532 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 12.5mm 533 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 7.5mm 534 MAIN BOARD A/I R0319110 JUMPER WIRE AI/T 7.5mm 535 MAIN BOARD A/I...
  • Page 87 583 MAIN BOARD A/I EAA09456 TR NPN 2SC945P TO-92(T) (N.P.S.) Q603 584 MAIN BOARD A/I EBA10157 TR PNP 2SA1015GR TO-92(T) (T.P.S.) Q604 585 MAIN BOARD A/I EBA07336 TR PNP 2SA733P TO-92(T) (N.P.S.) Q604 586 MAIN BOARD A/I EAA18157 TR NPN 2SC1815GR TO-92(T) (T.P.S.) Q605 587 MAIN BOARD A/I EAA09456 TR NPN 2SC945P TO-92(T) (N.P.S.)
  • Page 88 636 MAIN BOARD A/I FB240470 METAL 1/4W(T) 1% 47ohm R158 637 MAIN BOARD A/I FA040105 CARBON 1/8W(T) 5% 1Mohm R159 638 MAIN BOARD A/I FA040202 CARBON 1/8W(T) 5% 2Kohm R160 639 MAIN BOARD A/I FA040103 CARBON 1/8W(T) 5% 10Kohm R161 640 MAIN BOARD A/I 80000561 BEAD 3.5x6x0.8/T...
  • Page 89 689 MAIN BOARD A/I FA040103 CARBON 1/8W(T) 5% 10Kohm R345 690 MAIN BOARD A/I FB241301 METAL 1/4W(T) 1% 1.3Kohm R346 691 MAIN BOARD A/I FB242801 METAL 1/4W(T) 1% 2.8Kohm R347 692 MAIN BOARD A/I FB242871 METAL 1/4W(T) 1% 2.87Kohm R347 693 MAIN BOARD A/I FA330913 CARBON 1/2W(T) 5% 91Kohm...
  • Page 90 742 MAIN BOARD A/I FA040473 CARBON 1/8W(T) 5% 47Kohm R407 743 MAIN BOARD A/I FA040471 CARBON 1/8W(T) 5% 470ohm R408 744 MAIN BOARD A/I FA040473 CARBON 1/8W(T) 5% 47Kohm R409 745 MAIN BOARD A/I FA040471 CARBON 1/8W(T) 5% 470ohm R40A 746 MAIN BOARD A/I FB246801 METAL 1/4W(T) 1% 6.8Kohm R410...
  • Page 91 795 MAIN BOARD A/I FA040472 CARBON 1/8W(T) 5% 4.7Kohm R710 796 MAIN BOARD A/I FA040472 CARBON 1/8W(T) 5% 4.7Kohm R713 797 MAIN BOARD A/I FA040102 CARBON 1/8W(T) 5% 1Kohm R714 798 MAIN BOARD A/I FA040472 CARBON 1/8W(T) 5% 4.7Kohm R715 799 MAIN BOARD A/I FA040472 CARBON 1/8W(T) 5% 4.7Kohm...
  • Page 92 848 MAIN BOARD INSERT GJ047405 SAFETY X-CAP 0.47u/275V M(PHILIPS) C101 849 MAIN BOARD INSERT GJ047407 SAFETY X-CAP 0.47u/275V M(OKAYA) C101 850 MAIN BOARD INSERT GJ047409 SAFETY X-CAP 0.47u/250V M(PILKOR) C101 851 MAIN BOARD INSERT GJ04740A SAFETY X-CAP 0.47u/275V M(EPCOS B81130) C101 852 MAIN BOARD INSERT GJH102E5 SAFETY Y-CAP/S 1000P/400V M...
  • Page 93 901 MAIN BOARD INSERT 14000071 SCREW (PL-CPTS*3*8*15BF) FOR FBT 902 MAIN BOARD INSERT R0180028 FUSE HOLDER 5X20mm FOR FUSE 903 MAIN BOARD INSERT 80010631 JUMPER 2.54mm FOR SW301 904 MAIN BOARD INSERT 80000781 SINGLE PIN L=12.0 D=1.5 FOR TH101 905 MAIN BOARD INSERT JD010040 IC SOCKET 40P FOR U701...
  • Page 94 954 MAIN BOARD INSERT 80002031 FUSEABLE RES 1/2W(A)M 0.22ohm R150 955 MAIN BOARD INSERT 80002031 FUSEABLE RES 1/2W(A)M 0.22ohm R175 956 MAIN BOARD INSERT 80011181 FUSEABLE RES 1/2W(A)M 22ohm R304 957 MAIN BOARD INSERT FB710150 MOF 3W/M(A) 5% 15ohm R309 958 MAIN BOARD INSERT FB560010 MOF 2W/M(A) 5% 1ohm R311...
  • Page 95 VR CARBON 6mm ª× 1K 1007 MAIN BOARD INSERT FF310102 VR102 VR CARBON 6mm ª× 50Kohm M 1008 MAIN BOARD INSERT FF310503 VR301 VR CARBON 6mm ¥ß 10K VZ067TH1 1009 MAIN BOARD INSERT FF300103 VR306 VR CARBON 6mm ª× 200K 1010 MAIN BOARD INSERT FF310204 VR307...
  • Page 96 1060 SET ASSY 17000321 CABLE TIES(GT-100M) 1061 SET ASSY 10100572 CABINET FRONT ASSY 1062 SET ASSY 10100594 CABINET BACK 1063 SET ASSY 12000281 BRACKET(PCB) 1064 SET ASSY 15200471 LABEL WARNING (27.5KV/600uA) 1065 SET ASSY 12000551 BRACKET(CABLE) 1066 SET ASSY 12300202 PLATE SHIELDING (VIDEO) 1067 SET ASSY 15000841...

  • Page 97: Multisync V721 Different List

    2) MultiSync V721 Different List B: Asia, R: Australia, L: LG, T: Toshiba, S: Samsung ASSY CODE PART NO DESCRIPTION LOCATION Q'TY ALT REMARK 1 CABINET FRONT ASSY 10101111 CABINET FRONT(PC+ABS) 2 CABINET FRONT ASSY 11300351 PUSH BUTTON (CONTROL A) 3 CABINET FRONT ASSY 11300781 PUSH BUTTON (SW)
  • Page 98 53 SET ASSY 80000031 GND WIRE 18AWG L=130mm GND WIRE 54 SET ASSY 80000891 WIRE L=360mm BLACK AWG18 GND WIRE 55 SET ASSY 80001931 17" ROTATION COIL GND WIRE 56 SET ASSY 80010951 MS75 CRT GND WIRE GND WIRE 57 SET ASSY 72000641 TCO PCB PCB TCO...

  • Page 99: Diamond Scan 71 Different List

    3) Diamond Scan Different List ASSY CODE PART NO DESCRIPTION LOCATION Q'TY ALT REMARK 1 CABINET FRONT ASSY 10100741 CABINET FRONT(PC+ABS) 2 CABINET FRONT ASSY 11300481 PUSH BUTTON (CONTROL) 3 CABINET FRONT ASSY 11300491 PUSH BUTTON (SW) 4 CABINET FRONT ASSY 11600181 LENS 5 CABINET FRONT ASSY...
  • Page 100 53 SET ASSY 15200031 LABEL (REV.) 54 SET ASSY 15000951 NAME PLATE INSTRUCTION DS71(B) 55 SET ASSY 15200471 LABEL WARNING (27.5KV/600uA) 56 SET ASSY 12000281 BRACKET(PCB) 57 SET ASSY 12000551 BRACKET(CABLE) 58 SET ASSY 12300202 PLATE SHIELDING (VIDEO) 59 SET ASSY 17000301 CUSHION PIECE (BACK) 60 SET ASSY...

  • Page 101: Block Diagrams

    N0701 (V720/V721/DS71) HORIZONTAL AND VERTICAL KA3842 SYNC PROCESSOR S M P S LM1290+LM1295 EH.T. SYSTEM ARCHITECTURE H/HV EW-OUT & HOUT / V.GEOMETRY MCU/E²ROM/DDC DYNAMIC VERT OUT FOCUSING TDA 4866 RGB OUT WT6016+24C04 LM2438 KA3843 DEFLECT-STAGE CUT-OFF I²C MOTHER BOARD R G B CUT-OFF RGB PREAMP MTV-016...

  • Page 102: Schematic Diagrams

    SCHEMATIC DIAGRAMS 1) Video Board...

  • Page 103: Main Board

    2) Main Board...

This manual is also suitable for:

Multisync v721N0701 seriesDiamand scan 71

Table of Contents