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SERVICE
LCD Monitor
LCD-Monitor
Model
920NW
Manual
Fashion Feature
- 19" LCD Monitor (1440x 900 )
- Response Time (5ms)
- Simple Stand
- Silver / Black ColorVariation

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Table of Contents

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   Summary of Contents for Samsung 920NW - SyncMaster - 19" LCD Monitor

  • Page 1: Service Manual

    LCD-Monitor Model 920NW SERVICE Manual LCD Monitor Fashion Feature - 19" LCD Monitor (1440x 900 ) - Response Time (5ms) - Simple Stand - Silver / Black ColorVariation...
  • Page 2 Copyright Trademarks Samsung is the registered trademark of Samsung ©2007 by Samsung Electronics Co., Ltd. Electronics Co., Ltd. All rights reserved. 920NW and MacMaster Cable Adapter are trademarks This manual may not, in whole or in part, be copied, of Samsung Electronics Co., Ltd.
  • Page 3: Table Of Contents

    Contents . Precautions ………………………………………………………………………………………………………………………………………1 1-1 Safety Precautions ……………………………………………………………………………………………………………………… 1-1 1-2 Servicing Precautions …………………………………………………………………………………………………………………… 1-2 1-3 Electrostatically Sensitive Devices (ESD) Precautions ……………………………………………………………………………… 1-2 1-4 Installation Precautions ………………………………………………………………………………………………………………… 1-3 . Product specifications …………………………………………………………………………………………………………………………2 2-1 Fashion Feature…………………………………………………………………………………………………………………………… 2-1 2-2 Specifications ……………………………………………………………………………………………………………………………… 2-1 2-3 Option Specification ……………………………………………………………………………………………………………………… 2-2 .
  • Page 4 Contents . Schematic Diagrams ……………………………………………………………………………………………………………………………9 9-1 INPUT ……………………………………………………………………………………………………………………………………… 9-1 9-2 DCINPUT ……………………………………………………………………………………………………………………………………9-2 9-3 SCALER ……………………………………………………………………………………………………………………………………9-3 9-4 POWER ……………………………………………………………………………………………………………………………………9-4 9-5 POWER ……………………………………………………………………………………………………………………………………9-5 9-6 KEYPAD ……………………………………………………………………………………………………………………………………9-6 1 1 0. Operating Instructions and Installation … … …………………………………………………………………………………………………10-1 10-1 Front …………………………………………………………………………………………………………………………………… 10-1 10-2 Rear ………………………………………………………………………………………………………………………………………10-2 10-3 Monitor Assembly ………………………………………………………………………………………………………………………10-3 10-4 Attaching a Base ………………………………………………………………………………………………………………………10-4 1 1 1.
  • Page 5 Samsung Electronics Co.,Ltd. -This Service Manual is a property of Samsung 416, Maetan-3Dong, Yeongtong-Gu, Suwon City, Electronics Co., Ltd. Gyeonggi-Do, Korea, 443-742 Any unauthorized use of Manual can be punished Printed in Korea under applicable International and/or domestic P/N : BN82- law.
  • Page 6: Precautions

    1 Precautions 1 Precautions Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as electrical shock. 1-1 Safety Precautions 1-1-1 Warnings For continued safety, do not attempt to modify the circuit board. Disconnect the AC power and DC power jack before servicing.
  • Page 7: Servicing Precautions

    1 Precautions 1-2 Servicing Precautions WARNING: An electrolytic capacitor installed with the wrong polarity might explode. Caution: Before servicing units covered by this service manual, read and follow the Safety Precautions section of this manual. Note: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions, always follow the safety precautions.
  • Page 8: Installation Precautions

    1 Precautions 1-4 Installation Precautions 1. For safety reasons, more than two people are 6. Keep the antenna far away from any high-voltage required for carrying the product. cables and install it firmly. Contact with the highvoltage cable or the antenna falling over may 2.
  • Page 9 1 Precautions Memo...
  • Page 10: Product Specifications

    2 Product Specifications 2 Product Specifications 2-1 Fashion Feature - 19" LCD Monitor (1440x 900 ) - Response Time (5ms) - Simple Stand - Silver / Black ColorVariation 2-2 Specifications Features Specifications Size 19" Diagonal (41 x 27cm) Pixel Pinch 0.285(H) x 0.285(V) Frequency Horizontal / Vertical...
  • Page 11: Option Specification

    2 Product Specifications 2-3 Option Specification Item Item Name CODE.NO Remark GUIDE, QUICK SETUP BH68-00376L-04 MNL User's(CD) BN59-00537A-00 CARS, WARRANTY BH68-70438A-10 D-Sub Cable...
  • Page 12: Alignments And Adjustments

    3 Alignments and Adjustments 3 Alignments and Adjustments This section of the service manual explains how to use the RS232 JIG. This function is needed for AD board change. 3-1 Required Equipment The following equipment is necessary for adjusting the monitor: Computer with Windows 95, Windows 98, Windows NT, Windows 2000, or Windows XP.
  • Page 13 3 Alignments and Adjustments 3-4 VGA EDID table Details: Byte(Hex) Field Name and Comments Description EDID 00-07(8 byte) Head Information 00,FF,FF,FF, FF, FF, FF,00 08--09 ID Manufacturer Name 4C,2D 0A--0B Product ID Code 022B 2B,02 0C--0F Last 5 Digits of Serial Number Used Notes1 XX,XX,XX,XX Week of Manufacture...
  • Page 14 3 Alignments and Adjustments Byte(Hex) Field Name and Comments Description EDID Established Timing II 800x600@72Hz 800x600@75Hz 832x624@75Hz 1024x768@87Hz (no) 1024x768@60Hz 1024x768@70Hz 1024x768@75Hz 1280x1024@75Hz Manufacturers Reserved Timings Support 26-35 (16 byte) Standard Timing Identification 1280x1024@60Hz81,8071,4F 81,80 1152x864@75Hz 81,40 1280x960@60Hz 01,01 Not Used 01,01 Not Used 01,01...
  • Page 15: How To Execute Ddc

    3 Alignments and Adjustments 3-5 How to execute DDC 1. Install Analog DVI EDID Tool Program 2. Click the Analog DVI EDID Tool icon. 3. Select mode The password is 1234. Select the manufacture is Venus and the model name is Venus 17. 4.Setting The password is 1234.
  • Page 16: How To Execute Mcu Code

    3 Alignments and Adjustments 6. Write DDC ok. 3-5 How to execute MCU Code 1. Set the options. -. Manufacture: MSTAR -. Device Type: TSUM16_ROM128K_ext_flash -. Communication Port: DSUB15 (Analog) -. External Memory: PM25LV010E 2. Click 'Connect File' button, and select the MCU code.
  • Page 17 3 Alignments and Adjustments 4. Click 'Auto Program' button. 5. If Program and Verify is OK, turn off the hard power and than turn on again.
  • Page 18: Troubleshooting

    4 Troubleshooting 4 Troubleshooting 4-1 Common Acknowledge - If you change the interface board, be sure that the U105, U106 and U103 these three components also changed to the new I/F board because there was program inside. If not, please re-write EDID or upload firmware into Flash memory via VGA Cable.
  • Page 19: No Power & Power Led Off

    4 Troubleshooting 4-2 No Power & Power LED Off No power Check primary Check IC802, Check circuit if rectifier voltage C805, T801 short Check F801, P801, RT,801,D801 Check pin6 of Check C810,D803,C807 IC802 voltage about 12V Check pin2 of Check primary OVP, OLP IC802 voltage and secondary feedback, about 3V...
  • Page 20: Output Power Is Unstable

    4 Troubleshooting 4-3 Output power is unstable Unstable power Check sampling Check R822, R823, Circuit R824 Change R822, R823, R824 Check the C pin Check the R pin voltage of IC803 if Change IC803 voltage of IC803 about 2.5V Check R819, R820 Check pin1 of Check R818, D804, IC802 voltage is...
  • Page 21: Backlight Can't Be Turned On

    4 Troubleshooting 4-4 Backlight can't be turned on No backlight No power supply to Check the cable that from LED lamp is OK inverter I/F BD to P/I BD is ok Is there 14V voltage on pin 3,4 U501, U502 fail Check power supply of T501, T502 Replace U501, U502...
  • Page 22: Black Screen And Backlight Turn On

    4 Troubleshooting 4-5 Black Screen and backlight turn on Black Screen Check power supply: Pin1, 2 of Power Fail CN102 Check pin34, 51, 66, and 82 Of Check FB103 And U102 U105 Check pin12, 68, 97 and 117 Of Check FB105 And U106 U103 Check Reset Check C149, R157...
  • Page 23: White Screen

    4 Troubleshooting 4-6 White Screen White Screen LVDS Cable Workmanship Reinsert Change LVDS LVDS Cable NG Cable Check VLCD Is Check LVDS Panel Fail Signals Check Panel Check the HW Enable Of U103 Reset Of U103 Check C149 R157 (pin75) is High? pin19 Check R134, R176, Q102, Q105...
  • Page 24: Bad Screen

    4 Troubleshooting 4-8 Bad Screen Bad Screen LVDS Cable Workmanship Reinsert Change LVDS LVDS Cable NG Cable Check Crystal:Pin32, Check :X1, C147, C148 Pin33 of U103 Check the Check: SDO, SCZ, SCK, communication Of SDI, Reset U103 and U104 Check the pins of U103 and U104...
  • Page 25 4 Troubleshooting Memo...
  • Page 26: Exploded View And Parts List

    6 Exploded View & Parts List 5 Exploded View and Parts List -You can search for updated part codes through ITSELF web site. URL : http://itself. sec. samsung.co.kr 5-1 Exploded View M0215 7140200053 7140100097...
  • Page 27 5 Exploded View & Parts List 5-1-1 LS19HANKSM/EDC Parts List Location.No CODE-NO SPECIFICATION & DESCRIPTION Q'TY SA/SNA REMARK M0215 BN07-00406A LCD-PANEL;MT190AWO1 V2,Haydn,6bit FRC,42 7140200053 BN82-00152A A/S MATERIAL ASSY-BASE;LE1729 7140100097 BN82-00188B A/S MATERIAL ASSY-STAND;LE1961...
  • Page 28: Electrical Parts List

    6 Electrical Parts List 6 Electrical Parts List You can search for updated part codes through ITSELF web site. URL : http://itself.sec.samsung.co.kr/ 6-1 LS19HANKSM/EDC Parts List Level Loc. No. Code No. Description & Specification Q'ty SA/SNA LS19HANKSM/EDC 920NW SILVER, TCO99...
  • Page 29 6 Electrical Parts List Memo...
  • Page 30: B B Lock Diagram

    7 Block Diagrams 7 Block Diagram 7-1 Power tree...
  • Page 31: Mainboard Part

    7 Block Diagrams 7-2 Main Board part 7-3 IP Board Part (Power part)
  • Page 32: Ip Board Part(inverter Part)

    7 Block Diagrams 7-4 IP BOARD part(Inverter Part) Vin voltage (+14.2V) DC to DC CCFL1 (+14.2V to 5.0V) Transformer T501 CCFL2 Brightness MosFET control signal U501 CCFL PWM Control IC IC501 MosFET ON/OFF U502 CCFL1 Transformer T502 CCFL2 Voltage feedback Current feedback...
  • Page 33 7 Block Diagrams Memo...
  • Page 34: Wiring Diagram

    8 Wiring Diagram 8 Block Diagram...
  • Page 35 8 Wiring Diagram Memo...
  • Page 36: Schematic Diagrams

    9 Schematic Diagrams 9 Schematic Diagrams - This Document can not be used without Samsung s authorization. 9-1 INPUT...
  • Page 37: Dcinput

    9 Schematic Diagrams 9-2 DCINPUT...
  • Page 38: Scaler

    9 Schematic Diagrams 9-3 SCALER...
  • Page 39: Power

    9 Schematic Diagrams 9-4 POWER...
  • Page 40 9 Schematic Diagrams 9-5 POWER...
  • Page 41: Keypad

    9 Schematic Diagrams 9-6 KEYPAD...
  • Page 42: 1 0. Operating Instructions And Installation

    10 Operating Instructions and Installation 10 Operating Instructions and Installation 10-1 Front 1. Menu button 3) Internet : Medium brightness Opens the OSD menu. Also use to exit the OSD For working with a mixture of images such as text menu or return to the previous menu.
  • Page 43: Rear

    10 Operating Instructions and Installation 10-2 Rear 1. Power port Connect the power cord for your monitor to the power port on the back of the monitor. 2. D-sub 15-pin port Connect the signal cable to the 15-pin, D-sub connector on the back of your monitor. 3.
  • Page 44 10 Operating Instructions and Installation 10-3 Connecting the monitor Connect the power cord for your monitor to the power port on the back of the monitor. Plug the power cord for the monitor into a nearby outlet. 2-1. Using the D-sub (Analog) connector on the video card. Connect the signal cable to the 15-pin, D-sub connector on the back of your monitor.
  • Page 45: Monitor Assembly

    10 Operating Instructions and Installation 10-4 Monitor Assembly 10-4...
  • Page 46: Attaching A Base

    10 Operating Instructions and Installation 10-5 Attaching a Base A. Monitor B. Mounting interface pad 1. Turn off your monitor and unplug its power cord. 2. Lay the LCD monitor face-down on a flat surface with a cushion beneath it to protect the screen. 3.
  • Page 47 10 Operating Instructions and Installation Memo 10-6...
  • Page 48: Disassembly Block

    11 Disassembly and Reassembly 11 Disassembly and Reassembly 11-1 Disassembly Block LE 1729 LCD Monitor STAND_REAR*1 HINGE *1 SCREW M4*10 *3 ASSY, BASE BASE*1 ASSY STAND STAND_FRONT *1 RUBBER FOOT *6 SCREW M4*10 *4 SCREW.P.CROSS,T.T-4*8,Zn BACK COVER BKT-VESA *4 LENS*1 BEZEL*1 ASSY FRONT BEZEL CONTROL BOARD*1...
  • Page 49 11 Disassembly and Reassembly Description Picture Description 1. Remove 4 screw from the stand 2. Remove the stand and front coler 11-2...
  • Page 50 11 Disassembly and Reassembly Description Picture Description 3. Lift the back cover and use the jig to remove the shield lamp. 4. Disconnect cables 5. Lift up the shield and disconnect LVDS cables 11-3...
  • Page 51: Reassembly

    11 Disassembly and Reassembly 설 설 명 사 사 진 설명 Description Picture Description 6. Lift up the LCD panel 11-2 Reassembly Reassembly procedures are in the reverse order of disassembly procedures. 11-4...
  • Page 52: Pcb Diagram

    12 PCB Diagram 12 PCB Diagram 12-1 Main Board 12-1-1 Main Board Top Layer 12-1-2 Main Board Bottom Layer 12-1...
  • Page 53 12 PCB Diagram Memo 12-2...
  • Page 54: C C Ircuit Descriptions

    13 Circuit Descriptions 13 Circuit Descriptions 13-1 Overall Block Structure 13-1-1 Power Tree 1. When the AD board is in DPMS state: 1.1 The IP has been designed so that it operates with a power consumption of less than 0.6W of. 1.2 The Scaler consumes power up to 37mA 1.3 The power to the panel is switched off 2.
  • Page 55 13 Circuit Descriptions 13-1-2 Main board Parts 1. Inverter: A conversion device that converts DC 6. Scaler & EEPROM: I2C is a two-way serial bus rated voltage/current to high ones necessary for of two lines that supports communications across the panel lamp. the integrated circuits as well as between FLASH and EEPROM.
  • Page 56 13 Circuit Descriptions 13-1-3 IP Board Part(Power) Schematic Diagrams 13-3...
  • Page 57: Ip Board Part(inverter Part)

    13 Circuit Descriptions 13-3 IP BOARD part(Inverter Part) Vin voltage (+14.2V) DC to DC CCFL1 (+14.2V to 5.0V) Transformer T501 CCFL2 Brightness MosFET control signal U501 CCFL PWM Control IC IC501 MosFET ON/OFF U502 CCFL1 Transformer T502 CCFL2 Voltage feedback Current feedback 13-4...
  • Page 58: Reference Infomation

    14 Reference Infomation 14 Reference Infomation 14-1 Technical Terms -TFT-LCD -FINE Thin film Transistor Liquid Crystal Display The "Fine" adjustment is used to adjust visibility by controlling phase difference. -ADC(Analog to Digital Converter) This is a circuit that converts from analog signal to -COARSE digital signals.
  • Page 59 14 Reference Infomation -Interlace and Non-Interlace Methods Showing the horizontal lines of the screen from the top to the bottom in order is called the Non- Interlace method while showing odd lines and then even lines in turn is called the Interlace method. The Non- Interlace method is used for the majority of monitors to ensure a clear image.
  • Page 60: Pin Assignments

    14 Reference Infomation 14-2 Pin Assignments Sync 15-Pin D-Sub Signal Cable Connector Type Separate Sync-on-green Pin No. Green Green + H/V Sync. Blue Blue DDC Return (GND) DDC Return (GND) GND-R GND-R GND-G GND-G GND-B GND-B Cable Detect Cable Detect Bi-Dr Data (SDA) Bi-Dr Data (SDA) H-Sync.
  • Page 61: Timing Chart

    14 Reference Infomation 14-3 Timing Chart - This section of the service manual describes the timing that the computer industry recognizes as standard for computer-generated video signals. Table 1 Timing Chart dot_clk h_freq v_freq Timing ID Name (MHz) (kHz) (Hz) IBM 640*350/70Hz 640*350/70Hz 25.175...
  • Page 62: Preset Timing Modes

    14 Reference Infomation 14-4 Preset Timing Modes - If the signal transferred from the computer is the same as the following Preset Timing Modes, the screen will be adjusted automatically. However, if the signal differs, the screen may go blank while the power LED is on.
  • Page 63: Panel Description

    14 Reference Infomation 14-5 Panel Description Maker VENDOR P/N PANEL_CODE PANEL_ABB STICKER_CODE Remarks 631102071830r LCD PANEL 17" MT170EN01 631102070680r LCS PANEL 17" CLAA170EA07Q(CPT) 14-6...

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