Samsung 720N Service Manual
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Samsung 720N Service Manual

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SERVICE
LCD Monitor
LCD-Monitor
Model
720N
Manual
Fashion Feature
- SXGA Display (1280 x1024)
-Response Time: 8ms
-Connectivity: Analog (15P D-sub)
-Power Consumption: 17''(34W)
-DPMS: under 1W (230Vac)

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Summary of Contents for Samsung 720N

  • Page 1 LCD-Monitor Model 720N SERVICE Manual LCD Monitor Fashion Feature - SXGA Display (1280 x1024) -Response Time: 8ms -Connectivity: Analog (15P D-sub) -Power Consumption: 17''(34W) -DPMS: under 1W (230Vac)
  • Page 2 Samsung Electronics Co.,Ltd. -This Service Manual is a property of Samsung Electronics Co., Ltd. 416, Maetan-3Dong, Yeongtong-Gu, Suwon City, Any unauthorized use of Manual can be punished Gyeonggi-Do, Korea, 443-742 under applicable International and/or domestic law. Printed in Korea...

  • Page 3: Safety 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 4: General 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 5: 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 6 1 Precautions Memo...

  • Page 7: 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 8: How To Execute Ddc

    3 Alignments and Adjustments 3-4 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 9: 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 10 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 11: 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 12: 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, D801 Check pin3 of Check R801, R805, IC802 voltage R822, R823, R817 about 1V Check pin2 of Check R803, R807, IC802 voltage...
  • Page 13 4 Troubleshooting 4-3 DC output voltage is unstable Output Voltage Unstable Check Vbe of Check ZD801, ZD802, Check circuit if Q801 below ZD803, D803, D805 short Check Q801, Q802 Check pins of Check R801, R805, Check reference IC801 R822, R823, R817 voltage Check R810, R811 Check feedback...

  • Page 14: Output Power Is Unstable

    4 Troubleshooting 4-4 Output power is unstable Unstable power Check sampling Check R810, R811, Circuit R818 Change R810, R811, R818 Check the C pin Check the R pin voltage of IC803 if Change IC803 voltage of IC803 about 2.5V Check R809, R808, R814, D809 Check pin1 of Check D806, C815...

  • Page 15: Backlight Can't Be Turned On

    4 Troubleshooting 4-5 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 16: Black Screen And Backlight Turn On

    4 Troubleshooting 4-6 Black Screen and backlight turn on Black Screen Check power supply: Pin1, 2 of Power Fail CN101 Check pin34, 51, 66, and 82 Of Check FB103 And U102 U105 Check pin32, 49, 56, and 75 Of Check FB106 And U101 U105 Check Reset Check C144, R172...

  • Page 17: White Screen

    4 Troubleshooting 4-7 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 U105 Reset Of U105 Check C144 R172 (pin48) is High? pin84 Check R168, R105, Q103, Q101...

  • Page 18: Bad Screen

    4 Troubleshooting 4-8 Bad Screen Bad Screen LVDS Cable Workmanship Reinsert Change LVDS LVDS Cable NG Cable Check Check :X101, C153, Crystal:Pin96,97 Of C154 U105 Check the Check: SDO, SCZ, SCK, communication Of SDI, Reset U105 and U106 Check the pins of U105 and U106...
  • Page 19 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 Viewand Parts List...
  • Page 20 5 Exploded View & Parts List Memo...

  • Page 21: 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 Main PCB Parts Loc. No. Code No. Description & Specification Q'ty SA/SNA B7143 BN82-00161A ASSY,BEZEL(S), LE1729 B790E BN82-00166A ASSY,PCB&RIVENT,LE1729...
  • Page 22 6 Electrical Parts List Loc. No. Code No. Description & Specification Q'ty SA/SNA B453B BN81-00270A CABLE,D-SUB 15P MALE 6FT BLACK/BLUE,RoHS B5050 BN81-00282A INSULATOR,MYLAR,20x15x15mm, LE1730 B7030 BN81-00283A KIT,ACCESSORY, LE1729 B4100 BN81-00384A XSTR PMBT3906 PNP 200MA,40V SOT23(PHILIP B4100 BN81-00385A XSTR SN7002N N-CH SOT-23(INFINEON),RoHS B4100 BN81-00386A XSTR SSM9971GM DUAL N-CH,SO8(SILICON)RoH...

  • Page 23: Block Diagram

    7 Block Diagrams 7 Block Diagram 7-1 Power tree...

  • Page 24: Mainboard Part

    7 Block Diagrams 7-2 Mainboard part 7-3 IP Board Part(SMPS Part)

  • Page 25: 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 26 7 Block Diagrams Memo...
  • Page 27 8 Wiring Diagram 8 Block Diagram...
  • Page 28 8 Wiring Diagram Memo...
  • Page 29 9 Schematic Diagrams 9 Schematic Diagrams - This Document can not be used without Samsung s authorization. 9-1 DC-DC...
  • Page 30 9 Schematic Diagrams 9-2 INPUT...
  • Page 31 9 Schematic Diagrams 9-3 TSUM16AL...
  • Page 32 9 Schematic Diagrams 9-4 POWER...
  • Page 33 9 Schematic Diagrams 9-5 INVERTER...
  • Page 34 9 Schematic Diagrams 9-6 KEYPAD...
  • Page 35 10 Operating Instructions and Installation 10 Operating Instructions and Installation 10-1 Front 1. Menu button Opens the OSD menu. Also use to exit the OSD 3) Internet : Medium brightness menu or return to the previous menu. For working with a mixture of images such as text and graphics.
  • Page 36 10 Operating Instructions and Installation 6. Power button / Power indicator Use this button for turn the monitor on and off. /This light glows green during nomal operation, and blinks green once as the monitor saves your adjustments.. 10-2 Rear 1.

  • Page 37: Monitor Assembly

    10 Operating Instructions and Installation 10-3 Monitor Assembly 10-3...

  • Page 38: Attaching A Base

    10 Operating Instructions and Installation 10-4 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 39: Disassembly And Reassembly

    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 40 11 Disassembly and Reassembly Description Picture Description 1. Remove 4 screw from the stand 2. Remove the stand and front coler 11-2...
  • Page 41 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 42 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 43 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 44: Power Board

    12 PCB Diagram 12-2 Power Board 12-2-1 Power Board TOP Layer 12-2-2 Power Board BOTTOM Layer 12-2...

  • Page 45: Circuit 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 46 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 47: Ip Board Part(Power) Schematic Diagrams

    13 Circuit Descriptions 13-1-3 IP Board Part(Power) Schematic Diagrams 13-3...
  • Page 48 13 Circuit Descriptions 13-2 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 49: 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 50 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 51: Connecting The Monitor

    14 Reference Infomation 14-2 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 52: Pin Assignments

    14 Reference Infomation 14-3 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 53: Timing Chart

    14 Reference Infomation 14-4 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 54: Preset Timing Modes

    14 Reference Infomation 14-5 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 55: Panel Description

    14 Reference Infomation 14-6 Panel Description Maker VENDOR P/N PANEL_CODE PANEL_ABB STICKER_CODE Remarks 631102071830r LCD PANEL 17" MT170EN01 631102070680r LCS PANEL 17" CLAA170EA07Q(CPT) 14-7...
  • Page 56 14 Reference Infomation Memo 14-8...

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