Samsung LHA20WS Service Manual
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Samsung LHA20WS Service Manual

Samsung LHA20WS Service Manual

Chassis lha20ws
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SERVICE
LCD Monitor
LCD-Monitor
Chassis LHA20WS
Model
Manual
Fashion Feature
- Premium HAS application(Lift 80mm)
- Magic Rotation application
(Auto pivot Delete)
- Embeded Power, Mechanical S/W
application
205BW

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Summary of Contents for Samsung LHA20WS

  • Page 1: Service Manual

    LCD-Monitor Chassis LHA20WS Model 205BW SERVICE Manual LCD Monitor Fashion Feature - Premium HAS application(Lift 80mm) - Magic Rotation application (Auto pivot Delete) - Embeded Power, Mechanical S/W application...
  • Page 2 Copyright Trademarks Samsung is the registered trademark of Samsung ©2006 by Samsung Electronics Co., Ltd. Electronics Co., Ltd. All rights reserved. LHA20WS and MacMaster Cable Adapter are This manual may not, in whole or in part, be copied, trademarks of Samsung Electronics Co., Ltd.

  • Page 3: Table Of Contents

    4-2 No Video (PC Analog Signal) …………………………………………………………………………………………………………… 4-3 4-3 No Video (PC Digital Signal) …………………………………………………………………………………………………………… 4-5 . Exploded View and Parts List ………………………………………………………………………………………………………………5 5-1 LHA20WS Exploded View ……………………………………………………………………………………………………………… 5-1 5-2 LHA20WS Parts List ……………………………………………………………………………………………………………………… 5-2 . Electrical Parts List ……………………………………………………………………………………………………………………………6 6-1 LHA20WS Parts List ……………………………………………………………………………………………………………………… 6-1...
  • Page 4 Contents . Wiring Diagram …………………………………………………………………………………………………………………………………8 9. S chematic Diagrams ……………………………………………………………………………………………………………………………9 9-1 Schematic Diagrams ……………………………………………………………………………………………………………………… 9-1 9-2 Schematic Diagrams ………………………………………………………………………………………………………………………9-3 1 1 0. Operating Instructions and Installation … … …………………………………………………………………………………………………10-1 10-1 Front …………………………………………………………………………………………………………………………………… 10-1 10-2 Rear ………………………………………………………………………………………………………………………………………10-2 10-3 Using the Stand …………………………………………………………………………………………………………………………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 : BN82-00136G-00 law.

  • Page 6: 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 7: Rear

    10 Operating Instructions and Installation 4. Enter button / Source button 5. Auto button Activates a highlighted menu item. / When the 'AUTO' button is pressed, the Auto Push the 'SOURCE', then selects the video signal Adjustment screen appears as shown in the ani- while the OSD is off.
  • Page 8 10 Operating Instructions and Installation DVI IN port : Connect the DVI Cable to the DVI IN port on the back of your monitor. (SOURCE : digital) RGB IN port : Connect the signal cable to the RGB IN port on the back of your monitor. (SOURCE : analog) Kensington Lock : The Kensington lock is a device used to physically fix the system...

  • Page 9: Using The Stand

    10 Operating Instructions and Installation 10-3 Using the Stand 10-3-1 Removing the base 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 10 10 Operating Instructions and Installation 10-3-2 Attaching a Base - This monitor accepts a 100mm x 100mm VESA-compliant mounting interface pad. 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 11 10 Operating Instructions and Installation Memo 10-6...
  • Page 12 12 PCB Daigram 12 PCB Diagram 12-1...
  • Page 13 12 PCB Diagram Memo 12-2...

  • Page 14: 1 1. Disassembly And Reassembly

    11 Disassembly and Reassembly 11 Disassembly and Reassembly This section of the service manual describes the disassembly and reassembly procedures for the LHA20WS TFT-LCD monitors. WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling these components. 11-1 Disassembly Cautions: 1.

  • Page 15: Reassembly

    11 Disassembly and Reassembly 3. Separate cable Main Board and Separate screw between Shield PCB and Bracket PCB.(2 point) 4. Separate screw Between Shield PCB and Panel. (4 point) 5. Separate harness of the Panel with the IP Borad with the Main Board. 11-2 Reassembly Reassembly procedures are in the reverse order of disassembly procedures.

  • Page 16: C C Ircuit Descriptions

    13 Circuit Descriptions 13 Circuit Descriptions 13-1 Block description 13-1...

  • Page 17: Block Operating

    13 Circuit Descriptions 13-2 Block operating Feature Description Scaler Scaler Integrate ADC and TMDS, Scaling part. DDR memory Save frame information that SCALER needed . MEMORY Microcontroller. MICOM Micom control all function of monitor. Analog signal from the PC is changed to digital signal using the A/D converter integrated in scaler(MST6281). Scaler scale this digital singal to optimal signal fit to the panel and encode the LVDS signal.

  • Page 18: Reference Infomation

    14 Reference Infomation 14 Reference Infomation 14-1 Technical Terms - TFT-LCD - FINE "Fine" adjustment is used to adjust visibility by (Thin film Transistor Liquid Crystal Display) ADC(Analog to Digital Converter) control phase difference. This is a circuit that converts from analog signal to digital signals.
  • Page 19 14 Reference Infomation - Dot Pitch - External Device Input The image on a monitor is composed of red, green External device input refers to video input from and blue dots. The closer the dots, the higher the such external video devices as VCRs, camcorders resolution.

  • Page 20: Connecting The Monitor

    14 Reference Infomation - Connecting the Monitor Connect the DC adapter 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 21: Pin Assignments

    14 Reference Infomation 14-2 Pin Assignments Sync 15-Pin D-Sub Signal Cable Connector Type Separate Composite Sync-on-green Pin No. Green Green Green + H/V Sync. Blue Blue Blue DDC Return (GND) DDC Return (GND) DDC Return (GND) GND-R GND-R GND-R GND-G GND-G GND-G GND-B...

  • Page 22: 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 14-1 Timing Chart VESA Mode VGA2/ VGA3/ 640/75 Hz 800/60 Hz 800/75 Hz 1024/60 Hz 1024/75 Hz 1280/60 Hz...

  • Page 23: 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 24: Panel Description

    14 Reference Infomation 14-5 Panel Description Maker VENDOR P/N PANEL_CODE PANEL_ABB STICKER_CODE Remarks LT140X1-002 BN07-00004A BN68-00239H LT150XS-L01 BN07-00009A LT150XS-L01-B BN07-00022A LTM150XS-L02 BN07-00005A LT181E2-132 BN07-00001A LT150XS-T01 BN07-00010A LTM181E3-132 BN07-00019A LT170E2-131 BN07-10001D LT181E2-131 BN07-10001E LTM170E4-L01 BN07-00018A LTM240W1-L01 BN07-00015A LTM213U3-L01 BN07-00016A LTM150XH-L01 BN07-00026A LTM150XH-L03 BN07-00027A LTM150XS-L01...
  • Page 25 14 Reference Infomation Maker VENDOR P/N PANEL_CODE PANEL_ABB STICKER_CODE Remarks LTA460H1-L01 BN07-00157A "creat panel code for AMLCD 46"" TV " LTM170EU-L11 BN07-00160A "creat new panel code for AMLCD 17"" (Panel only for TCO03)" LTM240W1-L03 BN07-00134B "24"" panel ZPD code derivation" LTM190E4-L01 BN07-00145B "AMLCD 19""...
  • Page 26 14 Reference Infomation Maker VENDOR P/N PANEL_CODE PANEL_ABB STICKER_CODE Remarks TORISAN TM290WX-71N31 BN07-00115A "Color Coordinates change panel for TORISAN 29"" TV" TORISAN TM396WX-71N31 BN07-00116A RP,Q "Color Coordinates change panel for TORISAN 40"" TV" TORISAN TM22OWX-71N31 BN07-00125A "Development TORISAN 22"" TV PANEL (ZPD)" TORISAN TM22OWX-71N31 BN07-00127A...
  • Page 27 14 Reference Infomation Memo 14-10...
  • Page 28 4 Troubleshooting 4 Troubleshooting 4-1 No Power There is no light in the power indicator. Does proper DC 14 V appear at Pin 1,2,5 Check the IP Board. of CN600? Does proper DC 5V Check the IC302 appear at Output of IC302? Does proper DC 3.3V Check the IC600.
  • Page 29 4 Troubleshooting WAVEFORMS...
  • Page 30 4 Troubleshooting 4-2 No Video (PC Analog Signal) Is pin9 of Check TFT_LCD panel or inverter CN500(BKLT_EN)high(3.3V)? and connection between then. Does the analog video signal Check pc signal. appear at R134, 136, 138 (Red,Green,Blue)? Does the X300 Check the X300. oscilate Properly? Does the proper clock pules Check CN400.
  • Page 31 4 Troubleshooting WAVEFORMS...
  • Page 32 4 Troubleshooting 4-3 No Video (PC Digital Signal) Check TFT_LCD panel or inverter Is Pin9 of and connection between then. CN500(BKLT_EN)high(3.3V)? Does the Digital video Check PC signal. signal appear at R100 ~ R107? Does the proper clock pules appear at Pin6,7 Check IC300.
  • Page 33 4 Troubleshooting WAVEFORMS...

  • Page 34: 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 35: Service Function Spec

    3 Alignments and Adjustments 3-4 Service Function Spec. 3-4-1 How to Display Service Function OSD 1. After setting both brightness and contrast to '0' push the 'enter' button more than 5 seconds. 2. service function appear as below. Figure 2. 3-4-2 How to Control Service Function OSD 1.

  • Page 36: Hidden Key List

    3 Alignments and Adjustments 3-5 Hidden Key list Function Action method Hidden Service Function -. After setting brightness and contrast '0' push the "Enter" button more than 5 seconds. -. Service Function appear. Factory Reset -. While Menu is opened(any menu), press "enter" key over 5 seconds.
  • Page 37 3 Alignments and Adjustments 3-6 DDC Input Method(Windows Program) After change a Main Board ,DDC input shpuld be done via DDC control JIG. Connecting method is refer to below picture. 1. Winddc.exe Program install in PC 2. Cilck the Winddc icon. 3.

  • Page 38: Execution Items After Replacing The Main Board

    3 Alignments and Adjustments 5: Input a monitor serial number and push the enter key. After Analog input, Please do # 2 ~ 5 when digital input. 3-7 Execution Items after replacing the main board After Replacing the Maing Board 1.
  • Page 39 3 Alignments and Adjustments Memo...

  • Page 40: 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 LS20HAWCSZ/EDC Parts List Level Loc. No. Code No. Description & Specification Q'ty SA/SNA LS20HAWCSZ/EDC 205BW,WPA1/S20B2-LHA,20,LCD-MO,NETHERLAN M0001 BN90-00900G ASSY COVER FRONT;ATZ-LS20HAWCSZ/EDC,4lmp...
  • Page 41 6 Electrical Parts List Level Loc. No. Code No. Description & Specification Q'ty SA/SNA ...3 T0132 BN73-00077A RUBBER FOOT;MATISSE,BUMPON,¨ª13.5,T2.0,6 S.N.A ...3 T0081 BN73-00085A RUBBER CUSHION;MATISSE,¨ª4.5(IN SIDE),CL S.N.A ...3 M0007 BN96-01524A ASSY STAND P-STOPPER;MJ17BS,SUS T1.0,L26 S.N.A ...3 M0126 BN96-02310A ASSY STAND P-SPRING;HA19TS,SUS301 S.N.A ...3 T0054...
  • Page 42 6 Electrical Parts List Level Loc. No. Code No. Description & Specification Q'ty SA/SNA ..4 D231 0403-001411 DIODE-ZENER;-,5.49-5.73V,200mW,SOD-323,T ..4 D221 0406-001061 DIODE-TVS;MMQA5V6T3,5.32/5.6/5.88V,24W,S ..4 D232 0406-001061 DIODE-TVS;MMQA5V6T3,5.32/5.6/5.88V,24W,S ..4 ZD200 0406-001061 DIODE-TVS;MMQA5V6T3,5.32/5.6/5.88V,24W,S ..4 Q201 0501-000342 TR-SMALL SIGNAL;KSC1623-Y,NPN,200mW,SOT- ..4 Q302 0501-002080 TR-SMALL SIGNAL;2SC2412K,NPN,200mW,SC-59 ..4 Q409 0505-001957...
  • Page 43 6 Electrical Parts List Level Loc. No. Code No. Description & Specification Q'ty SA/SNA ..4 R311 2007-000083 R-CHIP;3Kohm,5%,1/10W,TP,1608 ..4 R330 2007-000083 R-CHIP;3Kohm,5%,1/10W,TP,1608 ..4 R331 2007-000083 R-CHIP;3Kohm,5%,1/10W,TP,1608 ..4 R300 2007-000084 R-CHIP;4.7Kohm,5%,1/10W,TP,1608 ..4 R307 2007-000084 R-CHIP;4.7Kohm,5%,1/10W,TP,1608 ..4 R310 2007-000084 R-CHIP;4.7Kohm,5%,1/10W,TP,1608 ..4 R318 2007-000084 R-CHIP;4.7Kohm,5%,1/10W,TP,1608 ..4...
  • Page 44 6 Electrical Parts List Level Loc. No. Code No. Description & Specification Q'ty SA/SNA ..4 C201 2203-000257 C-CER,CHIP;10nF,10%,50V,X7R,1608 ..4 C202 2203-000257 C-CER,CHIP;10nF,10%,50V,X7R,1608 ..4 C300 2203-000257 C-CER,CHIP;10nF,10%,50V,X7R,1608 ..4 C313 2203-000257 C-CER,CHIP;10nF,10%,50V,X7R,1608 ..4 C316 2203-000257 C-CER,CHIP;10nF,10%,50V,X7R,1608 ..4 C319 2203-000257 C-CER,CHIP;10nF,10%,50V,X7R,1608 ..4 C121 2203-000384 C-CER,CHIP;0.015nF,5%,50V,C0G,1608 ..4...
  • Page 45 ASSY ACCESSORY;LS20HAWCSQ/EDC ...3 T0268 3903-000042 CBF-POWER CORD;DT,EU,FP3/YES,IEC320 C13/ ...3 T0524 6902-000110 BAG PE;LDPE,T0.05,W250,L400,TRP,28,2 S.N.A ...3 ACCESSORY BH68-70448A CARD-01;TFT LCD,SRC,RUSSIA,S/W,120,W210* S.N.A ...3 ACCESSORY BN68-00907A MANUAL FLYER-01,CARD;COMM,SAMSUNG,18 LAN S.N.A ...3 M0215 BN96-03059C ASSY MANUAL P-IB+QSG;203BW,SyncMaster,W/ S.N.A ..4 BH68-00376L MANUAL FLYER-06,QSG;LCDQUICK SETUP GUIDE S.N.A...
  • Page 46 6 Electrical Parts List Level Loc. No. Code No. Description & Specification Q'ty SA/SNA ..4 T0081 BN59-00509C S/W DRIVER-06,IB;203BW,W/W,SyncMaster,Ha S.N.A ...3 ACCESSORY BN68-01237A MANUAL FLYER-QSG;COMM,W/W(L12),Mojo 100g S.N.A ...3 ACCESSORY BH68-00633B MANUAL FLYER-00,WARRANTY CARD;comm,Samsu S.N.A ...3 ACCESSORY BN68-01118B MANUAL-01,TCO03 CARD;COMM,W/W,Mojo 100g, S.N.A M0003 BN92-01728D...
  • Page 47 6 Electrical Parts List Memo...

  • Page 48: Block Diagram

    7 Block Diagrams 7 Block Diagram...
  • Page 49 7 Block Diagrams...
  • Page 50 8 Wiring Diagram 8 Wiring Diagram Connected to the I/P board Connected to the Panel through the LVDS cable For test(not used) For DVI signal For function key For Analog signal...
  • Page 51 8 Wiring Diagram Memo...
  • Page 52 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 53 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 54 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 55 1 Precautions Memo...

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