LCD-Monitor Chassis LHA20WS Model SERVICE LCD Monitor 205BW Manual Fashion Feature - Premium HAS application(Lift 80mm) - Magic Rotation application (Auto pivot Delete) - Embeded Power, Mechanical S/W application
Copyright Trademarks ©2006 by Samsung Electronics Co., Ltd. Samsung is the registered trademark of Samsung Electronics Co., Ltd. All rights reserved. This manual may not, in whole or in part, be copied, photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of Samsung Electronics Co., Ltd. LHA20WS Service Manual First edition March 2006. Printed in Korea.
Contents 1. Precautions ………………………………………………………………………………………………………………………………………1 1-1 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 2.
Contents 8. Wiring Diagram …………………………………………………………………………………………………………………………………8 8-1 9. Schematic Diagrams ……………………………………………………………………………………………………………………………9 9-1 9-1 Schematic Diagrams ……………………………………………………………………………………………………………………… 9-1 9-2 Schematic Diagrams ………………………………………………………………………………………………………………………9-3 10.
-This Service Manual is a property of Samsung Electronics Co., Ltd. Any unauthorized use of Manual can be punished under applicable International and/or domestic law. Samsung Electronics Co.,Ltd. 416, Maetan-3Dong, Yeongtong-Gu, Suwon City, Gyeonggi-Do, Korea, 443-742 Printed in Korea P/N : BN82-00136G-00 URL : http://itself.sec.samsung.co.
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 menu or return to the previous menu. 3) Internet : Medium brightness For working with a mixture of images such as text and graphics. 2. MagicBright button MagicBright is a new feature providing optimum viewing environment depending on the contents of the image you are watching.
10 Operating Instructions and Installation 4. Enter button / Source button Activates a highlighted menu item. / Push the 'SOURCE', then selects the video signal while the OSD is off. (When the source button is pressed to change the input mode, a message appears in the left upper side of the screen displaying the current mode -- analog or digital input signal.) Note : If you select the digital mode, you must connect your monitor to the graphic card's port using the DVI cable. 5.
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 when using it in a public place. (The locking device has to be purchased separately.) Stand Stopper : Remve the fixing pin on the stand to lift the monitor up and down.
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. Remove four screws(A) and then remove the Stand from the LCD monitor.
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. Remove four screws and then remove the stand from the LCD monitor. 4.
10 Operating Instructions and Installation Memo 10-6
PCB Daigram 12 PCB Diagram 12-1
12 PCB Diagram Memo 12-2
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. Disassembly stand on the flat desk. 2. Disconnect the monitor from the power source before disassembly. 1. Separate the screw. (2 point) 2. Use the Jig and Separate Cover Rear.
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.
13 Circuit Descriptions 13 Circuit Descriptions 13-1 Block description 13-1
13 Circuit Descriptions 13-2 Block operating No Feature 1 Scaler 2 DDR MEMORY 3 MICOM Description Scaler Integrate ADC and TMDS, Scaling part. DDR memory Save frame information that SCALER needed . Microcontroller. 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.
14 Reference Infomation 14 Reference Infomation 14-1 Technical Terms - TFT-LCD (Thin film Transistor Liquid Crystal Display) ADC(Analog to Digital Converter) This is a circuit that converts from analog signal to digital signals. - PLL(Phase Locked Loop) During progressing ADC, Device makes clock synchronizing HSYNC with Video clock - Inverter Device that supplies Power to LCD panel lamp. This device generates about 1,500~2,000V. - SMPS(Switching Mode Power Supply) Switching Mode Power supply.
14 Reference Infomation - Dot Pitch The image on a monitor is composed of red, green and blue dots. The closer the dots, the higher the resolution. The distance between two dots of the same color is called the 'Dot Pitch'. Unit: mm - Vertical Frequency The screen must be redrawn several times per second in order to create and display an image for the user. The frequency of this repetition per second is called Vertical Frequency or Refresh Rate.
14 Reference Infomation - Connecting the Monitor 1. 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. 2-2. Using the DVI (Digital) connector on the video card. Connect the DVI cable to the DVI port on the back of your monitor. 2-3. Connected to a Macintosh.
14 Reference Infomation 14-2 Pin Assignments Sync Type Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 15-Pin D-Sub Signal Cable Connector Separate Composite Sync-on-green Red Green Blue GND DDC Return (GND) GND-R GND-G GND-B DDC Power Input (+5V) Self Raster GND Bi-Dr Data (SDA) H-Sync. V-Sync. DDC Clock (SCL) Red Green Blue GND DDC Return (GND) GND-R GND-G GND-B DDC Power Input (+5V) Self Raster GND Bi-Dr Data (SDA) H/V-Sync. Not Used DDC Clock (SCL) Red Green + H/V Sync.
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 IBM Mode VGA2/ 70 Hz Timing VGA3/ 60 Hz 640/75 Hz 800/60 Hz 800/75 Hz 1024/60 Hz 1024/75 Hz 1280/60 Hz 1280/75 Hz 720 x 400 640 x 480 640x480 800x600 800x600 1024x768 1024x768 1280x1024 1280x1024 fH (kHz) 31.469 31.469 37.500 37.879 46.875 48.363 60.023 63.981 79.
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. Refer to the video card manual and adjust the screen as follows. Table 1. Preset Timing Display Mode Horizontal Frequency (kHz) Vertical Frequency (Hz) Pixel Clock (MHz) Sync Polarity (H/V) MAC, 640 x 480 35.000 66.667 30.
14 Reference Infomation 14-5 Panel Description Maker SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC VENDOR P/N LT140X1-002 LT150XS-L01 LT150XS-L01-B LTM150XS-L02 LT181E2-132 LT150XS-T01 LTM181E3-132 LT170E2-131 LT181E2-131 LTM170E4-L01 LTM240W1-L0
14 Reference Infomation Maker SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC SEC CPT CPT CPT CPT CPT CPT CPT CPT CPT CPT CPT CPT TOSHIBA TOSHIBA TOSHIBA TOSHIBA TOSHIBA TOSHIBA TOSHIBA TOSHIBA HANNSTAR HANNSTAR HANNSTAR HANNSTAR HANNSTAR HANNSTAR TORISAN TORISAN TORISAN TORISAN TORISAN TORISAN TORISAN TORISAN TORISAN TORISAN TORISAN TORISAN 14-8 VENDOR P/N PANEL_CODE LTA460H1-L01 LTM170EU-L11 LTM24
14 Reference Infomation Maker TORISAN TORISAN TORISAN TORISAN TORISAN TORISAN TORISAN TORISAN TORISAN SHARP SHARP SHARP HITACHI HITACHI HITACHI HITACHI HITACHI HITACHI HITACHI IBM UNIPAC HYUNDAI HYUNDAI HYUNDAI HYUNDAI HYUNDAI HYUNDAI HYUNDAI HYUNDAI HYUNDAI HYUNDAI HYUNDAI ACER ACER ACER ACER ACER ACER ACER ACER ACER ACER ACER ACER ACER ACER ACER ACER ACER ACER ACER ACER ACER CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIMEI CHIM
14 Reference Infomation Memo 14-10
4 Troubleshooting 4 Troubleshooting 4-1 No Power There is no light in the power indicator. 1 Does proper DC 14 V appear at Pin 1,2,5 of CN600? No Check the IP Board. Yes 2 Does proper DC 5V appear at Output of IC302? No Check the IC302 Yes 3 Does proper DC 3.3V appear at Pin 3 of the IC600? No Check the IC600. Yes 4 Does proper DC 1.8V appear at Pin 2 of the IC602? No Check the IC602. Yes Check IC200 and IC301.
4 Troubleshooting WAVEFORMS 1 2 3 4 4-2
4 Troubleshooting 4-2 No Video (PC Analog Signal) 5 Is pin9 of CN500(BKLT_EN)high(3.3V)? No Check TFT_LCD panel or inverter and connection between then. Yes Does the analog video signal 6 appear at R134, 136, 138 (Red,Green,Blue)? No Check pc signal. Yes 7 Does the X300 oscilate Properly? No Check the X300. Yes 8 Does the proper clock pules appear at Pin6,7 of the CN400? No Check CN400. Yes Replace LCD Panel.
4 Troubleshooting WAVEFORMS 5 6 7 8 4-4
4 Troubleshooting 4-3 No Video (PC Digital Signal) 1 Is Pin9 of CN500(BKLT_EN)high(3.3V)? No Check TFT_LCD panel or inverter and connection between then. Yes 9 Does the Digital video signal appear at R100 ~ R107? No Check PC signal. Yes Does the proper clock pules appear at Pin6,7 of the CN400? 8 No Check IC300. Yes Replace LCD Panel.
4 Troubleshooting WAVEFORMS 1 9 4-6 8
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. MTI-2031 DDC MANAGER JIG 3-2 Automatic Color Adjustment To Analog video, In 16gray or any pattern using black and white and any mode.(16gray and XGA mode recommend) 1.
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. Monitor On Time : Power on time 2. Panel Cycle : Panel on/off time(Power off, mode change, DPMS on/off..) 3. Panel : Panel on time (Each time the panel is replaced press the menu key for 5 seconds to add to the Ch. No.
3 Alignments and Adjustments 3-5 Hidden Key list No Function 1. Hidden Service Function 2. Factory Reset 3. Auto calibration 4. OSD lock Action method -. After setting brightness and contrast '0' push the "Enter" button more than 5 seconds. -. Service Function appear. -. While Menu is opened(any menu), press "enter" key over 5 seconds. -. Screen is flashing, then all menus return to the factory default. To Analog video, In 16gray or any pattern using black and white and any mode.
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. File open. 4. Select Port#1 Load DDC fileFile Name -. "SM205BWA.ddc" -. "SM205BWD.ddc" Click Next(OK) button.
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. Auto Calibration 2. EDID installation(Analog and Digital) 3.
3 Alignments and Adjustments Memo 3-6
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 LS20HAWCSZ/EDC 205BW,WPA1/S20B2-LHA,20,LCD-MO,NETHERLAN Q'ty SA/SNA 0.1 M0001 BN90-00900G ASSY COVER FRONT;ATZ-LS20HAWCSZ/EDC,4lmp 1 ..2 T0003 BN96-03328F ASSY COVER P-FRONT;LS20HAW,ABS HB,GR70,S 1 S.A ...
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 4 ...3 T0081 BN73-00085A RUBBER CUSHION;MATISSE,¨ª4.5(IN SIDE),CL 1 S.N.A ...3 M0007 BN96-01524A ASSY STAND P-STOPPER;MJ17BS,SUS T1.0,L26 1 S.N.A ...3 M0126 BN96-02310A ASSY STAND P-SPRING;HA19TS,SUS301 2 S.N.A ...3 T0054 BN96-05355A ASSY HINGE P;940B,HGI,SGCC,T2.0 1 S.A BN60-00040A SPACER-WASHER;940B,SK-5,8.0,14.0,0.
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 1 S.A ....4 D221 0406-001061 DIODE-TVS;MMQA5V6T3,5.32/5.6/5.88V,24W,S 1 S.A ....4 D232 0406-001061 DIODE-TVS;MMQA5V6T3,5.32/5.6/5.88V,24W,S 1 S.A ....4 ZD200 0406-001061 DIODE-TVS;MMQA5V6T3,5.32/5.6/5.88V,24W,S 1 S.A ....4 Q201 0501-000342 TR-SMALL SIGNAL;KSC1623-Y,NPN,200mW,SOT- 1 S.A ....
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 1 S.A ....4 R330 2007-000083 R-CHIP;3Kohm,5%,1/10W,TP,1608 1 S.A ....4 R331 2007-000083 R-CHIP;3Kohm,5%,1/10W,TP,1608 1 S.A ....4 R300 2007-000084 R-CHIP;4.7Kohm,5%,1/10W,TP,1608 1 S.A ....4 R307 2007-000084 R-CHIP;4.7Kohm,5%,1/10W,TP,1608 1 S.A ....4 R310 2007-000084 R-CHIP;4.7Kohm,5%,1/10W,TP,1608 1 S.A ....
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 1 S.A ....4 C202 2203-000257 C-CER,CHIP;10nF,10%,50V,X7R,1608 1 S.A ....4 C300 2203-000257 C-CER,CHIP;10nF,10%,50V,X7R,1608 1 S.A ....4 C313 2203-000257 C-CER,CHIP;10nF,10%,50V,X7R,1608 1 S.A ....4 C316 2203-000257 C-CER,CHIP;10nF,10%,50V,X7R,1608 1 S.A ....4 C319 2203-000257 C-CER,CHIP;10nF,10%,50V,X7R,1608 1 S.A ....
6 Electrical Parts List Level Loc. No. Code No. Description & Specification Q'ty SA/SNA ....4 C653 2203-005005 C-CER,CHIP;100nF,10%,16V,X7R,1608 1 S.A ....4 C304 2203-005065 C-CER,CHIP;1000nF,+80-20%,10V,Y5V,1608 1 S.A ....4 C305 2203-005065 C-CER,CHIP;1000nF,+80-20%,10V,Y5V,1608 1 S.A ....4 C309 2203-005065 C-CER,CHIP;1000nF,+80-20%,10V,Y5V,1608 1 S.A ....4 C311 2203-005065 C-CER,CHIP;1000nF,+80-20%,10V,Y5V,1608 1 S.A ....
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 1 S.N.A ...3 ACCESSORY BN68-01237A MANUAL FLYER-QSG;COMM,W/W(L12),Mojo 100g 1 S.N.A ...3 ACCESSORY BH68-00633B MANUAL FLYER-00,WARRANTY CARD;comm,Samsu 1 S.N.A ...3 ACCESSORY BN68-01118B MANUAL-01,TCO03 CARD;COMM,W/W,Mojo 100g, 1 S.N.A 0.1 M0003 BN92-01728D ASSY BOX;LS20HAWCSQ/EDC 1 S.N.A ..
6 Electrical Parts List Memo 6-8
7 Block Diagrams 7 Block Diagram 7-1
7 Block Diagrams 7-2
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 8-1
8 Wiring Diagram Memo 8-2
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 1. For continued safety, do not attempt to modify the circuit board. 2. Disconnect the AC power and DC power jack before servicing. 1-1-2 Servicing the LCD Monitor 1. When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet. 2.
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. 1-2-1 General Servicing Precautions 1. 2. 3.
1 Precautions 1-4 Installation Precautions 1. For safety reasons, more than two people are required for carrying the product. 6. Keep the antenna far away from any high-voltage cables and install it firmly. Contact with the highvoltage cable or the antenna falling over may 2. Keep the power cord away from any heat emitting cause fire or electric shock. devices, as a melted covering may cause fire or electric shock. 7.
1 Precautions Memo 1-4
