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Samsung 205BW - SyncMaster - 20" LCD Monitor, Service Manual

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Samsung 205BW - SyncMaster - 20

4 Troubleshooting

4-5

Is Pin9 of

CN500(BKLT_EN)high(3.3V)?

4-3 No Video (PC Digital Signal)

1

Check TFT_LCD panel or inverter

and connection between then.

Yes

No

Does the Digital video

signal appear at

R100 ~ R107?

Check PC signal.

Yes

No

Does the proper clock pules

appear at Pin6,7

of the CN400?

Check IC300.

No

8

9

Replace LCD Panel.

Yes

Summary of Contents for 205BW - SyncMaster - 20" LCD Monitor

Page 1: ...SERVICEManual LCD Monitor Fashion Feature LCD Monitor Chassis LHA20WS Model 205BW Premium HAS application Lift 80mm Magic Rotation application Auto pivot Delete Embeded Power Mechanical S W application ...

Page 2: ...thout prior written permission of Samsung Electronics Co Ltd LHA20WS Service Manual First edition March 2006 Printed in Korea Trademarks Samsung is the registered trademark of Samsung Electronics Co Ltd LHA20WS and MacMaster Cable Adapter are trademarks of Samsung Electronics Co Ltd Macintosh Power Macintosh are trademarks of Apple Computer Inc All other trademarks are the property of their respec...

Page 3: ...ents 3 3 1 3 1 Required Equipment 3 1 3 2 Automatic Color Adjustment 3 1 3 3 DDC EDID Data Input 3 1 3 4 Service Function Spec 3 2 3 5 Hidden Key list 3 3 3 6 EDID Installation with Windows Program 3 4 3 7 Execution Items after replacing the main board 3 4 4 4 Troubleshooting 4 4 1 4 1 No Power 4 1 4 2 No Video PC Analog Signal 4 3 4 3 No Video PC Digital Signal 4 5 5 5 Exploded View and Parts Lis...

Page 4: ...0 3 Using the Stand 10 4 1 11 Disassembly and Reassembly 1 11 1 11 1 Disassembly 11 1 11 2 Reassembly 11 3 1 12 PCB Diagram 1 12 1 13 C Circuit Descriptions 1 13 1 13 1 Block description 13 1 13 2 Block operating 13 2 1 14 Reference Infomation 1 14 1 14 1 Technical Terms 14 1 14 2 Pin Assignments 14 4 14 3 Timing Chart 14 5 14 4 Preset Timing Modes 14 6 14 5 Panel Description 14 7 Contents ...

Page 5: ... City Gyeonggi Do Korea 443 742 Printed in Korea P N BN82 00136G 00 URL http itself sec samsung co kr 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 ...

Page 6: ...ing MagicBright control buttons 1 Custom Although the values are carefully chosen by our engineers the pre configured values may not be comfortable to your eyes depending on your taste If this is the case adjust the brightness and con trast by using the OSD menu 2 Text Normal brightness For documentations or works involving heavy text 3 Internet Medium brightness For working with a mixture of imag...

Page 7: ...ying the current mode analog or digital input signal Note If you select the digital mode you must con nect your monitor to the graphic card s port using the DVI cable 5 Auto button When the AUTO button is pressed the Auto Adjustment screen appears as shown in the ani mated screen on the center Auto adjustment allows the monitor to self adjust to the incoming video signal The values of fine coarse ...

Page 8: ...log 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 DVI IN port Connect the DVI Cable to the DVI IN port on the back of your monitor SOURCE digital ...

Page 9: ...ing 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 ...

Page 10: ...h a cushion beneath it to protect the screen 3 Remove four screws and then remove the stand from the LCD monitor 4 Align the mounting interface Pad with the holes in the rear cover mounting pad and secure it with four screws that came with the arm type base wall mount hanger or other base 10 3 2 Attaching a Base This monitor accepts a 100mm x 100mm VESA compliant mounting interface pad ...

Page 11: ...Memo 10 Operating Instructions and Installation 10 6 ...

Page 12: ...12 PCB Daigram 12 1 12 PCB Diagram ...

Page 13: ...12 PCB Diagram 12 2 Memo ...

Page 14: ...cedures 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 ...

Page 15: ...ures are in the reverse order of disassembly procedures 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 ...

Page 16: ...13 Circuit Descriptions 13 1 13 Circuit Descriptions 13 1 Block description ...

Page 17: ...ST6281 Scaler scale this digital singal to optimal signal fit to the panel and encode the LVDS signal This LVDS signla enter the panel to show the image through the LVDS Connector In Case of DVI singal integrated TMDS Block is operating and processing MIcom control the all function of the monitor and OSD DC DC Block make a suitable voltages from output 14V of I P board which are used for function ...

Page 18: ...Fine and Coarse FINE Fine adjustment is used to adjust visibility by control phase difference COARSE This is a adjustment by tuning with Video colck and PLL clock DVI Digital Visual Interface This provides a high speed digital connection for visual data types that is display technology independent this interface is primarily forcused at providing a connection between a computer and its display dev...

Page 19: ...used for the majority of monitors to ensure a clear image The Interlace method is the same as that used in TVs Plug Play This is a function that provides the best quality screen for the user by allowing the computer and the monitor to exchange information automatically This monitor follows the international standard VESA DDC for the Plug Play function Resolution The number of horizontal and vertic...

Page 20: ...nnected to a Macintosh Connect the monitor to the Macintosh computer using the D SUB connection cable 2 4 In the case of an old model Macintosh you need to connect the monitor using a special Mac adapter 3 Turn on your computer and monitor If your monitor displays an image installation is complete You may get a blank screen depending on the type of video card you are using if you connect simultane...

Page 21: ...ower Input 5V Self Raster GND Bi Dr Data SDA H V Sync Not Used DDC Clock SCL Red Green H V Sync Blue GND DDC Return GND GND R GND G GND B DDC Power Input 5V Self Raster GND Bi Dr Data SDA Not Used Not Used DDC Clock SCL Sync on green No Connection 5V_M Self Raster 5V_M Rx0 Rx0 NC No Connection No Connection NC RxC RxC 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 Rx2 Rx2 GND No Co...

Page 22: ...emark IBM 640 75 Hz 640x480 800 60 Hz 800x600 800 75 Hz 800x600 1024 60 Hz 1024x768 1024 75 Hz 1024x768 VGA2 70 Hz 720 x 400 VGA3 60 Hz 640 x 480 Table 14 1 Timing Chart 31 469 31 778 3 813 1 589 26 058 0 318 59 940 16 683 0 064 0 794 15 761 0 064 26 175 Negative Negative Separate 37 500 26 667 2 032 3 810 20 317 0 508 75 000 13 333 0 080 0 427 12 800 0 027 31 500 Negative Negative Separate 37 879...

Page 23: ...0 x 1024 63 981 60 020 108 00 VESA 1280 x 1024 79 976 75 025 135 00 VESA 1600 x 1200 75 000 60 000 162 00 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 ...

Page 24: ...A EW Color coordinates change for LCD TV SEC LTM153W1 L01 BN07 00092A EX AMLCD WIDE 15 9 10 SEC LTM170W1 L01 BN07 00100A EY Color Coordinates change code management SEC LTM170EH L05 BN07 00097A EZ LTM170E5 L05 Color Coordinates Change Panel Code SEC LTA400W1 L01 BN07 00109A S1 PANEL of AMLCD 40 TV SEC LTM153W1 L01 BN07 00110A S2 Color coordinates change 0 280 0 290 10000k ZPD Panel SEC LTM150XH L0...

Page 25: ... L11 BN07 00239A SPZ AMLCD 26 16 9 7Line new Panel SEC LTA400WS LH1 BN07 00245A SPZ AMLCD 40 16 9 SPVA 90 new Panel SEC LTM213U6 L01 BN07 00231A SPZ AMLCD 21 3 PVA new Panel Code SEC LTA320WS LH2 BN07 00244A SPZ AMLCD 32 16 9 SPVA 90 new Panel SEC LTA400WS LH1 BN07 00245A SPZ AMLCD 40 16 9 SPVA 90 new Panel CPT CLAA150XG09 BN07 00141A PA CPT 15 Monitor new panel development CPT CLAA170EA02 BN07 00...

Page 26: ...erivation ZPD ACER M170EN06 BN07 00171A ATH AU Monitor 17 New panel development ACER T260XW01 BN07 00163A AMZ AU 26 new panel development NF26EO ACER A201SN01 BN07 00177A ATZ AU TV panel 20 1 TN SVGA new panel development ACER M170EN06 BN07 00171B ATZ AU Monitor 17 ZPD code derivation ACER T315XW01 BN07 00194A AMZ AU 32 new ACER M170EG01 BN07 00192A ATH AU TN PSWG type new Panel code ACER M170EG01...

Page 27: ...Memo 14 Reference Infomation 14 10 ...

Page 28: ...eck the IP Board There is no light in the power indicator Check IC200 and IC301 Yes No Does proper DC 5V appear at Output of IC302 Check the IC302 Yes No Does proper DC 3 3V appear at Pin 3 of the IC600 Check the IC600 No Yes Yes Does proper DC 1 8V appear at Pin 2 of the IC602 Check the IC602 No 1 2 3 4 ...

Page 29: ...4 Troubleshooting 4 2 WAVEFORMS 2 1 3 4 ...

Page 30: ...LCD panel or inverter and connection between then Yes No Does the analog video signal appear at R134 136 138 Red Green Blue Check pc signal Yes No Does the X300 oscilate Properly Check the X300 No Yes Does the proper clock pules appear at Pin6 7 of the CN400 Check CN400 No Yes Replace LCD Panel 6 7 8 ...

Page 31: ...4 Troubleshooting 4 4 WAVEFORMS 6 5 8 7 ...

Page 32: ... Video PC Digital Signal 1 Check TFT_LCD panel or inverter and connection between then Yes No Does the Digital video signal appear at R100 R107 Check PC signal Yes No Does the proper clock pules appear at Pin6 7 of the CN400 Check IC300 No 8 9 Replace LCD Panel Yes ...

Page 33: ...4 Troubleshooting 4 6 WAVEFORMS 8 1 9 ...

Page 34: ... the OSD Menu button to open the OSD 2 Selectl language English 3 Push enter button during 5 seconds 4 See the screen flashing 3 3 DDC EDID Data Input 1 Input DDC EDID data when replacing AD PCB 2 Receive Download the proper DDC file for the model from HQ quality control department Install the below jig Figure 1 and enter the data 3 Alignments and Adjustments This section of the service manual exp...

Page 35: ... Upper lamp on time When the upper lamp is replaced press menu to add to the Ch No which shows the number of times the lamp has been replaced 5 Lower lamp lower lamp on time When the upper lamp is replaced press menu to add to the Ch No which shows the number of times the lamp has been replaced 6 Auto auto If Auto auto menu set to on when the mode is changed for the first time Auto adjust function...

Page 36: ...lashing then all menus return to the factory default 3 Auto calibration To Analog video In 16gray or any pattern using black and white and any mode 16gray and XGA mode recommend 1 Push the OSD Menu button to open the OSD 2 Select language English 3 Push enter button during 5 seconds 4 Screen is flashed and auto calibration is completed 4 OSD lock Press the menu key over 5 seconds then OSD is locke...

Page 37: ...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 After change a Main Board DDC input shpuld be done via DDC control JIG Connecting method is refer to below picture ...

Page 38: ...Items after replacing the main board After Replacing the Maing Board 1 Auto Calibration 2 EDID installation Analog and Digital 3 Factory Reset 5 Input a monitor serial number and push the enter key After Analog input Please do 2 5 when digital input ...

Page 39: ...Memo 3 Alignments and Adjustments 3 6 ...

Page 40: ...1 S A 6 R1 2007 000123 R CHIP 1 5Kohm 5 1 10W TP 1608 1 S A 6 R2 2007 000123 R CHIP 1 5Kohm 5 1 10W TP 1608 1 S A 6 CN330 3711 005935 HEADER BOARD TO CABLE BOX 4P 1R 1mm SMD 1 S A 6 T0077 BN41 00633A PCB MAIN HAYDN FR4 2L MP1 0 0 6T 105 8 1 1 S N A 0 1 M0216 BN90 00907D ASSY STAND LS20HAWCSZ EDC 4LMP 1 S N A 2 M0003 BN96 05837A ASSY STAND P LS19HAW WIDE HIPS HB BK24 1 S A 3 T0081 6001 001547 SCREW...

Page 41: ... 3 0 5 0mA 1 S A 2 BN61 02426A BRACKET SHIELD S M 203B SPTE T0 3 1 S N A 2 M0014 BN94 01204H ASSY PCB MAIN ATZ W W LS20HAW 4LAMP 1 S N A 3 T0245 0202 001492 SOLDER WIRE FLUX HSE 02 LFM48 SR 34 S 0 003 S N A 3 CN102 3701 001173 CONNECTOR DVI 24P 3R FEMALE ANGLE AUF 1 S A 3 CN101 3701 001219 CONNECTOR DSUB 15P 3R FEMALE ANGLE AUF 1 S A 3 CN400 3711 005884 HEADER BOARD TO BOARD BOX 30P 2R 2mm ANG 1 S...

Page 42: ... R129 2007 000071 R CHIP 22ohm 5 1 10W TP 1608 1 S A 4 R130 2007 000071 R CHIP 22ohm 5 1 10W TP 1608 1 S A 4 R224 2007 000071 R CHIP 22ohm 5 1 10W TP 1608 1 S A 4 R225 2007 000071 R CHIP 22ohm 5 1 10W TP 1608 1 S A 4 R125 2007 000074 R CHIP 100ohm 5 1 10W TP 1608 1 S A 4 R126 2007 000074 R CHIP 100ohm 5 1 10W TP 1608 1 S A 4 R134 2007 000074 R CHIP 100ohm 5 1 10W TP 1608 1 S A 4 R136 2007 000074 R...

Page 43: ...0090 R CHIP 10Kohm 5 1 10W TP 1608 1 S A 4 R323 2007 000090 R CHIP 10Kohm 5 1 10W TP 1608 1 S A 4 R324 2007 000090 R CHIP 10Kohm 5 1 10W TP 1608 1 S A 4 R210 2007 000092 R CHIP 15Kohm 5 1 10W TP 1608 1 S A 4 R211 2007 000092 R CHIP 15Kohm 5 1 10W TP 1608 1 S A 4 R214 2007 000092 R CHIP 15Kohm 5 1 10W TP 1608 1 S A 4 R302 2007 000102 R CHIP 100Kohm 5 1 10W TP 1608 1 S A 4 R303 2007 000124 R CHIP 2 ...

Page 44: ... 100nF 10 16V X7R 1608 1 S A 4 C307 2203 005005 C CER CHIP 100nF 10 16V X7R 1608 1 S A 4 C308 2203 005005 C CER CHIP 100nF 10 16V X7R 1608 1 S A 4 C310 2203 005005 C CER CHIP 100nF 10 16V X7R 1608 1 S A 4 C322 2203 005005 C CER CHIP 100nF 10 16V X7R 1608 1 S A 4 C610 2203 005005 C CER CHIP 100nF 10 16V X7R 1608 1 S A 4 C611 2203 005005 C CER CHIP 100nF 10 16V X7R 1608 1 S A 4 C615 2203 005005 C CE...

Page 45: ...E BOX 4P 1R 1 25mm S 1 S A 4 T0010 BN27 00009A COIL CHOKE SMD 12X12X6 EOS 33UH 15 0 1 S A 4 T0077 BN41 00772C PCB MAIN DOPPLER CEM 3 2L 1 2 1 6 118 78 1 S N A 4 MICOM BN97 01361X ASSY MICOM ATZ W W M HA20W9BGa 1002 628 1 S N A 5 IC115 1107 001561 IC FLASH MEMORY 25VF010 128Kx8Bit SOP 8P 1 S N A 4 C314 2402 001310 C AL SMD 100 ìF 20 35V WT TP 8X10mm 1 S A 4 SUB05 0202 001477 SOLDER CREAM LST309 M D...

Page 46: ...C 1 S N A 2 BOX BN69 01356A BOX 02 SET LS20HAW_HAS SY 03 A YEL A1 W5 1 02 S N A 2 T0081 BN96 02895A ASSY MISC P HANDLE PACKING ALL MODEL BN6 1 S N A 3 M0103 BN66 00007A LEVER TOP ALL MODEL LDPE WHITE 1 S N A 3 M0102 BN66 00008A LEVER BOTTOM ALL MODEL LDPE WHITE 1 S N A 0 1 BN91 01303M ASSY LCD ATZ LS20HAWCSZ 4LAMP 1 S N A 2 M0215 BN07 00402A LCD PANEL M201EW02 V8 Doppler 6bit Hi FR 1 S A 0 1 M0019...

Page 47: ...6 Electrical Parts List 6 8 Memo ...

Page 48: ...7 Block Diagrams 7 1 7 Block Diagram ...

Page 49: ...7 Block Diagrams 7 2 ...

Page 50: ...8 Wiring Diagram 8 1 8 Wiring Diagram Connected to the I P board Connected to the Panel through the LVDS cable For DVI signal For Analog signal For function key For test not used ...

Page 51: ...8 Wiring Diagram 8 2 Memo ...

Page 52: ...pliances and Underwriters Laboratories UL Publication UL1410 59 7 Figure 1 1 Leakage Current Test Circuit 4 With the unit completely reassembled plug the AC line cord directly into a 120V AC outlet With the unit s AC switch first in the ON position and then OFF measure the current between a known earth ground metal water pipe conduit etc and all exposed metal parts including metal cabinets screwhe...

Page 53: ...e AC source and turn the power switch ON Connect an insulation resistance meter 500 V to the blades of the AC plug The insulation resistance between each blade of the AC plug and accessible conductive parts see above should be greater than 1 megohm 6 Always connect a test instrument s ground lead to the instrument chassis ground before connecting the positive lead always remove the instrument s gr...

Page 54: ...ct it from being exposed to moisture Otherwise it may cause a fire or electric shock 5 Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product Also check the antenna cable or the external connectors if they are fully unplugged Damage to the cord may cause fire or electric shock 6 Keep the antenna far away from any high voltage cables and install i...

Page 55: ...1 Precautions 1 4 Memo ...

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