Samsung LME20AS Service Manual Download Page 34 | Manualshive

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4 Troubleshooting

4-3

Is pin9 of

CN700(BKLT_EN)high(3.3V)?

4-2 No Video (PC Analog Signal)

5

Check TFT_LCD panel or inverter

and connection between then.

Yes

No

Does the analog video signal
appear at R104, R105, R106

(Red,Green,Blue)?

Check pc signal.

Yes

No

Does the X710

oscilate Properly?

Check the X300.

No

Yes

Replace LCD Panel.

6

7

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Summary of Contents for LME20AS

Page 1: ...Monitor Fashion Feature LCD Monitor Chassis Model LME20WS 206BW LME22WS 226BW LME20AS 206NW LME22AS 226NW LME22VS 216BW 223BW Magic Bright Magic Color Integrated UI applied Hidden Function Key Lustrous Appearance Design ...

Page 2: ... Samsung Electronics Co Ltd LME20WS LME22WS LME20AS LME22AS LME22VS Service Manual First edition December 2006 Printed in Korea Trademarks Samsung is the registered trademark of Samsung Electronics Co Ltd LME20WS LME22WS LME20AS LME22AS LME22VS and MacMaster Cable Adapter are trademarks of Samsung Electronics Co Ltd Macintosh Power Macintosh are trademarks of Apple Computer Inc All other trademark...

Page 3: ...E22VS Specifications 2 6 2 8 Spec Comparison 2 7 2 9 Option Specification 2 8 3 3 Alignments and Adjustments 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 ...

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 00138M 03 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: ...l 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 For documentations or works involving heavy text 3 Internet For working with a mixture of images such as text and graphics 4 Game For watching motion pi...

Page 7: ...nter Auto adjustment allows the monitor to self adjust to the incoming video signal The values of fine coarse and posi tion are adjusted automatically Available in ana log mode only 6 Power button Use this button for turn the monitor on and off 1 POWER port Connect the power cord for your monitor to the power port on the back of the monitor 2 DVI IN HDCP port Connect the DVI Cable to the DVI port ...

Page 8: ...ng 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 A ...

Page 9: ...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 1 2 4 3 ...

Page 10: ...itors 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 Description Picture Description 1 Remove 3 screws from the stand and Remove stand 2 Remove 3 screws from the stand and Lift up back cover ...

Page 11: ...ure Description 4 Use the jig to remove the shield lamp Be careful Shield 5 Remove the FUNCTION Wire from PCB ASS Y 6 Remove the Panel Lamp wire 7 Remove the LVDS Wire from Panel 8 Remove 4 screws 9 Remove 4 screws and Lift up the Main PCB and IB Board ...

Page 12: ...11 Disassembly and Reassembly 11 3 10 Main PCB and IB Board Description Picture Description ...

Page 13: ...11 Disassembly and Reassembly 11 4 11 2 Reassembly Reassembly procedures are in the reverse order of disassembly procedures ...

Page 14: ...13 Circuit Descriptions 13 1 13 Circuit Descriptions 13 1 Block description SDRAM Memory scaler Flash memory EEPROM EEPROM FET Array ...

Page 15: ...13 Circuit Descriptions 13 2 Memo ...

Page 16: ...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 17: ...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 18: ... to the DVI port on the back of your monitor 2 3 Connected to a Macintosh Connect the monitor to the Macintosh computer using the D SUB connection cable 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 simultaneously both the D Sub and DVI cables to one computer...

Page 19: ...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 20: ...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 21: ...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 22: ...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 23: ... 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 24: ...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 25: ...Memo 14 Reference Infomation 14 10 ...

Page 26: ...ontrast to 0 Then press the Enter Source key for 5 second Service function OSD will appear on screen 2 Press the key to place the cursor on the panel Press the menu key for 5 seconds 3 5 OSD Adjustment When Replacing Lamp Only 1 Adjust brightness and contrast to 0 Then press the exit key for 5 seconds Service function OSD will appear on the screen 2 Press the key Select upper lamp and press the me...

Page 27: ... 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 28: ...ashing 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 locked...

Page 29: ...Program 1 Winddc exe Program install in PC 2 Cilck the Winddc icon 3 File open 4 Select Port 1 Load DDC fileFile Name 206BW 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 30: ...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 31: ...Memo 3 Alignments and Adjustments 3 6 ...

Page 32: ...N700 Check the IP Board There is no light in the power indicator Check IC310 Yes No Does proper DC 5V appear at Output of C719 Check the IC702 Yes No Does proper DC 3 3V appear at Pin 4 of the IC705 Check the IC705 No Yes Yes Does proper DC 1 8V appear at Pin 2 of the IC703 Check the IC703 No 1 2 3 4 ...

Page 33: ...4 Troubleshooting 4 2 WAVEFORMS 2 1 3 4 ...

Page 34: ...No Video PC Analog Signal 5 Check TFT_LCD panel or inverter and connection between then Yes No Does the analog video signal appear at R104 R105 R106 Red Green Blue Check pc signal Yes No Does the X710 oscilate Properly Check the X300 No Yes Replace LCD Panel 6 7 ...

Page 35: ...4 Troubleshooting 4 4 WAVEFORMS 6 5 7 ...

Page 36: ... Pin9 of CN700 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 R200 R227 Check PC signal Yes No 9 Replace LCD Panel ...

Page 37: ...4 Troubleshooting 4 6 WAVEFORMS 9 5 ...

Page 38: ...4 Troubleshooting 4 7 ...

Page 39: ...4 Troubleshooting 4 8 ...

Page 40: ...4 Troubleshooting 4 9 ...

Page 41: ...Memo 4 Troubleshooting 4 10 ...

Page 42: ...30mm 1 S A 2 M0125 BN39 00246F CBF SIGNAL DVI D 1703FP 24P 24P 20276 D 1 S A 2 M0027 BN96 04541A ASSY STAND P BASE LS20MEW ABS HB BK26 BK 1 S A 3 M0081 6003 001001 SCREW TAPTITE FH B M3 L8 ZPC BLK SWRC 4 S N A 3 M0142 BN61 00251A FOOT RUBBER GH17BS RUBBER T1 6 4 S N A 3 BN61 01235A SUPPORT BRKT BASE MJ19AS BS SECC T1 6 1 S N A 3 CIS4 BN61 01717A HOLDER STAND BIZET NI PLT CH M4 L11 5 1 S A 3 BN63 0...

Page 43: ...6 Electrical Parts List 6 2 Memo ...

Page 44: ...7 Block Diagrams 7 1 7 Block Diagram 7 1 Block Diagram ...

Page 45: ...7 Block Diagrams 7 2 Memo ...

Page 46: ...9 Schematic Diagrams 9 1 9 Schematic Diagrams This Document can not be used without Samsung s authorization 9 1 Schematic Diagrams ...

Page 47: ...9 Schematic Diagrams 9 2 This Document can not be used without Samsung s authorization ...

Page 48: ...9 Schematic Diagrams 9 3 This Document can not be used without Samsung s authorization ...

Page 49: ...9 Schematic Diagrams 9 4 Memo ...

Page 50: ...iew Parts List 5 1 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 LS22MEVSFV EDC Exploded View M0215 M0013 M0006 M0006 M0027 M0113 ...

Page 51: ...LCD PANEL CLAA220WA01 Mendel 6bit Hi FRC 1 S A M0013 BN96 04544B ASSY COVER P REAR LS22MEV HIPS HB BK07 1 S A M0006 BN63 02915A COVER REAR LS22MEW HIPS HB BK07 1 S N A M0113 BN61 02806A BRACKET VESA LS20MEW SECC T1 0 2 S N A M0006 BN63 02916A COVER REAR SUB LS22MEW HIPS HB BK07 1 S A M0027 BN96 04541A ASSY STAND P BASE LS20MEW ABS HB BK2 1 S A ...

Page 52: ...9 Schematic Diagrams 9 1 9 Schematic Diagrams This Document can not be used without Samsung s authorization 9 1 Schematic Diagrams ...

Page 53: ...9 Schematic Diagrams 9 2 This Document can not be used without Samsung s authorization ...

Page 54: ...9 Schematic Diagrams 9 3 This Document can not be used without Samsung s authorization ...

Page 55: ...9 Schematic Diagrams 9 4 Memo ...

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