Samsung 940BW Service Manual

Chassis lha19ws
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SERVICE
LCD Monitor
LCD-Monitor
Chassis
LHA19WS
Manual
Fashion Feature
-Wide Format Display (1440 x 900)
-Response Time Accelerator
-HDCP
-Integrated UI applied
-Connectivity : Analog (15p D-sub),
-Power Consumption: 19"(38W)
-DPMS: under 1 W (230Vac)
Model
940BW
Dual (24p DVI-D)

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Table of Contents
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Summary of Contents for Samsung 940BW

  • Page 1 LCD-Monitor Chassis Model LHA19WS 940BW SERVICE Manual LCD Monitor Fashion Feature -Wide Format Display (1440 x 900) -Response Time Accelerator -HDCP -Integrated UI applied -Connectivity : Analog (15p D-sub), Dual (24p DVI-D) -Power Consumption: 19"(38W) -DPMS: under 1 W (230Vac)
  • Page 2: Table Of Contents

    Contents . Precautions ………………………………………………………………………………………………………………………………………1 1-1 Safety Precautions ……………………………………………………………………………………………………………………… 1-1 1-2 Servicing Precautions …………………………………………………………………………………………………………………… 1-2 1-3 Static Electricity Precautions …………………………………………………………………………………………………………… 1-2 1-4 Installation Precautions ………………………………………………………………………………………………………………… 1-3 . Product specifications …………………………………………………………………………………………………………………………2 2-1 Fashion Feature…………………………………………………………………………………………………………………………… 2-1 2-2 LHA19WS Specifications ………………………………………………………………………………………………………………… 2-1 2-3 Spec Comparison ………………………………………………………………………………………………………………………… 2-2 2-4 Option Specification ………………………………………………………………………………………………………………………...
  • Page 3 Contents 0. Operating Instructions and Installation … … …………………………………………………………………………………………………10-1 10-1 Front …………………………………………………………………………………………………………………………………… 10-1 10-2 Rear……………………………………………………………………………………………………………………………………… 10-2 10-3 Connecting the monitor ……………………………………………………………………………………………………………… 10-3 10-4 Monitor Assembly ……………………………………………………………………………………………………………………… 10-5 10-5 Attaching a Base ……………………………………………………………………………………………………………………… 10-6 1. Disassembly and Reassembly ………………………………………………………………………………………………………………1 11-1 Disassembly (Simple - Stand) ………………………………………………………………………………………………………...
  • Page 4: 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 5: 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 6: 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 high- voltage cable or the antenna falling over may 2.
  • Page 7: Operating Instructions And Installation

    10 Operating Instructions and Installation 10 Operating Instructions and Installation 10-1 Front 1. Menu button For documentations or works involving heavy text. 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 2.
  • Page 8: Rear

    10 Operating Instructions and Installation 4. Enter button / Source button 6. Power button / Power indicator Activates a highlighted menu item. / Use this button for turn the monitor on and off. Push the 'SOURCE', then selects the video signal /This light glows green during nomal operation, while the OSD is off.
  • Page 9: Connecting The Monitor

    10 Operating Instructions and Installation 10-3 Connecting the monitor Rear of monitor New Model Macintosh Rear of Computer Old Model Macintosh 1. 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.
  • Page 10 10 Operating Instructions and Installation 10-3-1 Connecting Digital DVD ¡Ø The monitor has DVI IN connection terminals to connect DVI input devices digital DVD. 1. Input devices such as digital DVD are connected to the DVI IN terminal of the monitor using the DVI cable.
  • Page 11: Monitor Assembly

    10 Operating Instructions and Installation 10-4 Monitor Assembly 10-5...
  • Page 12: Attaching A Base

    10 Operating Instructions and Installation 10-5 Attaching a Base - This monitor accepts a 75mm x 75mm 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 13: 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 TFT-LCD monitors. WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling these components. 11-1 Disassembly (Simple - Stand) Cautions: 1.
  • Page 14 11 Disassembly and Reassembly 3. Lift up the back cover and Use the jig to remove the shield lamp. 4. Disconnect cables. 5. Lift up the shield and disconnect LVDS cable. 11-2...
  • Page 15: Disassembly (Has-Stand)

    11 Disassembly and Reassembly 6. Lift up the LCD panel. 11-2 Disassembly (HAS-Stand) 1. Place monitor face down on cushioned table. Remove 2 screws from the stand and remove front cover. 11-3...
  • Page 16 11 Disassembly and Reassembly 2. Lift up the back cover and Use the jig to remove the shield lamp. 3. Disconnect cables. 4. Lift up the shield and disconnect LVDS cable. 11-4...
  • Page 17: Reassembly

    11 Disassembly and Reassembly 5. Lift up the LCD panel. 11-3 Reassembly Reassembly procedures are in the reverse order of disassembly procedures. 11-5...
  • Page 18: Pcb Diagram

    12 PCB Layout 12 PCB Diagram 12-1...
  • Page 19: C C Ircuit Descriptions

    13 Circuit Descriptions 13 Circuit Descriptions 13-1 Overall Block Structure Power Tree 13-1-1 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 20 13 Circuit Descriptions Main Board Parts 13-1-2 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 of two lines that supports communications for the panel lamp. across the integrated circuits as well as between FLASH and EEPROM.
  • Page 21 13 Circuit Descriptions 13-1-3 IP BOARD BLOCK(POWER) Parts 13-1-4 IP BOARD BLOCK( INVERTER ) Parts I P BO A RD BO A RD B LO C K B LO C K ( I N V N V ERT ER ERT ER ) I N V ERT V ERT ER ER PA RT...
  • Page 22 13 Circuit Descriptions 13-1-5 IP BOARD ( inverter ) PROTECTION Parts BIZET INVERTER CONTROLER FAN7310 have 2-way of the PROTECTION MODE. 1. OVP[Over Voltage Protection] : If the Voltage of the series capacitors C10 & C15 is over the 2.0V, the Inverter latched-off.[See the Picture1] 2.
  • Page 23: Trouble Shooting

    13 Circuit Descriptions 13-2 Trouble Shooting 13-2-1 IP BOARD(Power) Power On Change FUSE Check fuse 3 pin of FDM0565R Check the Vcc system Vcc system in normal: HIGH 1 pin of FDM0565R Check the drain system Check the main switching Normal: Switching Check the Check the...
  • Page 24 13 Circuit Descriptions 13-2-1 IP BOARD(Inverter) Power On Check the power system Check the IC drive 1 and 2 pins of FDM0565R Check MOSFET Check Protection Normal:0.6V~0.8V 1 and 2 pins of FDM0565R Check the OVP and OLR Check Protection circuits Normal:0.6V~0.8V Check any dimming...
  • Page 25: Ip Board(Power) Schematic Diagrams

    13 Circuit Descriptions 13-3 IP BOARD(Power) Schematic Diagrams 13-7...
  • Page 26: Ip Board(Inverter) Schematic Diagrams

    13 Circuit Descriptions 13-4 IP BOARD(Inverter) Schematic Diagrams 13-8...
  • Page 27: 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 28 14 Reference Infomation -Vertical Frequency The screen must be redrawn several times per sec- ond 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. Unit: Hz Example: If the same light repeats itself 60 times per second, this is regarded as 60 Hz.
  • Page 29: 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 30: 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 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 31 14 Reference Infomation Table 2 . Timing Chart Mode 1440/75 Hz 1440/60 Hz 1440x900 1440x900 Timing fH (kHz) 55.935 70.635 A μsec 14.157 17.878 B μsec 1.427 1.112 C μsec 2.178 1.814 D μsec 10.530 13.521 E μsec 0.751 0.702 fV (Hz) 59.887 74.984...
  • Page 32: 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 33: 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 34 14 Reference Infomation Maker VENDOR P/N PANEL_CODE PANEL_ABB STICKER_CODE Remarks LTM170W1-L01 BN07-00112A Color coordinates change 0.280/0.290, 10000k & ZPD Panel LTM170EH-L05 BN07-00113A Color coordinates change 0.280/0.290, 10000k & ZPD Panel LTM220W1-L01 BN07-00114A ZPD Panel for AMLCD 22" TV LTM150XH-L06 BN07-00117A ZPD Panel code LTM153W1-L01 BN07-00118A...
  • Page 35 14 Reference Infomation Maker VENDOR P/N PANEL_CODE PANEL_ABB STICKER_CODE Remarks LTA460W2-L03 BN07-00187A BEETOVEN 46"ZPD new panel LTM240M1-L01 BN07-00195B 24" igh brightness panel ZPD code derivation M170EX-L21 BN07-00206A AMLCD LTM170EX-L21 ZPD new code derivation LTA460H3-L01 BN07-00200A AMLCD 46" LED BLU panel LTM170EU-L15 BN07-00214A AMLCD EU-L15 TV high brightness ZPD new code derivation...
  • Page 36 14 Reference Infomation Maker VENDOR P/N PANEL_CODE PANEL_ABB STICKER_CODE Remarks HANNSTAR HSD170ME13 BN07-00180B Hannstar 17" TN new panel development ZPD code derivation HANNSTAR HSD190ME12 BN07-00210A Hannstar 19" TN new panel development HANNSTAR HSD150MX17-A BN07-00226A Hannstar 15" slim panel ZPD code derivation HANNSTAR HSD190ME12-A10 BN07-00256A...
  • Page 37 14 Reference Infomation Maker VENDOR P/N PANEL_CODE PANEL_ABB STICKER_CODE Remarks HYUNDAI HT201V01-100 BN07-00263A Hydis 20.1" 4:3 VGA Mode TN Panel ACER L170E3 BN07-00044A TN(ADT) ACER M170EN05 BN07-00076A AU 17" Panel ( Narrow & slim design ) ACER M170EN05 BN07-00102A ZPD Panel code ACER M190EN02 BN07-00170A...
  • Page 38 14 Reference Infomation Maker VENDOR P/N PANEL_CODE PANEL_ABB STICKER_CODE Remarks CHIMEI V320B1-L01 BN07-00207A CMO 32" development CHIMEI V270W1-L01 BN07-00136A CHI MEI 27" panel development CHIMEI M190E5-L0A BN07-00213A CHIMEI M190E3-L0A BN07-00212A CMO M190E3-L0A MVA Type new code CHIMEI M170E7-L01 BN07-00232A CMO 17" Slim TN ZPD Type new code CHIMEI M190A1-L01 BN07-00228A...
  • Page 39: Product Specifications

    2 Product Specifications 2 Product Specifications 2-1 Fashion Feature - Wide Format Display (1440 x 900) - HAS/SIMPLE Stand - Silver/Black Color Variation - Response Time Accelerator - HDCP 2-2 LHA19WS Specifications Description Item LCD Panel TFT-LCD panel, RGB vertical stripe, normally white transmissive, 19-Inch viewable, 0.285 (H) x 0.285 (V) mm pixel pitch Scanning Frequency Horizontal : 30 kHz ~ 81 kHz (Automatic)
  • Page 40: Spec Comparison

    2 Product Specifications 2-5 Spec Comparison LHA19WS LHA19BS Model 940BW 940B Design Screen Size 19" 19" Wide 300cd/㎡ 300cd/㎡ Brightness Contrast 600:1 800:1 Fast Response 8ms / 4ms(G to G) Time Magic Pivot Magic Tune Ver 3.6 Ver 3.6 Sharpness...
  • Page 41: Option Specification

    2 Product Specifications 2-6 Option Specification Item Item Name CODE.NO Remark Quick Setup Guide BH68-00376L Warranty Card (Not available in all loca- BH68-70438A tions) User's Guide, Monitor Driver, BN59-00509D Natural Color software, MagicTune software D-Sub(15 Pin) BN39-00244B Cable Power Cord 3903-000042 DVI Cable BN39-00246F...
  • Page 42: 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 and program memory (IC110) change. 3-1 Required Equipment The following equipment is necessary for adjusting the monitor: Computer with Windows 95, Windows 98, or Windows NT.
  • Page 43: Service Function Spec

    3 Alignments and Adjustments 3-6 Service Function Spec. 3-6-1 How to Display Service Function OSD 1. The value for brightness and contrast should be changed to zero. 2. Within 5 seconds, press the (Enter/Source) key. 3. Service function OSD will be displayed. If you want to disable the service function OSD, you will have to power off.
  • Page 44 3 Alignments and Adjustments 3-6-3 How to Control Service Function OSD After change the panel or lamp, you must reset service function OSD. The case of panel change After changeing the panel, press the menu key within 5 seconds,. Then, panel Ch. No increases one step and the panel time information is reset to zero. Simultaneously, other information is reset to zero (Upper/Lower lamp, Panel cycle).
  • Page 45: How To Execute Ddc

    3 Alignments and Adjustments 3-7 How to execute DDC 1. Open file. 2. Select Port #1. 3. Select DDC file. 4.Click, "Next" Button 5. Type in the monitor serial number and press Enter. *Repeat this step 2 to 5 times in digital inputs after the analog input.
  • Page 46: Troubleshooting

    4 Troubleshooting 4 Troubleshooting Notes: 1. Before troubleshooting, setup the PC 's display as below. • Resolution: 1440 x 900 • H-frequency: 56 kHz • V-frequency: 75 Hz 2. If no picture appears, make sure the power cord is correctly connected. 3.
  • Page 47: No Video (Analog)

    4 Troubleshooting 4-2 No Video (ANALOG) Check signal cable connection and power. X1 oscillate proprely? Replace or check related circuit. Is there R,G,B input at Check input part. R111,R114 and R118? Is there Hsync, Vsync waveform Check IC604 and related circuit. at Pin 32,33 of IC604? Does the output signal appear Check CN400 and related circuit.
  • Page 48 4 Troubleshooting WAVEFORMS...
  • Page 49: No Video (Digital)

    4 Troubleshooting 4-3 No Video (DIGITAL) Check signal cable connection and power. Replace or check related circuit. X1 oscillate properly? Is there R, G, B input at Check input part. R100,R101,R102,R106 and R108? Does the output signal appear Check IC400 and related circuit. at Pin 17~20, 22~27 of CN400? Check the PANEL_EN signal at R222...
  • Page 50 4 Troubleshooting WAVEFORMS...
  • Page 51: Exploded View And Parts List

    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 5-2 LHA19BS Exploded View(LOWEST HAS STAND TYPE) M0215 M0006 T0003 M0014 M0013...
  • Page 52 5 Exploded View & Parts List - Parts list Location Code.No Item & Specification Q'ty SA/SNA Remark T0003 BN96-03337A ASSY COVER P-FRONT;LS19HAW (940BW),ABS H M0112 BN63-02515A COVER-FRONT;S/M 940BW,ABS,HB,BK24 S.N.A T0022 BN64-00377A KNOB CONTROL;HA17TS,PC CLEAR+SMOG,T2.1,9 S.N.A M0145 BN96-03255A ASSY BOARD P-FUNCTION;Mendel,CT5000-4030...
  • Page 53: E E Lectrical Parts List

    Level Loc. No. Code No. Description & Specification Q'ty SA/SNA LS19HAWCSQ/EDC 940BW,WGA1/S19B4-LHA,19,LCD-MO,NETHERLAN M0001 BN90-00905B ASSY COVER FRONT;CTZ-LS19HAWCSQ/EDC S.N.A T0003 BN96-03337B ASSY COVER P-FRONT;LS19HAW (940BW),ABS H ...3 M0112 BN63-02515B COVER-FRONT;LS19HAW(940BW),ABS,HB,GR70,S S.N.A ...3 T0022 BN64-00377B KNOB CONTROL;HA17TS,PC CLEAR,T2.1,9,112, S.N.A ...3 M0145 BN96-03255A ASSY BOARD P-FUNCTION;Mendel,CT5000-4030...
  • Page 54 CARD-12,BLOC WARRANTY;TFT LCD,BASIC,EU,M S.N.A ...3 ACCESSORY BH68-70448A CARD-01;TFT LCD,SRC,RUSSIA,S/W,120,W210* S.N.A ...3 T0059 BN68-00907A MANUAL FLYER-CARD;COMM,SAMSUNG,18 LANG,E S.N.A ...3 M0215 BN96-03059D ASSY MANUAL P-IB+QSG;940BW,SyncMaster,W/ S.N.A ..4 BH68-00376L MANUAL FLYER-04,QSG;LCDQUICK SETUP GUIDE S.N.A ..4 BN59-00509D S/W DRIVER-00,IB;940BW,W/W,SyncMaster,Ha S.N.A M0003 BN92-01728B ASSY BOX;LS19HAWCSQ/EDC S.N.A...
  • Page 55 6 Electrical Parts List Level Loc. No. Code No. Description & Specification Q'ty SA/SNA ..4 IC112 1103-000129 IC-EEPROM;24C02,2Kbit,256x8Bit,SOP,8P,5x ..4 IC112 1103-001023 IC-EEPROM;24C08,8Kbit,1Kx8Bit,SOP,8P,5x4 ..4 T0087 1203-002844 IC-POSI.FIXED REG.;AP1117D-18A,TO-252-3L ..4 T0087 1203-003695 IC-POSI.FIXED REG.;NCP1117ST33T3G,SOT-22 ..4 R100 2007-000071 R-CHIP;22ohm,5%,1/10W,TP,1608 ..4 R101 2007-000071 R-CHIP;22ohm,5%,1/10W,TP,1608 ..4 R102 2007-000071...
  • Page 56 6 Electrical Parts List Level Loc. No. Code No. Description & Specification Q'ty SA/SNA ..4 R125 2007-000090 R-CHIP;10Kohm,5%,1/10W,TP,1608 ..4 R126 2007-000090 R-CHIP;10Kohm,5%,1/10W,TP,1608 ..4 R130 2007-000090 R-CHIP;10Kohm,5%,1/10W,TP,1608 ..4 R131 2007-000090 R-CHIP;10Kohm,5%,1/10W,TP,1608 ..4 R200 2007-000090 R-CHIP;10Kohm,5%,1/10W,TP,1608 ..4 R201 2007-000090 R-CHIP;10Kohm,5%,1/10W,TP,1608 ..4 R210 2007-000090 R-CHIP;10Kohm,5%,1/10W,TP,1608 ..4...
  • Page 57 6 Electrical Parts List Level Loc. No. Code No. Description & Specification Q'ty SA/SNA ..4 C110 2203-005005 C-CER,CHIP;100nF,10%,16V,X7R,1608 ..4 C111 2203-005005 C-CER,CHIP;100nF,10%,16V,X7R,1608 ..4 C112 2203-005005 C-CER,CHIP;100nF,10%,16V,X7R,1608 ..4 C117 2203-005005 C-CER,CHIP;100nF,10%,16V,X7R,1608 ..4 C118 2203-005005 C-CER,CHIP;100nF,10%,16V,X7R,1608 ..4 C119 2203-005005 C-CER,CHIP;100nF,10%,16V,X7R,1608 ..4 C120 2203-005005 C-CER,CHIP;100nF,10%,16V,X7R,1608 ..4...
  • Page 58 6 Electrical Parts List Level Loc. No. Code No. Description & Specification Q'ty SA/SNA ..4 C625 2203-005437 C-CER,CHIP;10000nF,+80-20%,10V,Y5V,3216 ..4 C632 2203-005437 C-CER,CHIP;10000nF,+80-20%,10V,Y5V,3216 ..4 C633 2203-005437 C-CER,CHIP;10000nF,+80-20%,10V,Y5V,3216 ..4 C634 2203-005437 C-CER,CHIP;10000nF,+80-20%,10V,Y5V,3216 ..4 C638 2203-005437 C-CER,CHIP;10000nF,+80-20%,10V,Y5V,3216 ..4 C607 2203-006336 C-CER,CHIP;10000nF,10%,25V,X5R,3216 ..4 C608 2203-006336 C-CER,CHIP;10000nF,10%,25V,X5R,3216 ..4...
  • Page 59: B B Lock Diagram

    7 Block Diagrams 7 Block Diagram 7-1 Power Tree...
  • Page 60: Main Board Part

    7 Block Diagrams 7-2 Main Board Part...
  • Page 61: Ip Board Part (Smps Part)

    7 Block Diagrams 7-3 IP Board Part (SMPS Part)
  • Page 62: Ip Board Part (Inverter Part)

    7 Block Diagrams 7-4 IP Board Part (Inverter Part)
  • Page 63: Wiring Diagram

    8 Wiring Diagram 8 Wiring Diagram...
  • Page 64: S S Chematic Diagrams

    9 Schematic Diagrams 9 Schematic Diagrams - This Document can not be used without Samsung s authorization. 9-1 Schematic Diagrams...
  • Page 65 9 Schematic Diagrams...

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