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HP L1940T

14. Check List after replacing LCD Main board

Check if white-balance is within the specs after replacing Main board and panel, then re-writing DDC is necessary.

14.1 Check white-balance

The white-balance value for each common color temperature:

9300 º K

x=283

20 ; y = 297

20;

6500K

x = 313

20 ; y = 329

20;

sRGB

x = 313

20 ; y = 329

20;

The color temperature value above must be up to the situation of x<y. The value of Y should be confirmed

according to different customers. 15 ”LCD is commonly 180±20cd/cm

（

Center

）

and 17” LCD is required to be

larger than 200cd/cm

(Center). The exact brightness values are confirmed by the checking-regulations of

different customers and different models.

14.2 Steps for writing DDC

：

Re-programming Analog DDC IC

Step 1: After initialize alignment box, connecting all cables a

nd box as shown in Fig. 10.

Step 2: Read DDC data from monitor

1. Click

icon as shown in Fig. 11 from the tool bar to bring up the Channels "Configuration Setup" windows as

shown in Fig. 11.

Содержание L1940T

Страница 1: ...R REPAIR SERVICE INFORMATION ONLY EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES ERRORS OR OMISSIONS SERVICE MANUAL ...

Страница 2: ...irements 11 5 Panel Specification 12 5 1 General Feature 12 5 2 Optical Characteristics 13 6 Monitor Exploded View 14 7 Repair Flow Chart 15 8 Trouble Shooting 18 9 Block Diagram 19 10 Schematic 20 10 1Main Board 20 10 2 Inverter Power Board 25 10 3 Key Board 29 11 PCB Layout 31 11 1 Main Board 31 11 2 Inverter Power Board 32 11 3 Key Board 33 12 Maintainability 34 13 White Balance Luminance Adjus...

Страница 3: ...HP L1940T 3 Revision List Revision Date Revision History TPV Model A00 Feb 24 06 Initial release T981KMVDBHHPNP ...

Страница 4: ...requency 56Hz 76Hz Display Colors Over 16 million Colors Pixel Clock 140MHz Max Resolution 1280 x 1024 Plug Play VESA DDC2BTM Power Consumption ON Mode 70W OFF Mode 1W Sleep Mode 2W Power Source 100 240VAC 47 63Hz Environmental Considerations Operating Temp 5 C to 35 C Storage Temp 20 C to 60 C Operating Humidity 20 to 80 Main Dimensions Unpackaged W H D 413mm 477mm 265mm Packaged W H D 524mm 513m...

Страница 5: ...utton to turn the monitor on or off The other control buttons are located at front of the panel By changing these settings the picture can be adjusted to your personal performance The power cord should be connected Connect the video cable from the monitor to the computer VGA card Press the power button to turn on the monitor the power indicator will light up to Green Video signal DDC Power Board F...

Страница 6: ...ate backward through the OSD menu features and decrease adjustment levels 2 If OSD is off press to enable the DVI signal input available on select models plus 1 If OSD is on press to navigate forward through the OSD menu features and increase adjustment levels 2 If OSD is off press to enable the VGA signal input Power Turns the monitor on or off 3 3 Adjust the Picture Main Menu Press the Menu butt...

Страница 7: ... as below Factory Mode 1 Turn off monitor 2 Push Auto Adjust and plus and hold them at the same time Press power Power button untill comes out windows screen then release all button then press Menu button wait untill the OSD menu with Characters F below OSD menu come on the Screen of the monitor as bellow 3 Pust Menu to exit OSD menu Factory Mode Indicator ...

Страница 8: ...D Control 10 Information 11 Factory Reset 12 Default Video Input 13 Horizontal Position 14 Vertical Position 15 Clock 16 Clock Phase 17 Power Saver 18 Mode Display 19 Power On Status Display 20 Sleep Timer 21 Basic Menu 22 Advanced Menu 23 Power On Recall 24 Horizontal OSD Position 25 Vertical OSD Position 26 OSD Timeout 27 OSD Transparency 28 Exit ...

Страница 9: ...gnal Pin Mnemonic Signal 1 RV Red Video 9 5 V 5 V from PC 2 GV Green Video 10 SG Sync Ground 3 BV Blue Video 11 NC None 4 NC None 12 SDA DDC Data 5 GND GND Cable Detect 13 HS Horizontal Sync 6 RG Red GND 14 VS Vertical Sync 7 GG Green GND 15 SCL DDC Clock 8 BG Blue GND VGA connector layout PIN 1 PIN 5 PIN 11 ...

Страница 10: ...5 GND GND Cable Detect 4 TX 4 TMDS Data 4 16 HPD Hot Plug Detect 5 TX 4 TMDS Data 4 17 TX 0 TMDS Data 0 6 DDC Clk DDC Clock 18 TX 0 TMDS Data 0 7 DDC Data DDC Data 19 SHLD 0 5 TMDS Data 0 5 Shield 8 AVS Analog Vertical Sync 20 TX 5 TMDS Data 5 9 TX 1 TMDS Data 1 21 TX 5 TMDS Data 5 10 TX 1 TMDS Data 1 22 TX CLK SHLD TMDS Clock Shield 11 SHLD 1 3 TMDS Data 1 3 Shield 23 TX CLK TMDS Clock 12 TX 3 TM...

Страница 11: ...ESA 7 800 x 600 46 875 75 000 49 500 VESA 8 832 x 624 49 726 74 551 57 284 MAC 9 1024 x 768 48 363 60 004 65 000 VESA 10 1024 x 768 56 476 70 069 75 000 VESA 11 1024 x 768 60 023 75 029 78 750 VESA 12 1152 x 870 68 68 75 06 100 000 Mac 13 1152 x 900 71 71 76 05 105 561 Sun 14 1280 x 1024 63 98 60 02 108 000 VESA 15 1280 x 1024 79 97 75 02 135 000 VESA 4 3 Power Supply Requirements PARAMETER RANGE ...

Страница 12: ...on 5 1 General Feature Wide viewing angle High contrast ratio Super fast response time High color saturation SXGA 1280 x 1024 pixels resolution DE Data Enable only mode LVDS Low Voltage Differential Signaling interface RoHS Compliance ...

Страница 13: ...HP L1940T 13 5 2 Optical Characteristics Test Conditions Optical Specifications ...

Страница 14: ...HP L1940T 14 6 Monitor Exploded View ...

Страница 15: ...HP L1940T 15 7 Repair Flow Chart ...

Страница 16: ...HP L1940T 16 ...

Страница 17: ...HP L1940T 17 ...

Страница 18: ...Image is not Centered Position may need Adjustment When OSD is inactive press minus button to auto adjust the screen image Press the Menu button to access the Advanced OSD menu Select Image Control Horizontal Position or Vertical Position to adjust the horizontal or vertical position of the image Check Video Cable is displayed on screen Monitor video cable is disconnected Connect the 15 pin monito...

Страница 19: ...HP L1940T 19 9 Block Diagram ...

Страница 20: ...HP L1940T 20 10 Schematic 10 1 Main Board ...

Страница 21: ...HP L1940T 21 ...

Страница 22: ...HP L1940T 22 ...

Страница 23: ...HP L1940T 23 ...

Страница 24: ...HP L1940T 24 ...

Страница 25: ...HP L1940T 25 10 2 Power Board include inverter and power AC DC Schematic ...

Страница 26: ...HP L1940T 26 Inverter Schematic ...

Страница 27: ...HP L1940T 27 AC DC Function Block Schematic ...

Страница 28: ...HP L1940T 28 Inverter Function Block Schematic ...

Страница 29: ...HP L1940T 29 10 3 Key Board ...

Страница 30: ...HP L1940T 30 ...

Страница 31: ...HP L1940T 31 11 PCB Layout 11 1 Main Board ...

Страница 32: ...HP L1940T 32 11 2 Inverter Power Board ...

Страница 33: ...HP L1940T 33 11 3 Key Board ...

Страница 34: ... 12 Maintainability Equipments and Tools Requirement 1 Multi meter 2 Oscilloscope 3 Pattern Generator 4 DDC Tool with an IBM Compatible Computer 5 Alignment Tool 6 LCD Color Analyzer 7 Service Manual 8 User Manual ...

Страница 35: ...ntill comes out windows screen then release all button then press Menu button wait untill the OSD menu with Characters F come on the Screen of the monitor 4 Bias adjustment Set the Contrast to 80 Adjust the Brightness to 90 5 Gain adjustment Move cursor to F and press MENU key A Adjus 9300k color temperature 1 Switch the Chroma 7120 to 9300k channel 2 The chroma 7120 will show x 283 20 y 297 20 Y ...

Страница 36: ...B value meet the tolerance 100 2 C Adjust sRGB color temperature 1 Switch the chroma 7120 to sRGB channel 2 The chroma 7120 will show x 313 20 y 329 20 Y 150 cd m2 3 Switch the chroma 7120 l to RGB MODE with press MODE button to change 4 Adjust the RED of color sRGB on factory window until chroma 7120 indicator reached the value R 100 5 Adjust the GREEN of color sRGB on factory window until chroma...

Страница 37: ...ion of x y The value of Y should be confirmed according to different customers 15 LCD is commonly 180 20cd cm2 Center and 17 LCD is required to be larger than 200cd cm2 Center The exact brightness values are confirmed by the checking regulations of different customers and different models 14 2 Steps for writing DDC Re programming Analog DDC IC Step 1 After initialize alignment box connecting all c...

Страница 38: ...he DDC2Bi as the communication channel As shown in Fig 12 3 Click OK button to confirm your selection 4 Click icon Read EDID function to read DDC EDID data from monitor The EDID codes will display on screen as shown in Fig 13 ...

Страница 39: ...ar Click new function icon from the tool bar bring up Step 1 of 9 as shown in Fig 14 EDID4 6 DDC application provides the function selection and text change select fill out from Step 1 to Step 9 Step 4 Modify DDC data Monitor Serial No 1 Click Next bring up Fig 15 ...

Страница 40: ...HP L1940T 40 2 Click Next bring up Fig 16 3 Click Next bring up Fig 17 ...

Страница 41: ...HP L1940T 41 4 Click Next bring up Fig 18 5 Click Next bring up Fig 19 ...

Страница 42: ...HP L1940T 42 6 Click Next bring up Fig 20 In this step please confirm the Descriptor Data Type is Monitor Range Limits and all the items are same as below 7 Click Next bring up Fig 21 ...

Страница 43: ...t the Step window Serial number can be filled up at this moment for example TWP318Q001 NOTE You must modify the Serial NO In step 9 otherwise the Serial NO In OSD Couldn t be modified correctly Step 5 Write DDC data 1 Configuration should be as Fig 23 And press OK ...

Страница 44: ...een then release all button then press Menu button wait until the OSD menu with Characters F below OSD menu come on the Screen of the monitor see Fig 24 3 Push Menu to exit OSD menu 4 Click Write EDID icon from the tool bar to write DDC data Then the screen will be black for 5 10 seconds when the screen recovers DDC data will be finished Writing Step 6 Save DDC data ...

Страница 45: ...pen in WordPad By using WordPad the texts of DDC data table 128 bytes hex code can be modified If DDC TEXTS HEX Table ar completely correct it can be saved as ddc flie to re load it into DDC IC for DDC Data application 2 Click Save Step 7 Exit DDC program Pull down the File menu and select Exit as shown in Fig 26 Step 8 Turn off the monitor exit the factory mode Re programming Digital DDC IC Step ...

Страница 46: ... 2 Read DDC data from monitor 1 Click icon as shown in Fig 11 from the tool bar to bring up the Channels Configuration Setup windows as shown in Fig 28 2 Select the DDC2Bi as the communication channel As shown in Fig 29 ...

Страница 47: ...splay on screen as shown in Fig 30 Step 3 Modify DDC data verify EDID version week year Click new function icon from the tool bar bring up Step 1 of 9 as shown in Fig 31 EDID46 DDC application provides the function selection and text change select fill out from Step 1 to Step 9 Step 4 Modify DDC data Monitor Serial No 1 Click Next bring up Fig 32 ...

Страница 48: ...3 Click Next bring up Fig 34 4 Click Next bring up Fig 35 5 Click Next bring up Fig 36 6 Click Next bring up Fig 37 In this step please confirm the Descriptor Data Type is Monitor Range Limits and all the items are same as below 7 Click Next bring up Fig 38 ...

Страница 49: ...NO In OSD Couldn t be modified correctly Step 5 Write DDC data 1 Configuration should be as Fig 40 And press OK 2 Access Factory Mode 1 Turn off monitor 2 Push Auto Adjust and plus and hold them at the same time Press power Power button untill comes out Windows screen then release all button then press Menu button wait until the OSD menu with Character F below OSD menu come on the Screen of the mo...

Страница 50: ... Press the Power button to turn off the monitor Press the button again to turn on the monitor 2 Press the Menu button to bring up the OSD main menu 3 Press the Minus button to INFORMATION press the Menu button to confirm your selection 4 Confirm the Serial Number TWP318Q001 is updated as shown in Fig 42 Step 6 Save DDC data Sometimes you may need to save DDC data as a text file for using in other ...

Страница 51: ...n in WordPad By using WordPad the texts of DDC data table 128 bytes hex code can be modified If DDC TEXTS HEX Table ar completely correct it can be saved as ddc flie to re load it into DDC IC for DDC Data application 2 Click Save Step 7 Exit DDC program Pull down the File menu and select Exit as shown in Fig 44 Step 8 Turn off the monitor exit the factory mode ...

Страница 52: ...00 FD 00 38 96 4C 1E 53 0E 00 0A 20 20 20 20 20 20 00 00 00 FC 112 00 48 50 20 4C 31 39 34 30 54 0A 20 20 20 00 3D Digital 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 0 00 FF FF FF FF FF FF 00 22 F0 2F 26 01 01 01 01 16 02 0E 01 03 80 26 1E 78 EE EE 95 A3 54 4C 99 26 32 0F 50 54 AD EF 80 81 80 01 01 01 01 01 01 01 01 48 01 01 01 01 01 01 30 2A 00 98 51 00 2A 40 30 70 64 13 00 52 0E 11 00 00 1E...

Страница 53: ...957 1 CUSHION R 1 000 PCS 452 044G3957 2 CUSHION L 1 000 PCS 450 044G3957690 1A CARTON 1 000 PCS 044G6002757 1A PAPER PLATE 0 050 PCS 044G9003 12 CORNER PAPER 0 050 PCS 044G9003210 CORNER PAPER 0 100 PCS 148 045G 88609 28 BASE P E BAG 1 000 PCS 456 045G 88609 29 P E BAG EPE 1 000 PCS 457 050G 505 2 WRAPPING BAND 1 000 PCS 052G 1185 MIDDLE TAPE FOR CARTON 70 000 CM 052G 1186 SMALL TAPE 8 000 CM 94 ...

Страница 54: ... C LENS POWER 1 000 PCS 034G6401AFH B BEZEL 1 000 PCS 705G980KM34004 MAIN FRAME ASS Y 0 000 015G6343 1 MAIN FRAME LPL 1 000 PCS 052G6025 11981 MYLAR 1 000 PCS CBPC980KMVHPP CONVERSION BOARD 0 000 1503 033G3802 7 WAFER EH 7 1 000 PCS 1502 033G3802 14 14P 2 0MM 1 000 PCS 040G 457624 1B LABEL CPU 1 000 PCS 040G 45762412B CBPC LABEL 1 000 PCS 7302 056G11332PH IC M24C16 WBN6 ST00 L 1 000 PCS 7608 056G1...

Страница 55: ...LLER 1 000 PCS 7401 056G 562 70 GM5321 QFP 208 1 000 PCS 7403 056G 563 27 AIC1117 18PY 1 000 PCS 7202 056G1133 20 AT24C02N 10SU 2 7 1 000 PCS 7203 056G1133 20 AT24C02N 10SU 2 7 1 000 PCS 7202 056G1133 34 M24C02 WMN6TP 1 000 PCS 7203 056G1133 34 M24C02 WMN6TP 1 000 PCS 7301 056G1133519 IC AT49BV002ANT 70JU ATMEL 1 000 PCS 7210 056G4LCX 14 PH IC 74LVC14APW PHILIPS 1 000 PCS 7210 056G4LCX 14 ST IC SM...

Страница 56: ... 1 000 PCS 3340 061L0603101 CHIPR 100 OHM 5 1 16W 1 000 PCS 3401 061L0603101 CHIPR 100 OHM 5 1 16W 1 000 PCS 3402 061L0603101 CHIPR 100 OHM 5 1 16W 1 000 PCS 3505 061L0603101 CHIPR 100 OHM 5 1 16W 1 000 PCS 3506 061L0603101 CHIPR 100 OHM 5 1 16W 1 000 PCS 3507 061L0603101 CHIPR 100 OHM 5 1 16W 1 000 PCS 3206 061L0603101 CHIPR 100 OHM 5 1 16W 1 000 PCS 3207 061L0603101 CHIPR 100 OHM 5 1 16W 1 000 P...

Страница 57: ... 1 000 PCS 3515 061L0603104 RST SM 0603 RC0603 100K PM5 R 1 000 PCS 3209 061L0603104 RST SM 0603 RC0603 100K PM5 R 1 000 PCS 3229 061L0603104 RST SM 0603 RC0603 100K PM5 R 1 000 PCS 3615 061L0603105 RST SM 0603 RC0603 1M PM5 R 1 000 PCS 3621 061L0603105 RST SM 0603 RC0603 1M PM5 R 1 000 PCS 3623 061L0603105 RST SM 0603 RC0603 1M PM5 R 1 000 PCS 3406 061L0603121 CHIPR 120 OHM 1 10W 1 000 PCS 3405 0...

Страница 58: ...PR 0 OHM 5 1 8W 1 000 PCS 2455 065G0603103 32 0 01UF 10 50V X7R 1 000 PCS 2454 065G0603103 32 0 01UF 10 50V X7R 1 000 PCS 2453 065G0603103 32 0 01UF 10 50V X7R 1 000 PCS 2452 065G0603103 32 0 01UF 10 50V X7R 1 000 PCS 2229 065G0603103 32 0 01UF 10 50V X7R 1 000 PCS 2227 065G0603103 32 0 01UF 10 50V X7R 1 000 PCS 2225 065G0603103 32 0 01UF 10 50V X7R 1 000 PCS 2511 065G0603104 12 CER2 0603 X7R 16V ...

Страница 59: ... PM10 R 1 000 PCS 2605 065G0603104 12 CER2 0603 X7R 16V 100N PM10 R 1 000 PCS 2604 065G0603104 12 CER2 0603 X7R 16V 100N PM10 R 1 000 PCS 2603 065G0603104 12 CER2 0603 X7R 16V 100N PM10 R 1 000 PCS 2531 065G0603104 12 CER2 0603 X7R 16V 100N PM10 R 1 000 PCS 2529 065G0603104 12 CER2 0603 X7R 16V 100N PM10 R 1 000 PCS 2525 065G0603104 12 CER2 0603 X7R 16V 100N PM10 R 1 000 PCS 2407 065G0603104 12 CE...

Страница 60: ...2 CER2 0603 X7R 16V 100N PM10 R 1 000 PCS 2416 065G0603104 12 CER2 0603 X7R 16V 100N PM10 R 1 000 PCS 2418 065G0603104 12 CER2 0603 X7R 16V 100N PM10 R 1 000 PCS 2602 065G0603105 A7 1UF 10V Y5V Z 1 000 PCS 2601 065G0603105 A7 1UF 10V Y5V Z 1 000 PCS 2621 065G0603180 31 CAP CC 18PF 25V J NPO 0603 1 000 PCS 2620 065G0603180 31 CAP CC 18PF 25V J NPO 0603 1 000 PCS 2219 065G0603221 31 CER1 0603 NP0 50...

Страница 61: ... PCS 2417 067G 312100 3T SMD 10uf 20 16V 1 000 PCS 2426 067G311F100 3T 10UF 16V 105 PANASONICV TYPE H 1 000 PCS 2439 067G311F100 3T 10UF 16V 105 PANASONICV TYPE H 1 000 PCS 2439 067G311F100 3T 10UF 16V 105 PANASONICV TYPE H 1 000 PCS 2426 067G311F100 3T 10UF 16V 105 PANASONICV TYPE H 1 000 PCS 2425 067G311F100 3T 10UF 16V 105 PANASONICV TYPE H 1 000 PCS 2425 067G311F100 3T 10UF 16V 105 PANASONICV ...

Страница 62: ...CS 5401 071L 56V301 TA BEAD 0805 300OHM 1 000 PCS 5302 071L 56V301 TA BEAD 0805 300OHM 1 000 PCS 5203 071L 56V301 TA BEAD 0805 300OHM 1 000 PCS 5202 071L 56V301 TA BEAD 0805 300OHM 1 000 PCS 5201 071L 56V301 TA BEAD 0805 300OHM 1 000 PCS 5607 071LP57G800 FT TI321611G800 SMD 1 000 PCS 5606 071LP57G800 FT TI321611G800 SMD 1 000 PCS 5605 071LP57G800 FT TI321611G800 SMD 1 000 PCS 5601 071LP57G800 FT T...

Страница 63: ... GS08 1 000 PCS 6221 093G 6432V LL4148 GS08 1 000 PCS 6222 093G 6432V LL4148 GS08 1 000 PCS 1601 093G 22S 51HEC RES XTL SM 12MHZ 32 SMD 49 R 1 000 PCS 1410 093G 22S 53 14 31818MHZ 20PF 1 000 PCS 6209 093G 39S 66 DIO REG SM BZX84 C5V1 PHSE R 1 000 PCS 6209 093G 39S 66 DIO REG SM BZX84 C5V1 PHSE R 1 000 PCS 6222 093G 64S3PH BAS32L 1 000 PCS 6221 093G 64S3PH BAS32L 1 000 PCS 715G1854 1 MAIN BOARD 1 0...

Страница 64: ...HP L1940T 64 1936 077G 604 1 FD SWI TACT 1P 1POS 12V V 1MM5 R 1 000 PCS 6931 081G 14500 KB LED VS SM KAA 3528YSGC KIEL R 1 000 PCS 715G1855 1 KEY BOARD 1 000 PCS ...

Страница 65: ...P AOC Service Manual HP L1940T 模板 C Documents and Settings qiufen mao Application Data Microsoft Templates Normal dotm 标题主题作者关键词备注创建日期 2005 12 26 10 33 00 修订号 160 上次保存日期 2008 1 24 10 34 00 上次保存者 Administrator 编辑时间总计 743 分钟上次打印时间 2008 1 24 10 39 00 打印最终结果页数 64 ...

Страница 66: ...字数 7 349 约字符数 41 893 约 ...

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