AOC L1740 Series Service Manual
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AOC L1740 Series Service Manual

17” lcd monitor
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HP L1740
SERVICE MANUAL
17" LCD Monitor
L1740 Series
THESE DOCUMENTS ARE FOR 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.
1

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Summary of Contents for AOC L1740 Series

  • Page 1 HP L1740 SERVICE MANUAL 17” LCD Monitor L1740 Series THESE DOCUMENTS ARE FOR 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...

  • Page 2: Table Of Contents

    HP L1740 Table of Contents Revision List ------------------------------------------------------------------------------------------------------------------------------ 03 1.Product Feature ------------------------------------------------------------------------------------------------------------------------04 2.LCD Monitor Description ------------------------------------------------------------------------------------------------------------05 3.Operation Instructions ---------------------------------------------------------------------------------------------------------------05 3.1 General Instructions ---------------------------------------------------------------------------------------------------------------05 3.2 Control Button ---------------------------------------------------------------------------------------------------------------------06 3.3 Adjusting The Picture -------------------------------------------------------------------------------------------------------------06 4. Input/Output Specification -------------------------------------------------------------------------------------------------------- 09 4.1 Input Signal Connector -----------------------------------------------------------------------------------------------------------09 4.2 Factory Preset Display Modes --------------------------------------------------------------------------------------------------11 4.3 Power Supply Requirements ----------------------------------------------------------------------------------------------------11 5.Panel Specification ---------------------------------------------------------------------------------------------------------------------12...

  • Page 3: Revision List

    HP L1740 Revision List Version Date Revision History TPV Model Name Dec.-27-05 Initial release T781KCMDKHHPNP Apr.-25-07 Lead in the second panel source T781KAMDKHHPNP...

  • Page 4: Product Feature

    HP L1740 1. Monitor Specifications Items Descriptions Driving system TFT Color LCD Panel CLAA170EA07Q Size 337.920(H) x 270.336(V) (17.0") Pixel pitch 0.264mm( W )x 0.264mm( H ) LCD Panel Viewable angle 120/140 Response time (typ.) < 16 ms Brightness (MIN) 200 nits Contrast Ratio (MIN) 250/1...

  • Page 5: Lcd Monitor Description

    HP L1740 2. LCD Monitor Description The LCD Monitor will contain main board, power board, key board and which house the flat panel control logic, brightness control logic and DDC. The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage.

  • Page 6: Control Button

    HP L1740 3.2 Control Buttons Power Indicator: Green — Power On mode. Orange — Power Saving mode. Blank —Power Off Mode. Auto Adjust : Activates the auto adjustment feature for optimum image. Menu : Opens the ON-Screen Display(OSD) menu. Minus (–) : 1、If OSD is on, press to navigate backward through the OSD menu features and decrease adjustment levels.
  • Page 7 HP L1740 Service Mode Press and hold the “Menu” button, Power off -> on “Power”,then into the service mode, Press “menu” button to bring to OSD menu for confirmation as below: Factory Mode 1、 Turn ojiff monitor. 2、 [ Push “Auto Adjust” and “+ (plus)”and hold them at the same time ]+ [ Press power “Power” button untill comes out “windows screen”...
  • Page 8 HP L1740 Menu Icons Control Icon Brightness Contrast Auto Adjustment Image Control Color Custom Color Language Management OSD Control Information Factory Reset Default Video Input Horizontal Position Vertical Position Clock Clock Phase Power Saver Mode Display Power-On Status Display Sleep Timer Basic Menu Advanced Menu Power On Recall...

  • Page 9: Input/Output Specification

    HP L1740 4. Input/Output Specification 4.1 Input Signal Connector Analog Connector Pinout Mnemonic Signal Mnemonic Signal Red Video +5 V +5 V (from PC) Green Video Sync Ground Blue Video None None DDC Data GND (DDC Return) Horizontal Sync Red GND Vertical Sync Green GND DDC Clock...
  • Page 10 HP L1740 DVI-D Digital Connector Pins Pin. Mnemonic Signal Pin. Mnemonic Signal TX 2 - TMDS Negative differential input, channel 2 13 TX 3 + TMDS Data 3 + TX 2 + TMDS Positive differential input, channel 2 +5V Power Ground (Return for +5V, SHLD 2 / 4 Shield for TMDS channels 2 / 4...

  • Page 11: Factory Preset Display Modes

    HP L1740 4.2 Factory Preset Display Modes Pixel Horz Freq Horz Vert Freq Vert Pixel Clk Preset Format (KHz) Polarity (Hz) Polarity (MHz) Source 640 x 480 31.469 59.940 25.175 640 x 480 37.861 72.809 31.500 VESA 640 x 480 37.500 75.000 31.500...

  • Page 12: Panel Specification

    HP L1740 5. Panel Specification 5.1 General Feature...

  • Page 13: Optical Characteristics

    HP L1740 5.2 Optical Characteristics Ta= 25°C, V LCD =5.0V...

  • Page 14: Monitor Exploded View

    HP L1740 6. Monitor Exploded View...

  • Page 15: Repair Flow Chart

    HP L1740 7. Repair Flow Chart...
  • Page 16 HP L1740...
  • Page 17 HP L1740...

  • Page 18: Troubleshooting

    HP L1740 8. Troubleshooting Problem Possible Cause Solution Screen is blank. Power cord is disconnected. Connect the power cord. Power switch is turned Off. Turn on the power. Video cable is improperly connected. Connect the video cableproperly. Screen blanking utility is active. Depress any key on the keyboard or moveThe mouse to inactivate the screen blanking Utility.

  • Page 19: Block Diagram

    HP L1740 9. Block Diagram...

  • Page 20: Schematic

    HP L1740 10. Schematic 10.1 Main Board...
  • Page 21 HP L1740...
  • Page 22 HP L1740...
  • Page 23 HP L1740...
  • Page 24 HP L1740...

  • Page 25: Inverter/Power Board

    HP L1740 10.2 Power Board (include inverter and power) AC/DC Schematic...
  • Page 26 HP L1740 Inverter Schematic...
  • Page 27 HP L1740 AC/DC Function Block Schematic...
  • Page 28 HP L1740 Inverter Function Block Schematic...

  • Page 29: Key Board

    HP L1740 10.3 Key Board...

  • Page 30: Pcb Layout

    HP L1740 11. PCB Layout 11.1 Main Board...

  • Page 31: Inverter/Power Board

    HP L1740 11.2 Inverter / Power Board Bottom Layer...
  • Page 32 HP L1740 Bottom Silk Screen Overlayer...
  • Page 33 HP L1740 Top Silk Screen Overlayer...

  • Page 34: Key Board

    HP L1740 11.3 Key Board...

  • Page 35: Maintainability

    HP L1740 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.

  • Page 36: White-Balance, Luminance Adjustment

    HP L1740 13. White - Balance, Luminance Adjustment Approximately 30 minutes should be allowed for warm up before proceeding White-Balance adjustment. 1. How to do the Chroma-7120 MEM .Channel setting A. Reference to chroma 7120 user guide B. Use “ SC” key and “ NEXT” key to modify xyY value and use “ID” key to modify the TEXT description Following is the procedure to do white-balance adjust 2.
  • Page 37 HP L1740 2. The chroma 7120 will show x = 313 ±20, y = 329 ±20, Y = 180 cd/m 3. Switch the chroma 7120 l to RGB MODE ( with press “MODE” button to change ) 4. Adjust the RED of color 6500K on factory window until chroma 7120 indicator reached the value R=100 5.

  • Page 38: Check List After Replacing Lcd Main Board

    HP L1740 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±...
  • Page 39 HP L1740 2. Select the 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.
  • Page 40 HP L1740 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. 14 . EDID4.6 DDC application provides the function selection and text change (select & fill out)from Step 1 to Step 9.
  • Page 41 HP L1740 Step 4: Modify DDC data (Monitor Serial No.) 1. Click Next , bring up Fig. 15. 2. Click Next , bring up Fig.16.
  • Page 42 HP L1740 3. Click Next , bring up Fig.17. 4. Click Next , bring up Fig.18.
  • Page 43 HP L1740 5. Click Next , bring up Fig.19. 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.
  • Page 44 HP L1740 7. Click Next, bring up Fig. 21. 8. Click Next , bring up Fig. 22. - Click Finish to exit 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.
  • Page 45 HP L1740 Step 5: Write DDC data 1. Configuration should be as Fig. 23. 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"] =>...
  • Page 46 HP L1740 Step 6: Save DDC data Sometimes, you may need to save DDC data as a text file for using in other IC chip. To save DDC data, follow the steps below: 1. Click (Save) icon (or click "file"-> "save as") from the tool bar and give a file name as shown in Fig. 25. The file type is EDID46 file (*.ddc) which can be open in WordPad.
  • Page 47 HP L1740 Step 8: Turn off the monitor, exit the factory mode. Re-programming Digital DDC IC Step 1: After initialize alignment box, connecting all cables and box as shown in Fig. 27. 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.
  • Page 48 HP L1740 2. Select the DDC2Bi as the communication channel. As shown in Fig. 29. 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.
  • Page 49 HP L1740 Step 4: Modify DDC data (Monitor Serial No.) 1. Click Next , bring up Fig. 32. 2. Click Next , bring up Fig. 33. Fig. 33 Fig. 34 3. Click Next , bring up Fig. 34. 4. Click Next , bring up Fig. 35. 5.
  • Page 50 HP L1740 7. Click Next , bring up Fig. 38. 8. Click Next , bring up Fig. 39. - Click Finish to exit 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.
  • Page 51 HP L1740 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"...
  • Page 52 HP L1740 1. Click (Save) icon (or click "file"-> "save as") from the tool bar and give a file name as shown in Fig. 46. The file type is EDID46 file (*.ddc) which can be open in WordPad. By using WordPad, the texts of DDC data & table (128 bytes, hex code) can be modified.

  • Page 53: Edid Content

    HP L1740 15. EDID Content Analog 16 : 32 : 48 : 64 : 80 : 96 : 112: Digital 16 : 32 : 48 : 64 : 80 : 96 : 112:...

  • Page 54: Bom List

    HP L1740 16. BOM List T781KCMDKHHPNP Location Part No. Description 034G6392 EY B REAR COVER 037G6057 1 HINGE 040G 58169016A TCO'03 LABEL 041G7800690A14 GUIDE QUICK SETUP-NA/API 041G7800690A15 FRONT COVER 044G3231 15571 EVA WASHER 044G3793 1 CUSHION-L 044G3793 2 CUSHION-R 052G 1185 MIDDLE TAPE 052G...
  • Page 55 HP L1740 8161 095G8014 7507 CBLE-017 7/360/7-017 AWG28 Q52G6025 13 47 INSULATE SHEET E750L 750GLB70A7Q11Z000H CTOC 272 ZBD PANEL E750L 750GLB70A7Q21Z000H CTOC 2A2 ZBD PANEL E750L 750GLC70A7Q12Z CPT 17" 272 ZBD PANEL E750L 750GLC70A7Q13Z CPT 17" 272 ZBD PANEL E750L 750GLC70A7Q22Z CPT 17"...
  • Page 56 HP L1740 7505 056G 158805 IC L5972D013TR S08 7401 056G 562512 NT68563EFG 7506 056G 563 27 IC1117A-18PYTR-R AIC 7302 056G1125177CH1 NT68F631ALG PLCC-44 7601 056G1133520CH3 IC AT25040AN-10SU-2.7 ATMEL 7602 056G1142 4 CY7C65640A-LFXC 7210 056G4LCX 14 PH IC 74LVC14APW PHILIPS 7210 056G4LCX 14 ST IC SM 74LCX14T 7210 056G4LVC 14 TI...
  • Page 57 HP L1740 3208 061G0603000 RST CHIPR 0 OHM +-5% 1/10W 3507 061G0603101 RST CHIPR 100 OHM +-5% 1/10W 3513 061G0603101 RST CHIPR 100 OHM +-5% 1/10W 3626 061G0603101 RST CHIPR 100 OHM +-5% 1/10W 3314 061G0603101 RST CHIPR 100 OHM +-5% 1/10W 3313 061G0603101 RST CHIPR 100 OHM +-5% 1/10W...
  • Page 58 HP L1740 3503 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W 3511 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W 3512 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W 3522 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W 3523 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W 3524 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W...
  • Page 59 HP L1740 3330 061G0603472 RST CHIPR 4.7KOHM +-5% 1/10W 3327 061G0603472 RST CHIPR 4.7KOHM +-5% 1/10W 3328 061G0603472 RST CHIPR 4.7KOHM +-5% 1/10W 3329 061G0603472 RST CHIPR 4.7KOHM +-5% 1/10W 3326 061G0603473 RST CHIPR 47 KOHM +-5% 1/10W 3521 061G0603562 RST CHIPR 5.6 KOHM +-5% 1/10W 3233 061G0603750 9F...
  • Page 60 HP L1740 2415 065G0603104 12 CER2 0603 X7R 16V 100N P 2414 065G0603104 12 CER2 0603 X7R 16V 100N P 2411 065G0603104 12 CER2 0603 X7R 16V 100N P 2520 065G0603104 12 CER2 0603 X7R 16V 100N P 2622 065G0603104 12 CER2 0603 X7R 16V 100N P 2621 065G0603104 12...
  • Page 61 HP L1740 2403 065G0603104 12 CER2 0603 X7R 16V 100N P 2402 065G0603104 12 CER2 0603 X7R 16V 100N P 2304 065G0603104 12 CER2 0603 X7R 16V 100N P 2301 065G0603104 12 CER2 0603 X7R 16V 100N P 2256 065G0603104 12 CER2 0603 X7R 16V 100N P 2255 065G0603104 12...
  • Page 62 HP L1740 5506 071G 57G800 FT CHIP BEAD TI321611G800 FRONTIER 5602 071G 57G800 FT CHIP BEAD TI321611G800 FRONTIER 5604 071G 57G800 FT CHIP BEAD TI321611G800 FRONTIER 5606 071G 57G800 FT CHIP BEAD TI321611G800 FRONTIER 5612 071G 57G800 FT CHIP BEAD TI321611G800 FRONTIER 5606 071G 57K101 B CHIP BEAD HCB3216KF-101T30 BULLWILL...
  • Page 63 HP L1740 1931 033G3802 7 WAFER EH 7 3935 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W 3934 061G0603472 RST CHIPR 4.7KOHM +-5% 1/10W 3933 061G0603473 RST CHIPR 47 KOHM +-5% 1/10W 1932 077G 604 1 AL SWI TACT SM 1P 1POS SKQGAB R 1933 077G 604 1 AL SWI TACT SM 1P 1POS SKQGAB R...

  • Page 64: Different Parts List

    HP L1740 17. Different Parts List Diversity of T781KAMDKHHPNP compared with T781KCMDKHHPNP Location Part No. Description 052G 1211 A 165MINIUM TAPE E089A 089G402A19N IS AC POWER CABLE E089A 089G402A19N LS POWER CORD E750L 750GLU70G01 2Z AU 17" V8 ZBD PANEL E750L 750GLU70G0151Z000H PANEL LCD 17"...

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