HP L1740 Service Manual
17" lcd color monitor
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- User manual (52 pages) ,
- Quickspecs (7 pages) ,
- Specifications (7 pages)
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17" LCD Color Monitor
Service
Service
Service
Description
Table Of Contents......................................................1
Revision List........................................................2
1. Monitor Specification...............................................3
2. LCD Monitor Description........................................4
3. Operation Instruction............................................5
3.1. General Instructions.........................................5
3.2. Control Button......................................................5
3.3 Adjusting the Picture..........................................6
4. Input/Output Specification.......................................7
4.1. Input Signal Connector.........................................7
4.2. Factory Preset Display Modes...........................8
4.3. Power Supply Requirements...............................8
5. Panel Specification.........................................9
5.1. General Feature...............................................9
5.2. Optical Characteristics....................................9
6. Block Diagram.....................................................10
6.1 Software Flow Chart.......................................10
6.2.Electrical Block Diagram...........................12
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING ELECTRONIC
EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
TABLE OF CONTENTS
Page Description
7. Schematic.....................................................14
7.1 Main Board....................................................14
7.2 Power Board...............................................18
8.PCB Layout...............................................20
8.1. Main Board.................................................20
8.2. Power Board..........................................23
8.3. Key Board...............................................26
9. Maintainability................................................27
9.1. Equipments and Tools Requirement..............27
9.2. Trouble Shooting.......................................28
9.2.1 Main Board..........................................28
9.2.2 Power Board.......................................30
9.2.3 Key Board..........................................32
11.Mechanical Instructions.................................35
12. Monitor Exploded View.....................................39
13. BOM List.....................................................40
14. Different Parts List.......................................54
SAFETY NOTICE
1
HP L1740
Horizontal Frequency
24- 83 kHz
Page
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Summary of Contents for HP L1740
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Page 1: Table Of Contents
17" LCD Color Monitor HP L1740 Service Service Service Horizontal Frequency 24- 83 kHz TABLE OF CONTENTS Description Page Description Page 7. Schematic……………........14 Table Of Contents..……......…..1 Revision List.…........……..2 7.1 Main Board..………........14 7.2 Power Board.….……........18 1. Monitor Specification......………..3 8.PCB Layout..……........20 2. LCD Monitor Description……………………………..4 8.1. -
Page 2: Revision List
17" LCD Color Monitor HP L1740 Revision List Version Date Revision History TPV Model Name T77GNNDKCKHFQE Mar.-20-2007 Initial release T77CNNDKCKHFQE T77ANNDKCKHFQE Apr.-06-2007 Add TPVDW Model in Item 14 T76CNNDBCKHPQE 1.Update Layout and BOM May.-23-2007 T77CNNDBCKHFQE 2.Add TPVDW Model in Item 14... -
Page 3: Monitor Specification
17" LCD Color Monitor HP L1740 1. Monitor Specification... -
Page 4: Lcd Monitor Description
17" LCD Color Monitor HP L1740 2. LCD Monitor Description The LCD Monitor will contain main board, power board, a key board 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 5: Operation Instruction
17" LCD Color Monitor HP L1740 3. Operation Instructions 3.1 General Instructions Press the power button 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. -
Page 6: Adjust The Picture
17" LCD Color Monitor HP L1740 3.3 Adjust the Picture 1. If the monitor is not already on, press the Power switch to turn on the monitor. 2. Press the Menu button on the monitor’s front panel to launch the OSD Main Menu. -
Page 7: Input/Output Specification
17" LCD Color Monitor HP L1740 4. Input/Output Specification 4.1 Input Signal Connector 4.1.1 D-SUB connector Signal Signal Red Video 3.3/+5 V (from PC) Green Video Sync Ground Blue Video None None DDC Data Ground (DDC Return) Horizontal Sync Red GND... -
Page 8: Factory Preset Display Modes
17" LCD Color Monitor HP L1740 4.2 Factory Preset Display Modes 4.3 Power Supply Requirements Parameter Range AC Input Voltage 90 to 265V AC Input Frequency 45 to 63 Hz Inrush Current 50A MAX AT 220VAC and 30A AT 120VAC... -
Page 9: Panel Specification
17" LCD Color Monitor HP L1740 5. Panel Specification 5.1 General Feature 5.2 Optical Characteristics... -
Page 10: Block Diagram
17" LCD Color Monitor HP L1740 6. Block diagram 6. 1 Software Flow Chart... - Page 11 17" LCD Color Monitor HP L1740 REMARK: 1) MCU initialize. 2) Is the EEprom blank? 3) Program the EEprom by default values. 4) Get the PWM value of brightness from EEprom. 5) Is the power key pressed? 6) Clear all global flags.
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Page 12: Electrical Block Diagram
17" LCD Color Monitor HP L1740 6.2 Electrical Block Diagram 6.2.1 Scalar Board Crystal (12.000MHz) LCD interface (Y301) (CN302) EEPROM Scalar NT68663MEFG-128 M24C16 (Include MCU, ADC, OSD) (U302) (U401) H sync V sync DCLK+ DCLK- D-Sub DVID Connector Connector (CN201) - Page 13 17" LCD Color Monitor HP L1740 6.2.2 Inverter / Power Board AC input Bridge Rectifier EMI filter Transformer Rectifier diodes and Filter Start Circuit Feedback Over Circuit Voltage Control IC Protect ON/OFF Transformer MOSFET Resonance Lamp Over ON/OFF Feedback Voltage...
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Page 14: Schematic
17" LCD Color Monitor HP L1740 7. Schematic 7.1 Main Board R202 100Ω 1/10W DVI-SCL DVI_5V R203 100Ω 1/10W DVI-SDA ZD202 ZD203 CN202 MM3Z5V6B MM3Z5V6B DDC-DVI-SCL DVI-D-Female FB202 C202 SHELL1 120Ω 0.1uF 50V DDC-DVI-SDA D203 AGND A VS TX2- RX2-... - Page 15 17" LCD Color Monitor HP L1740 CN302 FB302 TXO0- TXO0+ ADC_VAA +3.3V TXO0- TXO1- 120Ω TXO0+ TXO1+ TXO1- TXO2- IICSCL TXO1+ TXO2+ C302 C303 C304 TXO2- 10uF/16V 0.1uF 50V 0.1uF 50V IICSDA TXO2+ TXOC- TXOC- TXOC+ RSTN TXOC+ TXO3- TXO3-...
- Page 16 17" LCD Color Monitor HP L1740 CUT_A CUT_A BRIGHTNESS FB402 R402 R403 BRIGHTNESS 3 C402 0Ω 1/10W 47Ω 1/10W BL_CONTROL R404 R405 BL_CONTROL 3 0Ω 1/10W 47Ω 1/10W CN401 U202 R407 R408 PANEL_IDX AZ1117D-1.8-E1 PANEL_IDX 0Ω 1/10W 10KΩ 1/10W +3.3V +1.8VCC...
- Page 17 17" LCD Color Monitor HP L1740 +3.3V-U USB3V3 +3.3V-U R524 R501 U502 Aug.-25-06 modifychangeS15441DC to A03401L R503 SPICS R502 0Ω 1/10W 0 OHM +-5% 1/4W SPISD R504 0Ω 1/10W R505 15KΩ 1/10W HOLD SPISCK Q502 R506 15KΩ 1/10W R507 0Ω 1/10W...
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Page 18: Power Board
17" LCD Color Monitor HP L1740 7.2 Power Board Philips HPL1940T/L1740 PCB : 715G1821-1/715G1995-1 PT801 C802 CN831 3PF 3KV R834 CONN +12VCC 6.2M 1/2W_NC C803 C801 JUMP R835 10pF/6KV R831 C820 C821 R822 R823 1K 10K_1% 470uF/25V R824 C838 24:24:2400 7.5K_1%_NC... - Page 19 17" LCD Color Monitor HP L1740 Philips HPL1940/L1740 PCB : 715G1821-1/715G1995-1 L902 S901 R931 C8B-R6H_NC spotgap_NC 100 OHM 1/4W R900 C900 C931 R932 680K 0.001uF/250V 100OHM 1/4W 270PF 500V L901 T901 R901 C908 680K +12V VAR901 0.47uF/275V CN901 C901 v aristor_NC...
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Page 20: Pcb Layout
17" LCD Color Monitor HP L1740 8. PCB Layout 8.1 Main Board... - Page 21 17" LCD Color Monitor HP L1740...
- Page 22 17" LCD Color Monitor HP L1740...
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Page 23: Power Board
17" LCD Color Monitor HP L1740 8.2 Power Board... - Page 24 17" LCD Color Monitor HP L1740...
- Page 25 17" LCD Color Monitor HP L1740...
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Page 26: Key Board
17" LCD Color Monitor HP L1740 8.3 Key Board... -
Page 27: Maintainability
17" LCD Color Monitor HP L1740 9. Maintainability 9.1Equipments 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 28: Trouble Shooting
17" LCD Color Monitor HP L1740 9.2 Trouble Shooting 9.2.1 Main Board 1、No power No power Press power key and look if the picture is normal Please reinsert and make sure the AC of 100-240 is normal Reinsert or check the power section Measure U204 PIN 2=3.3V... - Page 29 17" LCD Color Monitor HP L1740 No picture (LED is orange) No picture Measure U204 PIN 2=3.3V U202 PIN 2 =1.8V Replace U204/U202 Y301 oscillate waveforms are normal Replace Y301 Check if the sync signal from computer is output and video cable...
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Page 30: Power Board
17" LCD Color Monitor HP L1740 9.2.2 Power Board 1. No Power No power Check AC line volt 110V or 220V Check AC line Check the voltage of C907(+) Check F901, bridge rectified circuit Check start voltage for the pin8of IC901... - Page 31 17" LCD Color Monitor HP L1740 2. W/LED No Backlight Check C820 (+)/C840 (+) =12V Check C820/C840 Check ON/OFF signal Check Interface board Check U811 pin1=5V ? Change Q821 or Q841 Check the pin1 of U811 have saw tooth wave Change U811 Check D833、D853 has the output of square wave at short time.
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Page 32: Key Board
17" LCD Color Monitor HP L1740 9.2.3 Key Board OSD is unstable or not working Is Keypad board connecting normally? Connect Keypad Board Is Button Switch normally? Replace Button Switch Replace Keypad Board Is Keypad board normally? Check main board... -
Page 33: White-Balance, Luminance Adjustment
6500K color temp. parameter is x = 313±15, y = 329 ±15, Y>180 cd/m 3. Into factory mode of HP L1740 Turn on power, press the down (+) button, pull out the power cord, and then plug the power cord. Then the factory OSD will be at the left top of the panel. - Page 34 17" LCD Color Monitor HP L1740 B. Adjust sRGB color-temperature 1. Switch the chroma-7120 to sRGB channel. 2. The chroma 7120 will show x = 313 ±15, y = 329 ±15, Y >180 cd/m 3. Switch the chroma 7120 l to RGB MODE ( with press “MODE” button to change ) 4.
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Page 35: Mechanical Instructions
17" LCD Color Monitor HP L1740 11. Mechanical Instructions Step Figure Description Lay the monitor on a Preparation flat, soft and clean surface. Remove the decorate cover and the Remove the screws to stand remove the stand. 1. Remove the Bezel 2. - Page 36 17" LCD Color Monitor HP L1740 Remove the Remove the back cover back cover Remove the shield to Remove the remove the main frame main frame...
- Page 37 17" LCD Color Monitor HP L1740 1.Remove the screws marked in red to remove the main board, power baord, Remove main board and power 2.Disconnect board the connector and remove the power board and main board.
- Page 38 17" LCD Color Monitor HP L1740 Remove 1、Remove the panel panel Put this cover up. The machine disconnect The end freely...
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Page 39: Monitor Exploded View
17" LCD Color Monitor HP L1740 12. Monitor Exploded View... -
Page 40: Bom List
PANEL LM170E03-TLL3 LPL H40G 17N690 6B RATING LABEL H40G581H690 2A CARTON LABEL H41G780069099C SCREEN FLY (311618-007 H44G3793690 1C CARTON(374166-00C) H52G6025 16 27 INSULATE SHEET Q23G3178690 8A LOGO Q41G160069038C DOC-KIT L1740 NA Q41G7800690B36 RTF CARD Q45G 76 28 H PE BAG FOR MANUAL... - Page 41 17" LCD Color Monitor HP L1740 Q45G 88609 29 PE BAG(EPE) Q50G 505 19 BEND CN402 33G3802 7 6176 WAFER EH 7 CN401 33G3802 14 6176 14P/2.0MM CN302 33G801930F H6W34 FPC CONN .1.0MM 30P 40G 457624 1B CPU LABEL 40G 45762412B...
- Page 42 17" LCD Color Monitor HP L1740 R240 61G0603000 6857 RST CHIPR 0 OHM +-5% 1/ R302 61G0603000 6857 RST CHIPR 0 OHM +-5% 1/ R303 61G0603000 6857 RST CHIPR 0 OHM +-5% 1/ R402 61G0603000 6857 RST CHIPR 0 OHM +-5% 1/...
- Page 43 17" LCD Color Monitor HP L1740 R313 61G0603101 6857 RST CHIPR 100 OHM +-5% R318 61G0603101 6857 RST CHIPR 100 OHM +-5% R319 61G0603101 6857 RST CHIPR 100 OHM +-5% R323 61G0603101 6857 RST CHIPR 100 OHM +-5% R325 61G0603101...
- Page 44 17" LCD Color Monitor HP L1740 R422 61G0603182 6857 RST CHIPR 1.8KOHM +-5% R429 61G0603221 6857 RST CHIPR 220 OHM +-5% R431 61G0603221 6857 RST CHIPR 220 OHM +-5% R234 61G0603222 6857 RST CHIPR 2.2KOHM +-5% R243 61G0603222 6857 RST CHIPR 2.2KOHM +-5%...
- Page 45 17" LCD Color Monitor HP L1740 C303 65G0603104 326805 CHIP 0.1UF 50V X7R C304 65G0603104 326805 CHIP 0.1UF 50V X7R C306 65G0603104 326805 CHIP 0.1UF 50V X7R C307 65G0603104 326805 CHIP 0.1UF 50V X7R C309 65G0603104 326805 CHIP 0.1UF 50V X7R...
- Page 46 17" LCD Color Monitor HP L1740 C234 65G0603221 316857 CAP:CER 220PF 5% 50V SM C204 65G0603224 32 CHIP 0.22UF 50V X7R C233 65G0603224 32 CHIP 0.22UF 50V X7R C318 65G0603224 32 CHIP 0.22UF 50V X7R C523 65G0603224 32 CHIP 0.22UF 50V X7R...
- Page 47 17" LCD Color Monitor HP L1740 D501 93G 6432P LL4148 D201 93G 6433P BAV99 D212 93G 6433P BAV99 D213 93G 6433P BAV99 Y501 93G 22S 45 H CRYSTAL 24.00000MHZ/20P ZD201 93G 39P599 T MM3Z5V6B ZD202 93G 39P599 T MM3Z5V6B ZD203...
- Page 48 17" LCD Color Monitor HP L1740 C808 65G 3J5096ET 5PF 5% 3KV TDK C801 65G 6J1506ET 15PF 5% SL 6KV C806 65G 6J1506ET 15PF 5% SL 6KV C900 65G305M1022BP Y2 1000PF M 250VAC Y5P C901 65G305M1022BP Y2 1000PF M 250VAC Y5P...
- Page 49 17" LCD Color Monitor HP L1740 Q821 57G 763 14 AM9945N Q841 57G 763 14 AM9945N R829 61G0805000 6857 RST CHIPR 0 OHM +-5% 1/ R849 61G0805000 6857 RST CHIPR 0 OHM +-5% 1/ R926 61G0805000 6857 RST CHIPR 0 OHM +-5% 1/...
- Page 50 17" LCD Color Monitor HP L1740 R943 61G0805510 1F6857 RST CHIPR 5.1KOHM +-1% R812 61G0805624 6857 RST CHIPR 620KOHM +-5% R825 61G0805750 1F6857 RST CHIPR 7.5KOHM +-1% R837 61G0805750 1F6857 RST CHIPR 7.5KOHM +-1% R916 61G0805751 6857 RST CHIPR 750 OHM +-5%...
- Page 51 17" LCD Color Monitor HP L1740 C874 65G0805105 226826 CHIP 1UF 25V X7R 0805 C914 65G0805105 226826 CHIP 1UF 25V X7R 0805 C915 65G0805123 226029 CHIP 12nF 25V X7R 0805 C822 65G0805222 316805 0805 2200PF C823 65G0805222 316805 0805 2200PF...
- Page 52 17" LCD Color Monitor HP L1740 J817 95G 90 23 TINCOATEDCOPPER J818 95G 90 23 TINCOATEDCOPPER J820 95G 90 23 TINCOATEDCOPPER J821 95G 90 23 TINCOATEDCOPPER J822 95G 90 23 TINCOATEDCOPPER J823 95G 90 23 TINCOATEDCOPPER J824 95G 90 23...
- Page 53 17" LCD Color Monitor HP L1740 M1G1730 8128 CR3 SCREW D935 93G1506 2 FMW-2156 M1G1730 6128 CR3 SCREW M3x6 Q90G6322 1 HEAT SINK NR901 61G 5810T 6872 RST NTCR 8 OHM +-20% 4A 96G 29 10 H.S.TUBE C936 67G215H102 3N...
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Page 54: Different Parts List
17" LCD Color Monitor HP L1740 14. Different Parts List Diversity of T77CNNDKCKHFQE Compared with T77GNNDKCKHFQE Location Part No. Description CBPC6CNNHPQ2P MAIN BOARD PWPC742CH1P POWER BOARD 89G179J30H711 FFC CABLE 705GH734010 ASS'Y 750GLB70A7P11Z000H PANEL CLAA170EA07P 000 C204 65G0603224 226029 CHIP 0.22UF 25V X7R... - Page 55 17" LCD Color Monitor HP L1740 Q502 57G 7631PH FET POW SM SI5441DC(VIS R212 61G0603000 6865 RST CHIPR 0 OHM +-5% 1/ R233 61G0603000 6865 RST CHIPR 0 OHM +-5% 1/ R240 61G0603000 6865 RST CHIPR 0 OHM +-5% 1/...
- Page 56 17" LCD Color Monitor HP L1740 R323 61G0603101 6865 RST CHIPR 100 OHM +-5% R325 61G0603101 6865 RST CHIPR 100 OHM +-5% R326 61G0603101 6865 RST CHIPR 100 OHM +-5% R333 61G0603101 6865 RST CHIPR 100 OHM +-5% R205 61G0603103...
- Page 57 17" LCD Color Monitor HP L1740 R431 61G0603221 6865 RST CHIPR 220 OHM +-5% R234 61G0603222 6865 RST CHIPR 2.2KOHM +-5% R243 61G0603222 6865 RST CHIPR 2.2KOHM +-5% R306 61G0603391 6865 RST CHIPR 390 OHM +-5% R403 61G0603470 6865 RST CHIPR 47 OHM +-5% 1...
- Page 58 17" LCD Color Monitor HP L1740 Y301 93G 22S 51 12MHZ/20PF/AGX-49U/S SM 715G1864 2 6905 MAIN BOARD PCB C900 65G305M1022BP6W29 Y2 1000PF M 250VAC Y5P C901 65G305M1022BP6W29 Y2 1000PF M 250VAC Y5P C912 65G306M2222BP6W29 2200PF +-20% 400VAC C956 67G215S2213KV6366 ELCAP 220UF +-20% 16V 1...
- Page 59 17" LCD Color Monitor HP L1740 R823 61G1206100 6865 RST CHIPR 10 OHM +-5% 1 R842 61G1206100 6865 RST CHIPR 10 OHM +-5% 1 R843 61G1206100 6865 RST CHIPR 10 OHM +-5% 1 R931 61G1206229 6857 RST CHIPR 2.2 OHM +-5%...
- Page 60 17" LCD Color Monitor HP L1740 C204 65G0603224 226029 CHIP 0.22UF 25V X7R C233 65G0603224 226029 CHIP 0.22UF 25V X7R C318 65G0603224 226029 CHIP 0.22UF 25V X7R C523 65G0603224 226029 CHIP 0.22UF 25V X7R D901 93G 6026W52T FR107 ZD975 93G 39GA26 T ZENER DIODE RLZ5.1B SEM...