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17" LCD Color Monitor
HP L1740
Service Service Service
Horizontal Frequency 24- 83 kHz
TABLE OF CONTENTSDescription Page Description Page
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 Characteristics9 6. Block Diagram...................................10 6.1 Software Flow Chart...10 6.2.Electrical Block Diagram.........12
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 10 White-Balance, Luminance adjustment...33 11.Mechanical Instructions............35 12. Monitor Exploded View.............39 13. BOM List..40 14. Different Parts List....................................54
SAFETY NOTICE 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 1
17" LCD Color MonitorRevision ListVersion A00 Date Mar.-20-2007 Revision History Initial release
HP L1740
TPV Model Name T77GNNDKCKHFQE T77CNNDKCKHFQE T77ANNDKCKHFQE T76CNNDBCKHPQE T77CNNDBCKHFQE
A01
Apr.-06-2007
Add TPVDW Model in Item 14 1.Update Layout and BOM 2.Add TPVDW Model in Item 14
A02
May.-23-2007
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17" LCD Color Monitor 1. Monitor Specification
HP L1740
3
17" LCD Color Monitor 2. LCD Monitor Descriptioncontrol logic and DDC.
HP L1740
The LCD Monitor will contain main board, power board, a key board which house the flat panel control logic, brightness The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage.
Monitor Block Diagram
CCFT Drive.
Flat Panel and CCFL backlight
Power Board (Include adapter board)
Main Board
RS232 Connector For white balance adjustment in factory mode
Keyboard
AC-IN 110V-240V
Video signal, DDC HOST Computer
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17" LCD Color Monitor 3. Operation Instructions3.1 General Instructions
HP L1740
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. The power cord should be connected and insert to adaptor. 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.
3.2 Control Button
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17" LCD Color Monitor3.3 Adjust the Picture
HP L1740
1. If the monitor is not already on, press the Power switch to turn on the monitor. 2. Press the Menu button on the monitors front panel to launch the OSD Main Menu. 3. To navigate through the OSD Menu, press the + (Plus) buttonon the monitors front panel to scroll up, or the (Minus) button to scroll in reverse. 4. To select an item from the OSD Menu, use the + or buttons to scroll to and highlight your selection, then press the Menu button to select that function. 5. Adjust the item using the + or buttons on the front panel to adjust the scale. 6. After adjusting the function, select Save and Return, or Cancel if you dont want to save the setting, then select Exit from the Main Menu.
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17" LCD Color Monitor 4. Input/Output Specification4.1 Input Signal Connector 4.1.1 D-SUB connectorPin 1 2 3 4 5 6 7 8 Red Video Green Video Blue Video None Ground (DDC Return) Red GND Green GND Blue GND VGA connector layoutPIN 1 PIN 5
HP L1740
Signal
Pin 9 10 11 12 13 14 15
Signal 3.3/+5 V (from PC) Sync Ground None DDC Data Horizontal Sync Vertical Sync DDC Clock
PIN 11
4.1.2 DVI-D connectorPI N NO. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. DESCRIPTION TMDS data 2 TMDS data 2 TMDS data 2/4 Shield TMDS data 4 TMDS data 4 DDC Clock DDC Data Analog Vertical Sync TMDS data 1 TMDS data 1 TMDS data 1/3 Shield TMDS data 3 PI N NO. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. DESCRIPTION TMDS data 3 5V Power GND(return for +5v,hsync,vsync) Hot Plug Detect TMDS data 0 TMDS data 0 TMDS data 0/5 Shield TMDS data 5 TMDS data 5 TMDS Clock Shield TMDS Clock + TMDS Clock
24 - Pin Color Display Signal Cable
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17" LCD Color Monitor4.2 Factory Preset Display Modes
HP L1740
4.3 Power Supply RequirementsParameter AC Input Voltage AC Input Frequency Inrush Current Leakage Current Power Consumption Range 90 to 265V 45 to 63 Hz 50A MAX AT 220VAC and 30A AT 120VAC 5 mA MAX at 120VAC 37W
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17" LCD Color Monitor 5. Panel Specification5.1 General Feature
HP L1740
5.2 Optical Characteristics
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17" LCD Color Monitor 6. Block diagram6. 1 Software Flow Chart
HP L1740
1
2
Y N
3
4
5 Y 6
N
7 Y 9
N
8
10 Y N 12 Y 14
N
11
13 Y 15 Y 17
N
N
16
18
N
19 Y
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17" LCD Color MonitorREMARK:
HP L1740
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. 7) Are the AUTO and SELECT keys pressed? 8) Enter factory mode. 9) Save the power key status into EEprom. Turn on the LED and set it to green color. Scalar initialize. 10) In standby mode? 11) Update the lifetime of back light. 12) Check the analog port, are theyre any signals coming? 13) Does the scalar send out an interrupt request? 14) Wake up the scalar. 15) Are there any signals coming from analog port? 16) Display "No connection Check Signal Cable" message. And go into standby mode after the message disappear. 17) Program the scalar to be able to show the coming mode. 18) Process the OSD display. 19) Read the keyboard. Is the power key pressed?
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17" LCD Color Monitor6.2 Electrical Block Diagram6.2.1 Scalar Board
HP L1740
Crystal (12.000MHz) (Y301)
LCD interface (CN302)
EEPROM M24C16 (U302)
Scalar NT68663MEFG-128 (Include MCU, ADC, OSD) (U401) H sync V sync RGB D-Sub Connector (CN201) RGB DCLK+ DCLKDVID Connector (CN202)
EEPROM M24C02 (U403)
EEPROM M24C02 (U402)
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17" LCD Color Monitor6.2.2 Inverter / Power Board
HP L1740
AC input
EMI filter
Bridge Rectifier and Filter
Transformer
Rectifier diodes
Start Circuit 12V Feedback Circuit 5V
PWM Control IC G
Over Voltage Protect
ON/OFF LC Resonance Lamp Feedback Circuit Over Voltage PWM Control IC ON/OFF Control Transformer MOSFET
DIM
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17" LCD Color Monitor 7. Schematic7.1 Main BoardR202 DVI_5V R203 CN202 DVI-D-Female SHELL1 AR AG AB AHS AGND NC A VS TX2TX2+ TX2/4 Shld TX4TX4+ DDC CLK DDC DATA TX1TX1+ TX1/3 Shld TX3TX3+ +5V GND HP Detect TX0TX0+ TX0/5 Shld TX5TX5+ TXC Shld TXC+ TXCSHELL2 ZD202 MM3Z5V6B C202 0.1uF 50V DDC-DVI-SDA GND GND RX2RX2+ 3 3 R205 R206 C204 10K 1/10W 10K 1/10W 0.22uF R207 BAV70 U402 8 7 6 5 R213 NC VCC A0 WP A1 SCL A2 SDA VSS 1 2 3 4 10K 1/10W 3 1 GND D203 2 DVI_5V +5V ZD203 MM3Z5V6B 2 DDC-DVI-SCL 100 1/10W DVI-SDA 3 100 1/10W DVI-SCL 3
HP L1740
31
C1 C2 C3 C4 C5 C6 8 1 2 3 4 5 6 7 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
FB202 120 1
R208 NC
+3.3V
RX1RX1+
3 3 3 DDC_W_D DDC-DVI-SCL R209 DDC-DVI-SDA R210
GND
100 1/10W 100 1/10W C201 C205 33pF 33pF
R212 0 1/10W
R211 10K 1/10W
DVI_CABLE RX0RX0+
3 3 3
M24C02-WMN6TP GND
32 GND
RXC+ RXC-
3 3
GND
GND
GND
3
3
3
3
3
3
3
GND
DVI InputGND
C206 0.1uF 50V
D204 NC
D205 NC
D206 NC
D207 NC
D208 NC
D209 NC
D210 NC
3
D211 NC
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
C207 NC
C208 NC
C209 NC
C210 NC
C211 NC
C212 NC
C213 NC
C214 NC GND
+3.3V
C215 0.1uF 50V 2 1
C216 0.1uF 50V 2 1 2
C217 0.1uF 50V 1