36702320 Aoc Service Manual Hp l1740 Nt68663mefg Tpv Power a02 1947

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

2

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

4

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

5

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.

6

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

7

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

8

17" LCD Color Monitor 5. Panel Specification5.1 General Feature

HP L1740

5.2 Optical Characteristics

9

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

10

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?

11

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)

12

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

13

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