Toshiba LCD-AD174TW User manual

AD174TW TOSHIBA

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SERVICE MANUAL

TOSHIBA

LCD-AD174TW

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.

MANUFACTURE DATA ：Jul-25-2006

AD174TW TOSHIBA

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Table of Contents

Table of Contents ----------------------------------------------------------------------------- 02

Revision List ------------------------------------------------------------------------------------04

1. Product Feature ----------------------------------------------------------------------------05

2. LCD Monitor Description -----------------------------------------------------------------05

3. Operation Instructions --------------------------------------------------------------------06

3.1 General Instructions ------------------------------------------------------------------06

3.2 Control Buttons ------------------------------------------------------------------------06

3.3 Adjusting The Picture ----------------------------------------------------------------06

4. Electrical Performance Parameter ------------------------------------------------- 07

4.1 Input Signal Connector --------------------------------------------------------------07

4.2 Factory Preset Display Modes -----------------------------------------------------08

4.3 Power Supply --------------------------------------------------------------------------09

4.3.1 Input/Output Requirements ---------------------------------------------------09

4.3.2 Inverter Max Brightness ------------------------------------------------------- 09

4.3.3 Inverter Min Brightness --------------------------------------------------------10

4.4 Panel Specification ----------------------------------------------------------------10

4.4.1 General Feature (BOE HT170E13-101) ----------------------------------10

4.4.2 Optical Characteristics -------------------------------------------------------11

4.4.3 Parameter guide line for CCFL Inverter -----------------------------------12

5. Block Diagram ------------------------------------------------------------------------------13

5.1 Monitor Exploded View -------------------------------------------------------------13

5.2. Disassemble Process --------------------------------------------------------------15

5.3 Software Flow Chart ------------------------------------------------------------------19

5.4. Block Diagram ---------------------------------------------------------------------------21

AD174TW TOSHIBA

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5.4.1 Electrical Block Diagram ------------------------------------------------------21

5.4.2 Inverter/Power Board Block Diagram --------------------------------------22

6. Schematic -----------------------------------------------------------------------------------24

6.1 TOP ------------------------------------------------------------------------------------24

6.2 Main Board ---------------------------------------------------------------------------25

6.3 PWPC Board -----------------------------------------------------------------------29

6.3 KeyPad Board -----------------------------------------------------------------------31

6.4 Audio Board ------------------------------------------------------------------------32

7. PCB Layout ---------------------------------------------------------------------------------33

7.1 Main Board ----------------------------------------------------------------------------33

7.2 Inverter/Power Board ---------------------------------------------------------------35

7.3 Keypad Board -------------------------------------------------------------------------36

7.4 Audio Board ------------------------------------------------------------------------36

8. Maintainability ------------------------------------------------------------------------------36

8.1 Equipments and Tools Requirements -------------------------------------------36

8.2 Trouble Shooting ---------------------------------------------------------------------37

8.2.1 Main Board ---------------------------------------------------------------------37

8.2.2 Key Pad Board ------------------------------------------------------------------39

8.2.3 Power/Inverter Board ------------------------------------------------------40

9. White-Balance, Luminance Adjustment ---------------------------------------------42

10. EDID Content -----------------------------------------------------------------------------44

11. BOM List -----------------------------------------------------------------------------------45

11.1 AD174T——T781KK6NJ4D4ABP ------------------------------------------45~62

AD174TW TOSHIBA

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Revision List

Revision Date Change Description

AD174TW TOSHIBA

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1. PRODUCT FEATURE

43.2 cm (17”) a-si TFT Active matrix LCD panel, 0.264mm dot pitch.

Microprocessor controlled scan technology

20 factory presets,

Vertical refresh rate 55Hz to 75 Hz

Horizontal frequency 24kHz to 80kHz

Resolutions: 640 x 350 up to 1280 x 1024

Universal power supply designed for worldwide application

VESA DPMS compliant

VESA DDC2B compliant

ROHS compliant

2. LCD MONITOR DESCRIPTION

The LCD Monitor will contain a main board, an inverter/power board, keypad 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.

Power board

(

Include: ada

ter

inverter

)

Flat Panel and

CCFL backlight

Main Board

Keyboard

RS232 Connector

For white balance

adjustment in factory

mode

HOST Computer

CCFL Drive.

Video signal, DDC

Monitor Block Diagram

AD174TW TOSHIBA

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3. OPERATING INSTRUCTIONS

3.1 GENERAL INSTRUCTIONS

Press the power button to turn the monitor on or off. The other control buttons are located

at front panel of the monitor. By changing these settings, the picture can be adjusted to

your personal preferences.

-The power cord should be connected.

-Connect the video cable from the monitor to the video card.

-Press the power button to turn on the monitor, the power indicator will light up.

3.2 CONTROL BUTTONS

3.2.1 KEY CONTROL

3.3 ADJUSTING THE PICTURE

Power On/Off

Input signal

select / Auto

Adjustment

Volume +, - &

Menu Select

OSD Menu

AD174TW TOSHIBA

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CONTROL FUNCTION

Display Mode Normal, Text, Cinema, Photo, TV

ECO Mode

Brightness

Contrast

Color temperature sRGB, 6500K, 7200K, 9300K, User

LCD Adjustment

Clock

Phase

H. Position

V. Position

Other Setup

Smooth

OSD H. Position

OSD V. Position

OSD Timeout

OSDTransparency On Off

Mode message On Off

Language Japanese English

Reset

Exit

4. ELECTRICAL PERFORMANCE PARAMETER

4.1 INPUT SIGNAL CONNECTOR

PIN NO. DESCRIPTION PI N NO. DESCRIPTION

1. Red Video 9. +5V

2. Green Video 10. Detect Cable

3. Blue Video 11. RS232

4. RS232 12. DDC-Serial Data

5. DDC-Rturn 13. H-Sync

6. R-Ground 14. V-Sync

7. G-Ground 15. DDC-Serial Clock

8. B-Ground

VGA Connector layout

610

11 15

AD174TW TOSHIBA

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PIN NO. DESCRIPTION PI N NO. DESCRIPTION

1. TMDS data 2 - 13. TMDS data 3 + (NC)

2. TMDS data 2 + 14. + 5V Power

3. TMDS data 2/4 Shield 15. GND(return for +5v,hsync,vsync)

4. TMDS data 4 – (NC) 16. Hot Plug Detect

5. TMDS data 4 + (NC) 17. TMDS data 0 -

6. DDC Clock 18. TMDS data 0 +

7. DDC Data 19. TMDS data 0/5 Shield

8. Analog Vertical Sync 20. TMDS data 5 –(NC)

9. TMDS data 1 - 21. TMDS data 5 +(NC)

10. TMDS data 1 + 22. TMDS Clock Shield

11. TMDS data 1/3 Shield 23. TMDS Clock +

12. TMDS data3 – (NC) 24. TMDS Clock -

DVI-D 24 PIN CONNECTOR

4.2 FACTORY PRESET DISPLAY MODES：

VESA MODES

Horizontal Vertical

Mode Resolution Total

Nominal

Frequency

+/- 0.5kHz

Sync

Polarity

Nominal

Freq.

+/- 1 Hz

Sync

Polarity

Nominal

Pixel

Clock

(MHz)

640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175

640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500

VGA

640x480@75Hz 840 x 500 37.500 N 75.00 N 31.500

800x600@56Hz 1024 x 625 35.156 N/P 56.250 N/P 36.000

800x600@60Hz 1056 x 628 37.879 P 60.317 P 40.000

800x600@72Hz 1040 x 666 48.077 P 72.188 P 50.000

SVGA

800x600@75Hz 1056 x 625 46.875 P 75.000 P 49.500

1024x768@60Hz 1344x806 48.363 N 60.004 N 65.000

1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000

XGA

1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750

1280x1024@60Hz 1688x1066 63.981 P 60.020 P 108.000

SXGA 1280x1024@75Hz 1688x1066 79.976 P 75.025 P 135.000

1152x864@75HZ 1600x900 67.500 P 75.000 P 108.00

*** 1280x960@60HZ 1800x1000 60.000 P 60.000 P 108.00

AD174TW TOSHIBA

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NEC MODE

VGA 640x400@56Hz 848 x 440 24.827 N 56.424 N 21.052

IBM MODES

Horizontal Vertical

Mode Resolution Total

Nominal

Frequency

+/- 0.5kHz

Sync

Polarity

Nominal

Freq.

+/- 1 Hz

Sync

Polarity

Nominal

Pixel

Clock

(MHz)

DOS 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322

DOS 640x350@70Hz 800 x 449 31.469 P 70.087 N 25.175

MAC MODES

VGA 640x480@67Hz 864 x 525 35.000 N 66.667 N 30.240

SVGA 832x624@75Hz 1152 x 667 49.725 N 74.551 N 57.2832

XGA 1024x768@75Hz 1328 x 804 60.241 N 74.927 N 80.000

All modes will automatically optimize the screen size "AUTO-config" "function", except certain screen

pattern, such as only some characters display on black background.

4.3 POWER SUPPLY

4.3.1 INPUT/OUTPUT REQUIREMENTS

PARAMETER RANGE

AC Input Voltage 100 to 240V

AC Input Frequency 50 ±3Hz, 60 ±3Hz

AC Input Current 1.5A max at 100V ; 0.8A max at 240 V

Inrush Current < 55A peak at 240 VAC and cold starting

Leakage Current <3.5 mA MAX

Power line surge No advance effects (no loss of information or defect)

with a maximum of 1 half-wave missing per second

AD174TW TOSHIBA

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4.3.2 INVERTER MAX BRIGHTNESS (Vadj:5.0v), LOAD=100KΩX4

(ROOM TEMPERATURE 25 ±4 )℃℃

ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK

Input voltage Vin 10.8 12 13.2 V

Input current Iin 1700 1900 2100 mA FOR 4 LOAD

Output Current Iout 6.5 6.5 7.0 mA FOR 1 LOAD

Frequency F 30 --- 70 KHZ FOR 1 LOAD

H.V Load Vload 560 700 840 Vrms RL=100KΩ

Start voltage Vst 1600 --- --- Vrms RL=100KΩ

Protect delay time PDT 0.1 1 Sec

4.3.3 INVERTER MIN BRIGHTNESS (Vadj:0.0v), LOAD=100KΩX4

(ROOM TEMPERATURE 25℃±4℃)

ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK

Input voltage Vin 10.8 12 13.2 V

Input current Iin 400 450 500 mA FOR 4 LOAD

Output Current Iout 3.0 3.5 4.0 mA FOR 1 LOAD

Frequency F 30 --- 70 KHZ FOR 1 LOAD

Start voltage Vst 1600 --- --- Vrms RL=100KΩ

H.V Load Vload 560 700 840 Vrms RL=100KΩ

4.4 PANEL SPECIFICATION

4.4.1 General Feature ( BOE HT170E13-101 )

Parameter Specification Unit

Active area 337.92（H）x 270.336（V）mm

Number of pixels 1280（H）x 1024（V）pixels

Pixel Pitch 0.264（H）x0.264（V）mm

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