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

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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

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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

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Revision List
Revision Date Change Description

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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
p
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

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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

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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
15
610
11 15

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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

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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

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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