akira LCT-17HT User manual

LCD Monitor
Service Manual

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Model No.: LCT-17HT
Version: 1.0
MODEL:
LCT-17HT

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Model No.: LCT-17HT
Version: 1.0
CONTENTS
SPECIFICATION ..................................................................................................................................... 4
PANEL: HT17E12-200 ............................................................................................................................ 5
8 BIT MTP MICROCONTROLLER ..................................................................................................... 27
T0947 SCALER IC FPR XGA/SXGA LCD MONITORS .................................................................... 63
BLOCK DIAGRAM ............................................................................................................................ 184
TV TUNER .......................................................................................................................................... 185
EXPLODED VIEW & PART LIST...................................................................................................... 186

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Model No.: LCT-17HT
Version: 1.0
SPECIFICATION
 Resolution: 17.0 inch SXGA (1280 x 1024 @75Hz)
 Color display: 16,777,216 colors
 DPMS (Display Power Management Signaling)
 OSD (On Screen Display)
 Auto Configuration: Hot Key
 Speaker [L + R: 3W + 3W = 6W (max)]
 DDC 1/2 B: Plug & Play

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Model No.: LCT-17HT
Version: 1.0
PANEL: HT17E12-200
1. GENERAL DESCRIPTION
1.1 Introduction
HT17E12-200 is a color active matrix TFT LCD module using amorphous silicon TFT's (Thin Film
Transistors) as an active switching devices. This module has a 17.0 inch diagonally measured active area
with SXGA resolutions (1280 horizontal by 1024 vertical pixel array). Each pixel is divided into RED,
GREEN, BLUE dots which are arranged in vertical stripe and this module can display 16,194,227 colors.
The TFT-LCD panel used for this module is adapted for a low reflection and higher color type.
1.2 Features
 LVDS Interface with 2 pixel / clock
 High-speed response
 Low power consumption
 6-bit (FRC) color depth, display 16,194,227 colors
 Incorporated edge type back-light (Four lamps)
 High luminance and contrast ratio, low reflection and wide viewing angle
 DE (Data Enable) mode

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Model No.: LCT-17HT
Version: 1.0
1.3 Applications
 Desktop Type of PC & Workstation Use
 Slim-Size Display for Stand-alone Monitor
 Display Terminals for Control System
 Monitors for Process Controller
1.4 General Specifications
The followings are general specifications at the model HT17E12-200
<Table 1. General Specifications>
Parameter Specification Unit
Active area 337.92 (H) ×270.336(V) Mm
Number of pixels 1280(H) ×1024(V) pixels
Pixel pitch 0.264(H) ×0.264(V) Mm
Pixel arrangement RGB Vertical stripe
Display colors 16,194,227 colors
Display mode Normally White
Dimensional outline 358.5(H) ×296.5(V) ×17.0(D) type Mm
Weight 1900 max. gram
Back-light Top/Bottom edge side 4-CCFL type
Note: 1. CCFL (Cold Cathode Fluorescent Lamp)

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Model No.: LCT-17HT
Version: 1.0
2.0 ABSOLUTE MAXIMUM RATINGS
The followings are maximum values which, if exceed, may cause faulty operation or damage to the unit.
The operational and non-operational maximum voltage and current values are listed in Table 2.
<Table 2. Absolute Maximum Ratings> [VSS = GND =0V]
Parameter Symbol Min Max Unit Remarks
Power Input Voltage VDD VSS-0.5 6.5 V
Logic Input Voltage VIN VSS-0.3 VDD+0.3 V Ta=25oC
Back-light Lamp Current IBL 3 7 mA
Back-light lamp
Frequency
FL30 (80) KHz
Operating Temperature TOP 0 +50 oC 1)
Storage Temperature TST -20 +60 oC 1)
Notes:
1. Temperature and relative humidity range are shown in the figure below.
2. Wet bulb temperature should be 39oC max and no condensation of water.

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Model No.: LCT-17HT
Version: 1.0
3.0 ELECTRICAL SPECIFICATIONS
< Table 3. Electrical specifications > [Ta = 25±2oC]
Parameter Min Typ Max Unit Remarks
Power Supply Voltage VDD 4.5 5.0 5.5 V
Power Supply Current IDD - 580 700 mA Note1
Permissible Input Ripple
Voltage
VRF 100 mV VDD = 5.0V
High Level Differential Input
Threshold Voltage
VIH - +100 mV
Low Level Differential Input
Threshold Voltage
VIL -100 - mV
Vcm
= 1.2V typ
Back-light Lamp Voltage VBL 690 700 840 Vrms
Back-light Lamp Current IBL 3.0 6.5 7.0 mArms
Back-light Lamp operating
Frequency
FL30 - 70 KHz Note 2
940 1170 Vrms 25oC, Note 3
Lamp Start Voltage 1340 1570 Vrms 0
oC, Note 3
Lamp Life 40000 50000 hrs IBL = 6.5mA
PD2.9 W
PBL 18.2 W
Power Consumption
Ptotal 21.1 W
IBL= 6.5mA,
Note 4
Notes:
1. The supply voltage is measured and specified at the interface connector of LCM. The current draw
and power consumption specified is for VDD = 5.0V, Frame rate= 75Hz and Clock frequency =
67.5MHz. Test Pattern of power supply current
a. Typ: Black pattern
b. Max: Dot pattern
2. The lamp frequency should be selected as different as possible from the horizontal synchronous
frequency and its harmonics to avoid interference, which may cause line flow on the display
3. The voltage above this value should be applied to the lamps for more than 1 second to start-up.
Otherwise the lamps may not be turned on.
4. Calculated value for reference (VBL ×I
BL) ×4 excluding inverter loss.

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Model No.: LCT-17HT
Version: 1.0
4.0 OPTICAL SPECIFICATIONS
4.1 Overview
The test of Optical specifications shall be measured in a dark room (ambient luminance ≤1 lux and
temperature = 25±2°C) with the equipment of Luminance meter system (Goniometer system and
TOPCON BM-5) and test unit shall be located at an approximate distance 50cm from the LCD surface at
a viewing angle of θand φequal to 0°. We refer to θφ=0 (=θ3) as the 3 o’clock direction (the “right”),
θφ=90 (=θ12) as the 12 o’clock direction (“upward”), θφ=180 (=θ9) as the 9 o’clock direction (“left”)
and θφ=270 (=θ6) as the 6 o’clock direction (“bottom”). While scanning θand/or φ, the center of the
measuring spot on the display surface shall stay fixed. The measurement shall be executed after 30
minutes warm-up period. VDD shall be 5.0V +/- 10% at 25°C. Optimum viewing angle direction is 6
o’clock.
4.2 Optical Specifications
[VDD=5.0V, Frame rate=60Hz, Clock=54MHz, IBL = 6.5mA, Ta = 25±2℃]
Parameter Symbol Condition Min Typ Max Unit Remark
3 75 80 - Deg
Horizontal
9 75 80 - Deg
12 60 65 - Deg
Vertical
6
CR>10
60 65 - Deg
3 80 85 - Deg
Horizontal
9 80 85 - Deg
12 70 75 - Deg
Viewing
Angle
Vertical
6
CR>5
70 75 - Deg
Note 1
Luminance contrast ratio CR 350 430 - Note 2
Luminance of white YW200 250 - cd/m2Note 3
White luminance
uniformity Y
- - 1.2 Note 4
Wx 0.270 0.300 0.330
White Wy 0.305 0.335 0.365
Rx 0.599 0.629 0.659
Red Ry 0.324 0.354 0.384
Gx 0.257 0.287 0.317
Green Gy 0.568 0.598 0.628
Bx 0.115 0.145 0.175
Reproduction
of color
Blue By 0.073 0.103 0.133
Note 5
Tr - 5
Response time Td - 15 30 msec Note 6
Cross talk CT
=0o
(Center)
Normal
Viewing
Angle
- - 2.0 % Note 7

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Model No.: LCT-17HT
Version: 1.0
Note:
1. Viewing angle is the angle at which the contrast ratio is greater than 10. The viewing are determined
for the horizontal or 3, 9 o’clock direction and the vertical or 6, 12 o’clock direction with respect to
the optical axis which is normal to the LCD surface.
2. Contrast measurements shall be made at viewing angle of θ= 0° and at the center of the LCD surface.
Luminance shall be measured with all pixels in the view field set first to white, then to the dark
(black) state. (See FIGURE 1 shown in Appendix) Luminance Contrast Ratio (CR) is defined
mathematically.
CR = Luminance when displaying a white raster
Luminance when displaying a black raster
3. Center Luminance of white is defined as the LCD surface. Luminance shall be measured with all
pixels in the view field set first to white. This measurement shall be taken at the locations shown in
FIGURE 2 for a total of the measurements per display.
4. The White luminance uniformity on LCD surface is then expressed as : Y = Maximum
Luminance of five points / Minimum Luminance of five points (See FIGURE 2 shown in appendix).
5. The color chromaticity coordinates specified in Table 4. shall be calculated from the spectral data
measured with all pixels first in red, green, blue and white. Measurements shall be made at the center
of the panel.
6. The electro-optical response time measurements shall be made as FIGURE 3 shown in Appendix by
switching the “data” input signal ON and OFF. The times needed for the luminance to change from
10% to 90% is Td, and 90% to 10% is Tr.
7. Cross-Talk of one area of the LCD surface by another shall be measured by comparing the
luminance (YA) of a 25mm diameter area, with all display pixels set to a gray level, to the luminance
(YB) of that same area when any adjacent area is driven dark. (See FIGURE 4 shown in Appendix).