Hyundai ImageQuest L50AF Manuale operativo
Multiscanning Color Monitor
TECHNICAL SERVICE MANUAL
L50A/L50AF
L50A 01.4.30 2:53 PM ˘`A
--1--
Safety Precaution
WARNING
Service should not be attempted by anyone unfamiliar with the necessary precautions on this monitor.
The followings are the necessary precautions to be observed before servicing.
1. When managing this monitor , cover with shield plate to avoid to scrach on LCD surface.
2. When replacing a chassis in the cabinet, always be certain that all the protective devices are
put back in place, such as nonmetallic control knobs, insulating covers, shields, isolation resistor
capacitor network etc.
3. Before returning the monitor to the customer, always perform an AC leakage current check
on the exposed metallic parts of the cabinet, such as signal connectors, terminals, screw heads,
metal overlays, control shafts etc, to be sure the monitor is safe to operate without danger of
electrical shock.
General Information
1. Description
This 15" LCD color display monitor is operated in R, G, B drive mode input.
2. Operating instructions
2-1. Front
Power Switch , Menu, Select, Down, Up, DPMS (Power) LED
2-2. Rear
Input connector (AC & Signal Cable)
2-3. OSD Controls
H/V Position, Clock (H-Size),Clock Phase, Brightness, Contrast, Recall,Color Control, Preset
mode, Language, OSD Adjust , Auto Adjust
3. Electrical Characteristic
3-1. Power Supply
AC/DC - Input Voltage : 90V~264V
Input Current : 1.5 A Max
Input Ferquency : 50 ~ 60Hz
- Output Voltage 12V/5V
Output Vurrent 2A/2A
3-2. Video Input Signal
Level : 0.7 Vp-p analog signal(at 75 ohm termination to ground)
Polarity : Positive
3-3. Horizontal Synchronization Signal
Level : TTL High : 2.4V min
Low : 0.4V max
Polarity : - or +
Frequency : 31kHz ~ 68.7kHz
*Framelock Mode : 31.0 kHz ~ 60.0kHz
3-4. Vertical Synchronization Signal
Level : TTL High : 2.4V min
Low : 0.4V max
Polarity : - or +
Frequency : 44Hz ~ 87Hz
*Framelock Mode : 44Hz ~ 75Hz
L50A 01.4.30 2:53 PM ˘`1
--2--
L50A/L50AF Technical Service Manual
Control Description
Front View
Support Modes
* : Framelock Mode Timing i : Interlace Mode Timing
LED Indicator Soft Power Switch
H Frequency
(kHz)
31.5
31.5
31.5
37.9
37.9
37.9
31.5
37.9
43.3
35.2
37.9
48.1
46.9
53.7
49.7
35.5
48.4
56.5
60.0
68.7
V Frequency
(Hz)
70.0
70.0
70.1
85.1
85.1
85.0
59.9
72.8
85.0
56.3
60.3
72.2
75.0
85.1
74.5
86.9
60.0
70.1
75.0
85.0
H
Polarity
1
0
0
1
0
0
0
0
0
1
1
1
1
1
0
1
0
0
1
1
V
Polarity
0
1
1
0
1
1
0
0
0
1
1
1
1
1
0
1
0
0
1
1
V
Polarity
25.175
25.420
28.322
31.500
31.500
35.500
25.175
31.500
36.000
36.000
40.000
50.000
49.500
56.250
57.283
44.900(i)
65.000
75.000
78.750
94.500
NO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Resolution
640 x350 *
640 x 400 *
720 x 400 *
640 x 350
640 x 400
720 x 400
640 x 480 *
640 x 480 *
640 x 480
800 x 600 *
800 x 600 *
800 x 600 *
800 x 600 *
800 x 600
832 x 624 *
1024 x 768
1024 x 768 *
1024 x 768 *
1024 x 768 *
1024 x 768
Preset Mode Timing
* Framelock Mode Timing
Horizontal Frequency
25.175
25.420
28.322
31.500
31.500
35.500
25.175
31.500
36.000
36.000
40.000
49.500
50.000
56.250
57.283
44.900
65.000
75.000
78.750
94.500
--3--
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Resolution
640 x350 *
640 x 400 *
720 x 400 *
640 x 350
640 x 400
720 x 400
640 x 480 *
640 x 480 *
640 x 480
800 x 600 *
800 x 600 *
800 x 600 *
800 x 600 *
800 x 600
832 x 624 *
1024 x 768
1024 x 768 *
1024 x 768 *
1024 x 768 *
1024 x 768
Refresh rate
70.086
69.911
70.087
85.080
85.080
85.039
59.940
72.809
85.008
56.250
60.317
75.000
72.188
85.061
74.550
86.900
60.004
70.069
75.029
84.997
L50A 01.4.30 2:54 PM ˘`3
Video Input Signal
Recommended signal are shown below
•Video Signal
Video level : 0 to 700mV
Polarity : positive
Video Input : RGB separated
Analog level
Sync input : H-Sync(TTL level)
V-Sync (TTL level)
•Waveform
Video input(R.G.B)
--4--
L50A/L50AF Technical Ser ice Manual
ACTIVE (4)
Front Porch
(T5) Period (T1)
Sync Width (T2)
Back Porch (T3)
ACTIVE (4)
Front Porch
(T5) Period (T1)
Sync Width (T2)
Back Porch (T3)
• H-Sync • V-Sync
0
1
2
3
4
251 252
253
254
255 700mV
0mV
• Signal: 256 level gray
scale
• Linear stepping:
(2.73mV ~ 256 Steps)
L50A 01.4.30 2:54 PM ˘`4
--5--
Video Input Terminal
A 15 Pin D-sub connector is used as the input signal connector
Pin and input signals are shown in the table below.
Pin Description
D-Sub miniature connector
SIGNAL
PIN NO.
3
2
1
5
4
6
7
8
9
10
11
12
13
14
SEPARATE SYNC/
DDC 1/2B
RED
GREEN
BLUE
GND
RETURN
RED GROUND
GREEN GROUND
BLUE GROUND
N.C
LOGIC GROUND
GROUND
SDA
H-SYNC(TTL)
V-SYNC(VCLK)
15 SCL
L50A 01.4.30 2:54 PM ˘`5
Connecting with External Equipment
Cautions
Be sure to turn off the power of your computer before connecting the monitor.
--6--
L50A/L50AF Technical Ser ice Manual
L50A 01.4.30 2:54 PM ˘`6
--7--
Theory of Operation
1. AC/DC Adapter
Input voltage : 90 ~ 264 Vac, 50/60 Hz
Input current : Max 1.5A (Vin : 90Vac , 50Hz)
Inrush current : 15A peak (At 115Vac Max . Load)
30A peak (At 230Vac Max. Load)
Output voltage : 18Vdc (At 115Vac / 230Vac Max , Load)
Output current : 2.5Adc (Max. Load)
Over Current Protection : 3.0 ~5.0Adc (At 115Vac / 230Vac)
2. DC/AC INVERTER
Input voltage : DC 12V
Input current : 2.0A(Max)
Output current : 15.0mA(Max) , 3.0mA(Min)
Frequency(switching) : 40KHz
Output power : 4.5W(Max)
On/off control voltage : 5.0V
3 . Video circuit
Input signals are amplified by a preamp TDA9206, then a gain of R.G.B Signal are changed by
controlling Color Temperature(OSD Adjust). Amplified video signals are input to the
ADC(Analog to Digital Converter) and converted to digital signals.
Again,digitized video signals are input to the MX88271(or MX88281:Video Processor), and
output to the LCD module as synchronized timing after it execute the function of Zooming,
Scaling, Frame Rate Conversion, Brightness, Contrast, Dithering, Gamma compensation etc...
4. Clock(H-size)
Clock generator, CXA3106A(PLL Chip), is controlled by MCU.
Pixel clock is changed according to each video mode.
5. DPMS MODE
Reference to DPMS files
Status
on Pulse Pulse Active
Blank
Blank
No
Pulse
No
Pulse
Pulse
No
Pulse
Suspend
off
Signal Power
Consumption
-
Within3
Sec
Within 3
Sec
Recovery
Time
Green/Orange(about 0.5 sec)
Orange
LED
Indicator
Green
40W
Less Than 10W
Less Than 5W
H-Sync V-Sync Video
L50A 01.4.30 2:54 PM ˘`7
--8--
L50A/L50AF Technical Service Manual
On Screen Controls & LED Indicator
The menu for screen setting adjustment is located in the OSD and can be viewed in one of five
languages
OSD feature andmain funcrions are as follows:
BRIGHTNESS
Adjust the brightness of the screen.
CONTRAST
Adjust the contrast of the screen.
H-POSITION
Adjust the horizontal position of the entire screen image.
V-POSITION
Adjust the vertical position of the entire screen image.
CLOCK (WIDTH)
Adjust the horizontal size of the entire screen image.
CLOCK-PHASE
Adjust the noise of the screen image.
AUTO ADJUST
Adjust the shape of screen atomatically.
COLOR CONTROL
Color temperature affects the tint of the image. With lower color
temperatures the image turns reddish and with higher temperatures
bluish.
--9--
There are three color settings available: Mode 1(a cool white), Mode 2(a warm white) or
USER. With the USER setting you can set individual values for red, green and blue.
INFORMATION
Information shows the horizontal and vertical frequency of your
display unit. The Information menu lists modes which are preset at the
factory and modes which have been defined by user. It also shows
you the mode your display unit is currently operating in. you can set
the display mode (frequency and refresh rate) in Windows.
LANGUAGE
You can select the language in which adjustment menus are displayed.
The following languages are available: English, French, German,
Italian, Spanish, Swedish, Finnish, Danish, Portuguese and Japanese
or Korean.
OSD ADJUST
You can adjusts the OSD menu's horizontal or vertical position on the
screen. You can also adjust display time of the OSD menu from 5 to
50 seconds.
TEST PATTERN
Displays internal test pattern.
The Clock Phase may not be optimized when the input timing is not comply with VESA
standard timing. In order to get the optimized result of Auto Adjust Function, it is
recommended to display bright color image on the entire screen before proceeding Auto
Adjust Function.
!
L50A 01.4.30 2:54 PM ˘`9
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