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

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

70.1

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

Polarity

25.175

25.420

28.322

31.500

35.500

25.175

31.500

36.000

40.000

50.000

49.500

56.250

57.283

44.900(i)

65.000

75.000

78.750

94.500

Resolution

640 x350 *

640 x 400 *

720 x 400 *

640 x 350

640 x 400

720 x 400

640 x 480 *

640 x 480

800 x 600 *

800 x 600

832 x 624 *

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

35.500

25.175

31.500

36.000

40.000

49.500

50.000

56.250

57.283

44.900

65.000

75.000

78.750

94.500

--3--

NO.

Resolution

640 x350 *

640 x 400 *

720 x 400 *

640 x 350

640 x 400

720 x 400

640 x 480 *

640 x 480

800 x 600 *

800 x 600

832 x 624 *

1024 x 768

1024 x 768 *

1024 x 768

Refresh rate

70.086

69.911

70.087

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

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.

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

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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