Daewoo HL720S User manual

LCD MONITOR
OCT. 2006
HL720S / HL720D
OSHL720001

HL720S/D Service Manual
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Contents
HL720S/D ......................................................................................................................................4
PRECAUTIONS .....................................................................................................................4
ITEMS ....................................................................................................................................6
HOW TO CONNECT THE SEVERAL CABLES TO THE LCD MONITOR ............................7
▶HL720S/D Cable Connections ..................................................................................7
ADJUSTING THE MONITOR.................................................................................................8
▶HL720S/D The Function Control Buttons ..................................................................8
▶How to use the function Key......................................................................................8
HL720S/D SPECIRICATIONS ...............................................................................................9
▶HL720S Specirications ..............................................................................................9
DISPLAY MODES ................................................................................................................10
PowerSaver..........................................................................................................................10
OSD MENU..........................................................................................................................11
▶Menu Tree ...............................................................................................................11
FACTORY SET ....................................................................................................................12
BURN-IN MODE ..................................................................................................................12
TROUBLESHOOTING .........................................................................................................13
▶No operating at all ...................................................................................................13
▶Doesn’t display on LCD ...........................................................................................14
EXPLODE VIEW ..................................................................................................................16
▶HL720S/D ................................................................................................................16
PART LIST............................................................................................................................17
▶HL720S/D Mechanical Part List ..............................................................................17
▶HL720S/D AD B/D Part List.....................................................................................18
▶HL720S FUNCTION B/D Part List...........................................................................21
▶Inverter & POWER BD Part List(FLF1742-20A) .....................................................22
▶Inverter & POWER BD Part List(FLF1742-20A) .....................................................23
BLOCK DIAGRAM.............................................................................................................24
HL720S/D Schematic...........................................................................................................25
▶AD B/D(HL720S/D)..................................................................................................25
▶Inverter & POWER B/D(FLF1742-20A)...................................................................30
PCB Layout ..........................................................................................................................32
▶AD B/D TOP SILK (HL720S/D) ...............................................................................32
▶AD B/D TOP PATTERN (HL720S/D).......................................................................33
▶AD B/D BOTTOM SILK (HL720S/D) .......................................................................34
▶AD B/D MASK TOP (HL720S/D) .............................................................................35

HL720S/D Service Manual
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▶AD B/D MASK BOTTOM (HL720S/D).....................................................................36
▶FUNC B/D TOP SILK (HL720S/D) ..........................................................................37
▶FUNC B/D TOP PATTERN (HL720S/D)..................................................................37

HL720S/D Service Manual
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HL720S/D
PRECAUTIONS
 Plug the power cord into a properly grounded outlet.
There is the risk of electric shock.
 If you hear a noise or smell smoke from the computer or adaptor, unplug the power
cord immediately, and call the service center.
There is the risk of electric shock or fire.
 Do not overload an electrical outlet with too many devices.
There is the risk of fire.
 Do not unplug from the outlet by pulling the power cord or when your hands are wet.
There is the risk of electric shock or fire.
 Do not bend the power cord excessively or place heavy objects on it. Keep children
and pets away from the power cord as they may damage the power cord. There is the
risk of electric shock or fire.
 Do not use a damaged power cord or plug. Make sure the plug fits snugly into the
outlet.
There is the risk of electric shock or fire.
 Do not expose the monitor to the direct sun light.
 Do not block the fan louvers.
There is the risk of fire or damage to the monitor.
 Do not attempt to disassemble, fix, or modify the monitor.
There is the risk of electric shock or fire.
 Keep the monitor away from high temperature, humidity, and dust.
Operating environment = 0 ~ 40 Degrees Celsius
Operating environment = 30 ~ 80 Relative Humidity
 Do not allow any object or liquid to enter inside the monitor.
There is the risk of electric shock, fire, or damage to the monitor.

HL720S/D Service Manual
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 Use a proper voltage/current level indicated.
 Do not clean the LCD with abrasive chemicals.
There is the risk of damage to the LCD.
 Do not scratch and damage the LCD with sharp objects.
 Keep the monitor away from objects and electrical appliances that may generate
electromagnetic fields.
 Place the monitor on a flat, stable surface.
The monitor may fall and there is the risk of damage or injury.
 Unplug the power cord when the monitor is not in use for a prolonged period of time.
 Make sure the power cord is unplugged.
 Do not spill or pour liquid on the monitor.
 Cleaning the LCD panel
1. Use a clean, soft cloth to wipe off dust from the LCD.
2. If still not clean, wipe the LCD with a clean soft cloth with a small amount of glass
cleaner without alcohol or ammonia.
 Caution
Do not use alcohol or ammonia based cleaning products. Abrasive chemicals, such as
alcohol or ammonia, may damage the monitor. The company is not responsible for the
damages to the monitor caused by the use of alcohol or ammonia based cleaning products.

HL720S/D Service Manual
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ITEMS
24-pin DVI Cable : *1
*1 : Only DVI Model

HL720S/D Service Manual
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HOW TO CONNECT THE SEVERAL CABLES TO THE LCD
MONITOR
▶HL720S/D Cable Connections
POWER ANALOG DVI-D
Name Cable connections
1 POWERCORD
2 15-PIN D-SUB SIGNAL CABLE
3 24-PIN DVI-D SIGNAL CABLE *1
*1 : Only DVI Model

HL720S/D Service Manual
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ADJUSTING THE MONITOR
▶HL720S/D The Function Control Buttons
▶How to use the function Key.
Button Function
MEMU 1. First click : The OSD main menu appears.
2. Second click : The OSD main menu disappears.
SELECT 1. Select a command function.
DOWN Down : 1. Move the on-screen highlighted command item to the next
one.
2. Decrease the current value.
UP/AUTO UP : 1. When you push Auto button,this will optimize quality automati-
cally.
2.Move the on-screen highlighted command item to the Previous
one.
3.Increase the current option value.
MWE Media Window Enhancement

HL720S/D Service Manual
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HL720S/D SPECIRICATIONS
▶HL720S Specirications
Panel Specification
Panel Type HT170EX1-101 or other
Panel Dimension 354.9 (H) x 290.3 (V) x 13.0(D) mm typ.
Screen diagonal 17.0 inches [337.92 (H) x 270.336 (V)mm
Pixel pitch 0.264mm x 0.264mm
Pixel format 1280(horizontal) x 1024 (Vertical) Pixels
RGB stripe arrangement
Color depth 8bit (16,777,216 colors)
Right 75(Typ.)
H
Left 75(Typ.)
Up 75(Typ.)
Viewing angle (Deg)
V
Down 60(Typ.)
Response Time 8 ms
Contrast ratio 700 : 1(typ.)
Average brightness 300 cd/m2(typ.)
Cross talk Horizontal: 2.0%(Max.), Vertical:2.0%(Max.)
Vertical Sync (Frame
rate)
60Hz(typ.), 75Hz(Max)
Horizontal Sync 31.5 ~ 80KHz
Dclk 54MHz(Typ.),68MHz(Max.)
Electrical Interface LVDS
Monitor’s specification
Resolution Recommend: 1280x1024@60Hz
Max. : 1280x1024@75Hz
Frequency Horizontal: 31.5 ~ 80 KHz
Vertical : 56 ~ 75 Hz
Sync. Signal TTL, P. or N.
OSD Control Power,Menu,Select,Down,Up/Auto,MWE

HL720S/D Service Manual
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DISPLAY MODES
※The optimal resolution is 1024Ⅹ768@60㎐(HL510S)
※The optimal resolution is 1280 1024Ⅹ@60㎐(HL720S)
PowerSaver