Sharp LLT1510A Schematic

SERVICE MANUAL
LCD COLOR MONITOR
MODEL LL-T1510A
CONTENTS
NOTES TO SERVICE PERSONNEL...................................................................................1
COUTIONS IN SERVICING.................................................................................................1
CHAPTER 1. OUTLINE OF THE PRODUCT, NOMENCLATURE AND FUNCTION..............4
CHAPTER 2. REPLACING LAMPS.........................................................................................7
CHAPTER 3. CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS..................9
CHAPTER 4. TROUBLESHOOTING.....................................................................................15
CHAPTER 6. WAVE FORM...................................................................................................19
CHAPTER 7. BLOCK DIAGRAM/UNIT TERMINALS............................................................22
CHAPTER 8. CIRCUIT DIAGRAM.........................................................................................24
CHAPTER 9. PARTS LAYOUT..............................................................................................36
Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.
This document has been published to be used
SHARP CORPORATION
for after sales service only. The contents are subject to change without notice.
Notes to service personnel
·Pictorials
·
This service manual and the product use a variety of pictorials in order to assure the safety of repair operations and of t he product repaired.
· If those pictorials are ignored in repairing, the following troubles might occur:
· Understand the meaning of those pictorials and read this manual carefully before trying to repair the product.
DANGER: WARNING: CAUTION:
Failure to follow the instructions in the message may cause a serious accident or death. Failure to follow the instructions in the message may cause a serious accident or death. Failure to follow the instructions in the message may cause personal injury or damage to the asset.
·Meaning of symbols ·Pictorial example
symbols mean the necessity of using caution.
symbols mean actions which are prohibited.
symbols mean actions to be required.
Cautions in servicing
Locations which require a special caution carry safety instructions using labels and stamps on the cabinet, chassis and components. When servicing, observe the instructions on such labels and stamps.
Electrical shock Hot surface
Don’t touch Remove power plug
Electrical shock and burn
1. Prior to servicing, make sure to remove the power supply plug.
Electrical shock
2. Some parts inside the unit have a high voltage. Use caution to avoid an electri cal shock accident when servicing an energized unit.
Use specified parts
3. The component parts of this unit have safety characteristics such as flame resistance and dielectric strength.
· Use replacement parts which have the same characteristics as those of the components parts used for this unit.
· In particular, component parts marked with ! in t he circuit drawing parts list are important for maintaining the safety of the
product. Make sure to use specified replacement parts.
Reinstall component parts in their original locations and return wires which have been rerouted for servicing purposes to their original positions.
4. Some component parts use insulating materials such as tubes or tape for safety purposes, or are mounted, a bi t floated, on the printed wiring board.
· When rerouting inside wiring or clamping the wires, use caution not to bring the wires too close to heating or high-voltage parts.
· Make sure to return inside wiring to their original locations.
Check for safety after servicing.
5. After finishing servicing, check whether the screws, parts, wires which have been removed for servicing are reinstalled properly. In addition, check to see if you have not deteriorated parts around the part you serviced, and also check for insulation between each of the attachment plug terminals and the external metal section.
·Cautions to be taken when making adjustments
WARNING CAUTION
1. Use caution to avoid shorts due to the probe of an oscilloscope or jigs and do not touch high­voltage circuits directly. (There is fear of causing a fire or your getting an electric short accident)
·Cautions to be taken when replacing electrical parts
WARNING CAUTION
1. Parts marked with are important for maintaining the safety of the product. Use specified parts when replacemzent of such parts is required. (There is fear of giving off smoke, catching fire, or your getting an electric shock)
·Cautions to be taken when soldering
WARNING
1. Do not try to solder when the parts are energized or the unit is turned on. (There is fear of causing fire or your getting an electric shock.)
2. Use caution not to touch heating parts like the radiating plate directly. (You could get a burn.)
2. Use caution not to damage t he LCD unit when handling it.
2. Use caution not to damage peripheral parts and lead wires (e.g., burning peeling of coating). (There is fear of causing a fire or your getting an electric shock accident.)
CAUTION
1. Use caution not to touch a soldering iron directly. (You could get a burn.)
3. Use caution not to have the wrong direction when installing parts, if they need the installation of a correct direction. (There is fear of causing a fire.)
5. Some parts need to be installed at a specified intervals or by a specified method for safety purposes (they may be a bit floated from the board for dissipating heat.). They must be reinstalled to the original conditions. (There is fear of causing a fire or your getting an electrical shock accident.)
2. Make sure the radiating plate or heating parts are cool enough not to get a burn before touching such a part. (You could get a burn.)
4. Use caution to avoid shorts due to an improperly cut length of parts’ lead legs after soldering and exercise care not to cut your finger with the edge of cut surface. (There is fear of causing a fire or your getting an injury.
6. Use caution to solder in a correct manner so that areas other than the part you want to solder are contaminated with solder, like a solder ball or bridge.
·Cautions to be taken when disassembling or reassembling the unit
WARNING
1. Prior to servicing, make sure to remove the power supply plug. (You could get an electrical shock accident.)
3. Before servicing, make sure you know the locations of high-voltage parts. (You could get an electrical shock accident.)
CAUTION
1. When disassembling or reassembling the unit, make sure to put the front cabinet side (LCD uni t side) downward and carry out work using caution not to get your fingers caught. (Since the LCD unit side is heavier, there is fear of your getting an injury due to tipping or falling.)
3. When disassembling the unit, use caution not to get a burn because radiating plates and areas around lamps on the PWB are hot immediately after unplugging. (You could get a burn.)
5. Pay attention to burrs or edges of the resin (cabinet and PWBs) and metal (chassis and others) parts. (You could cut your finger with them.)
2. Use caution not to touch the inside of the product with a wet hand or foot. (You could get an electrical shock accident.)
4. Do not work on an unstable place or with t he stand put upright. In particular, fix the cabinet before replacing PWBs or fan. (There is fear of your getting an injury due to tipping or falling.
2. Use caution to avoid a reaction due to your applying too much force when removing or reinstalling screws. (You could get an injury.)
4. Use caution not to get you fingers caught in the stand pole, between the stand and angles or under the cabinet. (You could get an injury.)
6. Use caution to the deformation of the grounding spring or the displacement of the ferrite core. (There is fear of causing radio noises to other equipment.)
·Cautions to be taken when replacing fluorescent lamp
CAUTION
1. Make sure the fluorescent lamp is cool enough not to get a burn before you are going to touch the lamp or areas around it. (You could get a burn.)
3. Use caution not to break the fluorescent lamp when handling it. (You could get an injury.)
2. Use caution to avoid a reaction due to your applying too much force when removing the connector. (You could get an injury.)
CHAPTER 1. OUTLINE OF THE PRODUCT, NOMENCLATURE AND
FUNCTIONS
[1] Features
· 38 cm [15 type] 1024-dots x RGB x 768-line Anti-Glare and Low-
Refrection TFT color LCD panel
· 200 cd/m
2
high-luminance design
· Connectable to analog RGB output (for CRT)
Multi display mode function that supports resolutions from 640-dot x RGB x 400-line to up to 1024-dot x RGB x 768-line In modes lower than 800 x 600 dots, it is possible to enlarge the screen that offers smooth and excellent visibility. Supports VESA specification, Power Macintosh etc.
· Up to 16,190,000 colors are displayable
· Automatic screen adjustment
· The display timing and RGB gain can be more finely adjusted due
to the OSD guide function, in addition to the automatic adjustment function.
· Power management function
· Supports Plug&Play (VESA:DDC1, DDC2B specifications)
[2] Safe servicing and safe inspection,
<When servicing or inspecting, observe the safety instructions.>
1. Observe the cautions.
Locations which require a special caution carry safety instructions using labels and stamps on the cabinet, chassis and components. When servicing, observe the instructions on such labels and stamps as well as those in the Instruction manual.
2. Exercise care not to get an electrical shock accident.
Some parts have a high voltage inside the unit. Use caution when handling them while they are energized.
3. Use specified parts.
The component parts of this unit have safety characteristics such as flame resistance and dielectric strength. Use replacement parts which have the same characteristics as those of the components parts used for this unit. In particular, component parts marked with ! in the circuit drawing parts list are important for maintaining the safety of the product. Make sure to use specified replacement parts.
4. Reinstall component parts in their original locations and return wires which have been rerouted for servicing purposes to their original positions.
Some component parts use insulating materials such as tubes or tape for safety purposes, or are mounted, a bit floated, on the printed wiring board. When rerouting inside wiring or clamping the wires, use caution not to bring the wires too close to heating or high-voltage parts. Make sure to return inside wiring to their original locations.
5. Check for safety after servicing.
After finishing servicing, check whether the screws, parts, wires which have been removed for servicing are reinstalled properly. In addition, check to see if you have not det eriorated parts around the part you serviced, and also check for insulation between each of the attachment plug terminals and the external metal section.
[3] Specifications
1. General specifications
Name of the product: LCD color monitor
Item Specifications
LCD display device 38 cm [15 type] super V & low reflective
black TFT liquid crystal Picture element pitch 0.297 mm (horizontal) x 0.297 mm (vertical) Display area 304.1 mm (horizontal) x 228.1 mm (vertical) Number of picture
elements Display color 16,190,000 colors (max.) Input vide signal Analog RGB (0.7 Vp-p/75W) Input synchronizing
signal Input terminal 15-pin mini D-sub connector Plug&Play VESA DDC1/DDC2B Power management
function Working temperature 5 ~ 35°C Power supply D C+12 V, 100 AC 50/60Hz (when the
Power consumption 22 W (when USB hub is used) /max. 30 W
Outer dimensions about 362 mm (width) x 185 mm (depth) x
Weight approx. 5.2 kg Accessories AC power supply cord (1), Instruction
· Specifications and a part of the appearance are subject to change
without notice.
1024 x RGB x 768 dots
Horizontal synchronizing signal TTL level
Compatible with VESA DPMS
adapter is used)
(when USB hub is used)
343 mm (height)
manual (1), warranty (1), adjustment disk
(1), USB cable (1)
2. Technical specifications
Item MIN TYP MAX Unit Power supply voltage AC 90 100 110 V Working temperature range +5 +35 °C Storing temperature range -20 +60 °C Humidity range 20 85 %RH Visual angle range Vertical (CR
Horizontal (CR Contrast ratio(CR) (q = 0°) 200 300 — Response speed Leading (tr) 10 25 ms
Trailing (td) 35 50 ms Screen white chromaticity (X) 0.283 0.313 0.343
(Y) 0.299 0.329 0.359 — White surface luminance (Y
) 150 200 cd/m
L
Module model number LQ150X1DR10
Specifications and a part of the appearance are subject to change without notice.
[Power management]
This unit supports DPMS*1 Energy Star*2. To use the power management function of this unit, t he video card
and the computer must be compatible with the DPMS specifica­tions.
*1 DPMS:Display Power Management Signaling
5) +40 ~ -50 +60 ~ -60 Temperature
5) 60 70 Temperature
2
DPMS mode Screen condition Power consumption Horizontal synchronization Vertical synchronization ONSTATE Displayed state approx. 22 W * Yes Yes STANDBY SUSPEND Yes No
No display approx. 3 W
No Yes
OFFSTATE No No
At the time of the USB hub un- use
*2 Energy Star: We are a partner company of the International
Energy Star Program. We judges that this prod­uct conforms to the guidelines of the International Energy Star program.
The International Energy Star program is a guideline introduced by the Environmental Protection Agency that promotes energy savings of office equipment including computers. It aims at pro­moting the development and use of products with a function that suppresses energy consumption efficiently. Companies can par­ticipate voluntarily in this program at their own discretion. The products that are allowed to participate in this program are office equipment including computers, displays, printers, facsimile and copiers, and the same criteria and marking (logo) are used among partner countries.
[DDC*3(Plug & Play)]
This unit supports VESA’s DDC specifications
3
This monitor supports VESA DDC* The DDC is a signal standard for ensuring plug&play function between the monitor and personal computer and sends and re­ceives information on resolution and others between the monitor and personal computer. Plug&Play function can be used only when the computer supports DDC and is configured to detect a plug&play monitor. Some DDC types are available according to different communica­tion protocols. This monitor supports DDC1 and DDC2B.
3
*
Display Data Channel
standard.
[4] Nomenclature and functions
[Front part]
MENU
This button is used to pop up, select and close the OSD menus.
SELECT
This button is used to select the OSD options.
These buttons are used to:
1) Adjust the value of the selected OSD option;
2) Adjust the brightness of the backlight while the OSD menus is not displayed.
Panel Power Button
This turns the panel power ON or OFF.
Power LED
This indicator illuminates when the power is turned on.
[Side part]
Main Power Switch
This turns the monitorÕs main power ON or OFF.
Connector Cover
USB Downstream Ports
These ports are for connecting the USB devices.
[Rear part]
Stand Cover
USB Upstream Port
This port is for connecting a USB downstream connector on your PC or a USB hub.
Back Cover
Power Connector
This is for connecting the power cable.
Signal Cable
This is for connecting the monitor to the VGA connector of the video source (PC).
Lock Anchor
This is an anchor hole for Kensington type security lock.
CHAPTER 2. REPLACING LAMPS (Removing LCD module)
[1] Replacing lamps
· After removing the LCD module from the unit according to 2. Re-
moving the LCD module, replace the lamp units.
· Replace the lamp units using the following replacement procedure,
referring to Fig.1 (enlarged view) and Fig. 2 (overall view).
· There are two lamp units at the top and bottom of the LCD
module.
· Wear finger sacks when doing this work, not to contaminate or
damage the LCD panel. Use caution prevent the entrance of dirt or dust into the module.
[Replacement proce d u re]
Turn the module over and remove the screws A in Figs. 1. (1 screw for each unit). Put a finger on the concave B and remove the lamp unit in a straight line.
· Use caution not to apply undue force on the lamp.
Replace the lamp unit with a new one. Reinstall in the reverse order of disassembly.
· Tighten the screw and make sure the lamp unit won’t move.
Drawing direction
B
Screw A
Fluorescent lamp lead wire
[2] Removing LCD module
Procedure
Disassembly
1. Remove the 2 screws in cabinet).
· A connector is removed so that stress may not be applied to
the control circuit board cable when a front cabinet is removed.
· Use caution not to break the latches in when removing the
front cabinet.
and remove the display mask (front
2. Remove the 8 screws in
and remove the module.
· Use caution not to drop the LCD module.
3. Remove the 2 screws in from the module.
Reassembly
Reassemble the LCD module using the steps from 1 to 3 in re­verse.
and remove the LCD cable connector
· Use caution not to get the cables caught in the cabinet when
reassembling.
1
2
3
Front cabinet
5
4
Upper fluorescent lamp lead wire
Screw A (upper)
CN2
CN2
Lower fluorescent lamp lead wire
Screw A (lower)
Fig. 2
Cover
CN1
Cover
Tape
LCD module : VVLQ150X1DR10 Lamp umit : DUNTH2162TPZZ
CHAPTER 3. CONNECTION, ADJUSTMENT, OPERATION AND FUNCTIONS
[1] CONNECTING POWER SUPPLY AND
COMPUTER
· Make sure both the LCD monitor and computer are OFF.
Connect the signal cable to the analog output terminal of the computer. Make sure to tighten the connector screws of the cable.
Connect the power supply cable to the wall outlet. Turn on the main power switch of the monit or and then turn on the
computer power switch. When the monitor power switch is turned on, the green power-on
lamp comes on and the screen appears. Adjust the screen
Automatic screen adjustment
After using the monitor, turn off the main power switch.
Rear view
To the computer
[CAUTION]
· When removing the power cable, make sure that both the com-
puter and the monitor are OFF and hold the connector, but not the cable.
· When you are going to connect the monitor to a Power Macintosh
machine, you might need to a commercial Macintosh conversion adapter.
To the AC outlet
Power cord
Signal cable
cccccccccccccccccccccccccccccccccccccccccccccccccccc @ZapfDingbats, Sffont, RingWorld3
[2] CONNECTING USB CABLE
Rear view
USB Downstream ports
[3] ADJUSTMENT
3-1. AUTOMATIC SCREEN ADJUSTMENT
When the monitor is set up for the first time or when the system setting is changed, make automatic screen adjustment. "CLOCK", "PHASE" and "V-POs" are automatically adjusted to optimal values. When making automatic screen adjustment, make sure that the entire screen is bright.
Carry out automatic screen adjustment as follows:
Press the MENU button once. The [MENU1 ] appears on screen. Select MANUAL on the [ADJUSTMENT] screen. Press the button to select AUTO.
The screen becomes dark and A few seconds later, the screen becomes bright again and the MENU 1 appears on screen.
Menu 1
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ADJUSTING appears on screen.
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Upstream port
USB
This monitor comes equipped with a hub that supports USB standard. The USB hub needs the following conditions:
· The computer to which the USB hub is connected and its OS are
compatible with USB standard.
· Or, the USB hub to which this USB hub is connected is also
connected to a USB-compatible computer (and OS).
When connecting any USB device to this monitor, use the USB cable supplied with the monitor and observe the following conditions:
Connect the down-stream of a USB-compatible computer (or other USB hub) with the up-stream of this monitor using the USB cable.
Connect the USB-compatible peripheral device to the USB down-
stream of the monitor. [CAUTION] Some USB peripheral devices might function properly depending
upon the type of computer, OS or peripheral equipment. For whether the device you want to connect is USB compatible or not, consult the manufacturer of the device.
The USB device connected to the USB connector of the monitor operates when the main power supply is ON, even if the monitor is in the power save mode or if the power switch on the front part of the monitor is OFF.
USB-related specifications
USB standard Rev. 1.0 complicd self-powered hub Down-stream supply power 500 mA for each port (MAX.) USB port Up-stream x 1 (rear part), down-
stream x 2 (side part)
Menu 1
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ADJUSTING
appears
Menu screen appears again.
The automatic screen adjustment has been thus completed. Usually, you can use the monitor properly after carrying out automatic
screen adjustment . However, if you feel it necessary to fine-tune the screen, use the adjustment diskette supplied with the monitor and adjust the screen manually.
For the procedure for adjusting the screen manually, refer to the Fine adjustment of the screen.
[CAUTION]
· If the entire screen is extremely dark, you might not be able to
perform automatic screen adjustment in some modes. In such a case, the message
OUT OF ADJUST appears on screen, and the settings remain unchanged. Use the adjustment diskette supplied with the monitor or switch the screen so that the entire screen looks bright and perform automatic screen adjustment again.
· If the video signal from the computer is the composite sync or
sync-on-green, the screen might be adjusted properly after carry­ing out automatic screen adjustment. In such a case, fine adjust the screen manually.
3-2. MANUAL SCREEN ADJUSTMENT
If fine adjustment of the screen is necessary, use the adjustment diskette (for Windows) supplied with the monitor t o adjust the screen manually. If you want to fine adjust computers whose OS is other than Windows, follow the instructions on the screen.
1. OUTLINE OF ADJUSTMENT
Every time the MENU button is pressed, the screen is switched over as follows:
Menu 1 (ADJUSTMENT)
Menu 2 (GAIN CONTROL)
Menu 3 (WHITE BALANCE)
Menu 4 (MODE SELECT)
Menu is deleted.
It changes.
On all the MENU screens, the resolution of the input signal, vertical synchronizing frequency (V), horizontal synchronizing frequency (H) appear at the lower part of the screen in rough values.
The values of "R-CON, G-CONT. B-CON" on the MENU 3 screen are indicated only when "WHITE BALANCE" is in the USER.
On the MENU 4 screen, you can select menu options, but the display status might not change, depending upon the resolution of the input signal.
Menu 1
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Menu 4
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Select the menu option you want to adjust, using the SELECT button. Every time the button is pressed, the highlight moves downward.
Adjust or switch over using or button.
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[CAUTION]
If the button operation is suspended for about 15 seconds dur­ing adjustment, the menu on screen will disappears.
Screen adjustment needs to be performed whenever the screen mode (resolution, refresh rate and others) has been changed. The adjustment results are automatically stored in memory and effect ive after the power is turned off. Therefore, once the screen is adjusted properly, there is no need to adjust the screen every time you use the monitor.
2. HOW TO USE ADJUSTMENT PROGRAM
The following explanation is written on the assumption that the OS is Windows 95/98. In addition, the floppy disk drive is assumed to be drive A.
START
Insert the "Adjustment diskette" supplied with the monitor into drive A.
Open "3.5" FD (A:)" in the "My computer". (In the case of Windows 3.1, open the "File manager" and select drive A.
Double click "Adj_Uty.exe" to start the adjustment program.
ADJUSTMENT
The adjustment pattern as shown on the right sketch appears on screen and adjust, following the instructions on the screen.
END
When the adjustment is completed, press ESC key on the keyboard to exit the adjustment program.
Color pattern
Display frame
White and black lines alternate.
[CAUTION] If your computers display mode is 65000 colors, the gradation of each
color of the color pattern might look different or gray scales look tinted. It is not a problem, but due to the specification of the input signal.
3. ADJUSTMENT ITEMS
[MENU 1] ADJUSTMENT
Adjust "CLOCK", 2PHASE", "H-POs" and V-POs".
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MANUAL: Adjust manually. (Select the adjustment item you want
to adjust using the SELECT button.)
AUTO: The automatic screen adjustment function works t o ad-
just "CLOCK", "PHASE", "H-POs" and "V-POs" auto­matically to optimal values. During the adjustment, the screen becomes dark and indicates ADJUSTING.
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CLOCK
Adjust the pattern that white and black lines alternate so that there is a noise (vertical stripe), using
Horizontal stripes-like noise
or button.
PHASE
Adjust the pattern that white and black lines alternate so that the horizontal stripe noise is reduced to minimum and that the white and black pattern looks clear, using the
Horizontal stripes-like noise
or button.
H-POS
You can move the screen to the right by pressing the to the left by pressing the
button. Adjust the horizontal position
button and
of the screen so that both the right and left frame lines of the pattern appear on screen.
V-POS
You can move the screen upward by pressing the downward by pressing the
button. Adjust the vertical position of
button and
the screen so that both the top and bottom frame lines of the pattern appear on screen.
Make sure to adjust "CLOCK" properly before proceeding with the adjustment of "PHASE".
MANUAL: Adjust manually. (Select adjustment options using the
SELECT button.)
AUTO: The auto gain control function works to adjust the bright-
ness and contrast automatically to optimal values.
The auto gain control function adjust the brightness and contrast based on the brightest color being displayed on the screen. If you use this function without displaying the adjustment pattern on screen, at least a 5 mm x 5 m m white area needs to be displayed on screen. If not, you might not be able to make the adjustment. I n such a case, the message
OUT OF ADJUST appears on screen
and the settings remain unchanged.
Color pattern
To execute the auto gain control function, set to the "COOL, STD, WARM" mode on the "MENU 3. WHITE BALANCE" screen. If the monitor is in the USER mode, the auto gain control won’t work.
BRIGHT (brightness)
Adjust the brightness of the entire screen. The screen becomes brighter by pressing pressing the
button.
button and darker by
You can also adjust the brightness of the light source (back­light) of the LCD monitor. For more information, see "Adjusting backlight brightness."
CONT (contrast)
Adjust the contrast on the color pattern screen on the adjustment program so that all gradations can be displayed. The contrast becomes stronger by pressing the ing the
button.
button and weaker by press-
COLOR (number of displayable colors)
Set the maximum displayable colors (1,6190,000 colors or 260,000 colors)
[MENU 3] WHITE BALANCE
Adjust the color of the screen. The monitor is factory adjusted properly about the color of the screen, and thus there is not necessary to adjust it . If adjustment of the whi te balance is required for any reason, select the adjustment options using the SELECT button and adjust it.
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[MENU 2] GAIN CONTROL
Adjust the brightness and contrast of the screen. The monitor is factory adjusted properly. However, it might need to be adjusted depending upon the type of computer to which the moni­tor is connected. Adjust the brightness and contrast, observing the color pattern of the adjustment program.
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COOL - STD - WARM
You can select the color you want from among the 5 preset modes.
COOL : Bluish than the standard setting.
: A little bluish than the standard setting.
STD : Standard setting
: A little reddish than the standard setting
WARM : Reddish than the standard setting
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