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Q74A
Service Manual
39 pgs1.25 Mb0

BenQ Q74A Service Manual

Q74A
Service Manual
Q74A Service Manual
Contents
PRECAUTIONS................................................................................................. 4
ITEMS ............................................................................................................ 6
HOW TO CONNECT THE SEVERAL CABLES TO THE LCD MONITOR.......................... 7
▶ Setting up the LCD monitor ..................................................................... 7
ADJUSTING THE MONITOR............................................................... ................. 8
Q74A SPECIRICATIONS............................................................... ....................... 9
▶ Q74A Specifications .................................................................................. 9
DISPLAY MODES............................................................... ............................. 10
PowerSaver..................................................................................................... 10
OSD MENU............................................................... ..................................... 11
▶ Menu Tree............................................................................................ 11
FACTORY SET ................................................................................................ 12
BURN-IN MODE ............................................................................................. 12
INVERTER & POWER ...................................................................................... 13
▶ Inverter & POWER(Q74A)........................................................................ 13
▶ Specification ......................................................................................... 13
▶ Electrical Characteristics ........................................................................... 13
▶ Pin Connection ...................................................................................... 14
TROUBLESHOOTING ...................................................................................... 15
▶ No operating at all................................................................................... 15
▶ Doesn’t display on LCD............................................................................ 16
EXPLODE VIEW ............................................................................................. 18
▶
Q74A.................................................................................................. 18
PART LIST ..................................................................................................... 19
▶ Q74A Mechanical Part List........................................................................ 19
▶ Q74A AD B/D Part List ............................................................................ 20
▶ Q74A FUNCTION KEY B/D Part List........................................................... 23
▶ Q74A FUNCTION LED B/D Part List........................................................... 23
▶ Inverter & POWER BD Part List(FLF1742-20A).............................................. 24
▶ Inverter & POWER BD Part List(FLF1742-20A).............................................. 25
CIRCUIT DIAGRAM ........................................................................................ 26
▶ AD B/D(Q74A)...................................................................................... 26
▶ Inverter & POWER B/D(FLF1742-20A) ........................................................ 31
PCB Layout .................................................................................................... 34
▶ AD B/D TOP SILK (Q74 A) ....................................................................... 34
Q74A Service Manual
▶ AD B/D TOP PATTERN (Q74A) ................................................................. 35
▶ AD B/D BOTTOM SILK (Q74A)................................................................36
▶ AD B/D MASK TOP (Q74A) ..................................................................... 37
▶ AD B/D MASK BOTTOM (Q74A) .............................................................. 38
▶ FUNC B/D TOP SILK (Q74A).................................................................... 39
▶ FUNC KEY B/D BOTTOM PATTERN (Q74A)................................................ 39
▶ FUNC LED B/D TOP SILK (Q74A) ............................................................. 39
▶ FUNC LED B/D BOTTOM PATTERN (Q74A)................................................ 39
Q74A Service Manual
Q74A
PRECAUTIONS
Warning : The following information will help you avoid the risk of electric shock, serious injury, and death.
z Plug the power cord into a properly grounded outlet.
There is the risk of electric shock. z 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. z Do not overload an electrical outlet with too many devices.
There is the risk of fire. z 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. z 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. z 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.
z Do not expose the monitor to the direct sun light. z Do not block the fan louvers.
There is the risk of fire or damage to the monitor. z Do not attempt to disassemble, fix, or modify the monitor.
There is the risk of electric shock or fire. z Keep the monitor away from high temperature, humidity, and dust.
Operating environment = 0 ~ 40 Degrees Celsius
Operating environment = 30 ~ 80 Relative Humidity z 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.
Q74A Service Manual
Caution : The following information will help you avoid the risk of minor ofr moderate injury,or damage to the monitor.
z Use a proper voltage/current level indicated. z Do not clean the LCD with abrasive chemicals.
There is the risk of damage to the LCD.
z Do not scratch and damage the LCD with sharp objects. z Keep the monitor away from objects and electrical appliances that may generate
electromagnetic fields. z Place the monitor on a flat, stable surface.
The monitor may fall and there is the risk of damage or injury. z Unplug the power cord when the monitor is not in use for a prolonged period of time.
Instruction for Cleaning the Monitor
z Make sure the power cord is unplugged. z Do not spill or pour liquid on the monitor.
z 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.
z 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.
Q74A Service Manual
ITEMS
◈ LCD Monitor
◈ Stand
◈ Power Cord
◈ 15pin D-Sub Cable
◈ User Manual
◈ 24pin DVI Cable *1
◈ Audio Cable *2
*1 : For DVI Model Only. *2 : For Audio Model Only.
Notice
Please make sure the following items are included with your monitor.
If any items are missing, contact your dealer. .
Q74A Service Manual
HOW TO CONNECT THE SEVERAL CABLES TO THE LCD MONITOR
▶ Setting up the LCD monitor
No. Name Cable connections
1 Power Power Cord
2 PC 15-pin D-Sub Signal Cable
3 DVI DVI-D Cable *1
4 SPK IN Audio Cable *2
5 SPK OUT External Speaker Cable *2
*1 : For DVI Model Only
*2 : For Audio Model Only
Q74A Service Manual
ADJUSTING THE MONITOR
The Function Control Buttons
How to use the Function Key
Menu Key:
1. First click : The OSD main menu appears.
2. Second click : The OSD main menu disappears.
Select Key : Select a command function.
Down Key :
1. Move the on-screen highlighted comand
item to the next one.
2. Decrease the current option value.
Mute Key : *2
Sound MUTE ON/OFF Button.
Up Key :
1. Move the on-screen highlighted comand
item to the previous one.
2. Increase the current option value.
Auto Key : *1
This will optimize image quality automatically.
MWE Key : You can manually adjust the screen to your
environment on the computer.
ex.) Internet, Games, Movies ...
*1 : For Analog Mode Only , *2 : For Audio Model Only.
Q74A Service Manual
Q74A SPECIRICATIONS
▶ Q74A Specifications
MODE Analog Digital
Type TFT active matrix
17 inch
Size
337.92 X 270.336 (mm)
Pixel Pitch 0.264 X 0.264 (mm)
Panel
Display Color 8-bit (16,777,216 colors)
Basic 1280x1024@60Hz Display
Resolution
Maximum 1280x1024@75Hz 1280x1024@60Hz
Horizontal 31.5 ~ 80KHz 31 ~64KHz
Frequency
vertical 56 ~ 75Hz 59 ~ 61Hz
15 pin D-Sub 24pin DVI-D
Connectors
Speaker Input/Headphone Output(Audio Cable) *1
Tilting Degree (U/D) -5° ~ 20° Degree
Plug&Play VESA DDC 1/2B
Input Internal type : 100~240V AC,50/60Hz, 0.5A
Consumption Under 40W (Speaker Max 4W *1)
Power
Standby mode 1W less
Power Management PowerSaver
Temperature 0~25℃ (32℉~77℉) Environmental
Consideration
Humidity 90% less
Dimensions Outside 387mm * 185mm * 396mm (W*D*H)
Weight 3.9kg
*1 : For Audio Model Only
Notice
This monitor can be installed on any Plug & Play compatible system.
Interaction of the monitor and computer systems will provide the best
operating conditions and monitor settings. In most cases, monitor
installation will proceed automatically, unless the user wishes to select
alternate settings.
Q74A Service Manual
-10-
DISPLAY MODES
Mode Resolution
Horizontal
Frequency(KHz)
Vertical
Frequency(Hz)
Pixel Clock
(MHz)
Sync
Polarity(H/V)
720 X 400 31.468 70.087 28.322 -/+
31.468 59.940 25.175 -/-
35.000 66.670 30.240 -/-
VGA
640 X 480
37.500 75.000 31.500 -/-
37.879 60.300 40.000 +/+
48.077 72.188 50.000 +/+
SVGA 800 X 600
46.875 75.000 49.500 +/+
48.363 60.004 65.000 -/-
56.476 70.000 75.000 -/-
XGA 1024 X 768
60.023 75.029 78.750 +/+
63.981 60.020 108.000 +,-/+,-
SXGA 1280 X 1024
79.976 *1 75.025 *1 135.000 *1 +/+ *1
*1 : For Analog Mode Only.
PowerSaver
State
Power
Consumption
Recovery
Time
LED Color
ON Under 40W - Green
OFF Less than 1W Within 2 Sec Amber
Q74A Service Manual
-11-
OSD MENU
▶ Menu Tree
Main Menu Sub Menu Function Description
BRIGHTNESS Control of brightness CONTRAST Control of contrast H POSITION Control of horizontal position V POSITION Control of vertical position PHASE Control of phase CLOCK Control of horizontal clock
PICTURE
AUTO ADJUST Automatic adjust position BLUISH Color Temperature 9300k (some blue color) REDISH Color Temperature 6500k (some red color) USER RED : 0 ~ 100 GREEN : 0 ~ 100 BLUE : 0 ~ 100
COLOR
AUTO COLOR Automatic adjust color OSD H POSI Moves the OSD Menu OSD V POSI Moves the OSD Menu OSD TIMER OSD display time
OSD
TRANSPARENCY OSD Transparency LANGUAGE Select OSD language RECALL Factory default values INPUT SELECT DVI, ANALOG Mode Change AUDIO Sound Mute On/Off function. *1
MISC
VOLUME You can adjust the volume. *1
*1 : For Audio Model Only
Q74A Service Manual
-12-
FACTORY SET
OSD Menu => Misc => Recall => Yes. Every value changes factory setting value.
After factory set executes, power OFF Æ power ON automatically. You must push the “AUTO” button because of optimum image quality automatically.
When user want factory setting value, you must execute this function.
BURN-IN MODE
If you push the down button more than 5 seconds in disconnected signa l cable status, you can see changed color.
Burn-In mode displays chaged color continually. (white, red, blue, green etc.)
We can check normal operating status of the monitor under mass production.
If you want to finish Burn-In mode, you can turn off the power by only push the power button.
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