Acer D240H service manual Backlight Unit, Parameter Min Typ Max Unit

Page 48

Product Specification

M240HW01 V2

AU OPTRONICS CORPORATION

 

5.2 Backlight Unit

Parameter guideline for CCFL Inverter is under stable conditions at 25℃ (Room Temperature):

 

Parameter

Min.

 

 

Typ.

 

Max.

 

 

Unit

Note

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CCFL Standard Current (ISCFL)

7.0

 

7.5

 

8.0

 

 

[mA] rms

 

 

 

CCFL Operation Current (IRCFL)

3.0

 

7.5

 

8.0

 

 

[mA] rms

2

 

 

CCFL Frequency (FCFL)

40

 

53

 

60

 

 

[KHz]

3, 4

 

 

CCFL Ignition Voltage (ViCFL, Ta= 0℃)

2000

 

-

 

-

 

[Volt] rms

5

 

 

CCFL Ignition Voltage (ViCF, Ta= 25℃)

1850

 

-

 

-

 

 

[Volt] rms

 

 

 

 

 

 

 

 

 

CCFL Operation Voltage (VCFL)

-

 

900

 

-

 

[Volt] rms

 

 

 

 

 

(@7.5mA)

 

6

 

 

 

 

 

 

 

 

 

 

 

 

CCFL Power Consumption (PCFL)

-

 

27

 

-

 

[Watt]

 

 

 

 

 

 

 

 

CCFL Life Time (LTCFL)

40,000

 

50,000

 

-

 

[Hour]

7

 

Note 1: Typ. values are AUO recommended design values.

*1 All of characteristics listed are measured under the condition using the AUO test inverter.

*2 It is recommended to check the inverter carefully. Sometimes, interfering noise stripes appear on the screen, and substandard luminance or flicker at low power may happen.

*3 While designing an inverter, it is suggested to check safety circuit very carefully. Impedance of CCFL, for instance, becomes more than 1 [M ohm] when CCFL is damaged.

*4 Generally, CCFL has certain delay time after applying kick-off voltage. It is recommended to keep on applying kick-off voltage for 1 [Sec] until discharge.

*5 Reducing CCFL current will increase CCFL discharge voltage and generally increases CCFL discharge frequency. So all the parameters of the inverter should be carefully designed so the inverter will not produce too much leakage current from high-voltage output.

*6 Both CCFLs in the CCFL set (2 CCFL lamps on each side of a panel) is designed for identical phase driving. Reversed phase driving of CCFL set is not encouraged.

*7 For designing CCFL current, it is highly recommanded to use symmetric and consistent sinusoidal wave for each CCFL input current with asymmetric ration of 10% or less in both

postive area and negative area (ie. 0.9*√2*Irms < I1 & I2 < 1.1*√2*Irms) as refer to the following diagram, otherwise proper CCFL functionality cannot be guarantied.

document version 1.0

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Contents LCD Monitor Acer D240H Table of Contents Important Safety Notice Main Features AccessoriesGeneral Operation Specifications Environmental conditions Operating SpecificationSafety, EMC, Ergonomics and Compatibility Requirements StorageOutput characteristics Items Condition Spec Condition SpecReliability Protection characteristics Condition Spec Status Sync Video PowerBacklight Power Supply Items SpecificationMode Chromaticity Coordinate Cool Brightness outputWhite balance WarmInput / Output Signal Specifications AudioUSB in Option HdmiDVI-D VGAItems Condition Specification Timing tableHorizontal Vertical Other Modes Mode Resolution Pixel Clock MHz Sync KHz Sync Hz Ratio Items SpecificationAudio output Spec DDC dataDPF function DPF function introduceNand play photo function Card reader functionMemory card test DPF function test 11.4.1 DPF select photo mode flow DPF setting menu flow Acer Setting menu layer-1 Setting menu layer-2 Setting menu layer-3 Acer Acer DPF System Profile Function Specifications Panel general specificationsFirst Second Third Fourth Control Range Default Value OSD StructureEmea NO-EMEA Depend on timing & S/N OSD Translation Main menu Noemea EnglishDeutsch Français Español Italiano 意大利语Deutsch Français Español Italiano 简体中文 日本語 西班牙语意大利语 荷兰语 芬兰语 Color management OSD scenario OSD language Nonemea EnglishDimension Dimension Spec3Mechanical Specification 2Cabinet Material4Base Mechanical Interface Unit Package Specification Units package Items SpecUnit Packing Vibration Random VibrationGross Weightkg 1S/N LabelCarton label Drop HeightcmPage Flat Panel Specification Product Specification Handling Precautions Display Characteristics General DescriptionOptical Characteristics Unit Conditions Min Typ MaxProduct Specification Tr F Tr R B R G B Functional Block Diagram PCB InterfaceMating Type Absolute Maximum Ratings TFT LCD ModuleBacklight Unit Symbol Min Typ Max Unit ConditionsSignal Electrical Characteristics Symbol Parameter Min Typ Max Units ConditionParameter Min Typ Max Unit Product Specification Signal Characteristic Pixel Format Image Input data format= Odd Pixel Data E = Even Pixel Data Signal Description PIN # Signal Name DescriptionTiming Characteristics Symbol Min Typ Max UnitTiming diagram CLKPower ON/OFF Sequence Parameter Value Unit Min Typ MaxConnector & Pin Assignment Pin AssignmentSignal for Lamp connector Reliability Test Items Required ConditionShipping Label Mechanical Characteristics Ver Ver Exploded Diagram Troubleshooting Bad Screen White Sreen Spare parts List Assy Bezel ,LP2441 Schematics and Layouts If BD LayoutPower BD Layout Acer Keypad BD Layout Touchpad BD Layout Card BD Layout 5Switching Mode Power Supply circuit CF 16 Bit I/F Assembly and Disassembly Main Board S11 Set up the speaker Page S17 Assemble the base with the stand

D240H specifications

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