1. What is a compatible LCD SCREEN?
LCD is very advanced technology. And all Manufacturing Companies are big & known. They manufacture alternative compatible parts with same resolution and same quality.
Laptop LCD screens may be compatible with other laptop LCD screens. Moreover, laptop makers like Dell, HP Compaq, IBM, Toshiba and Sony may source more than one LCD screen (as distinguished by the LCD screen's part number) even from different brand LCD screen manufacturers to install in the same laptop model. There are many variables to take into consideration like various physical constraints, electronic signaling characteristics and power issues.
But do all compatible screens work similarly in all models and all brands? NO NO NO !!! They don't. Sometimes Compatible screen works great in one model and brand but won’t fit in other one. (Not because of technical incompatibility but laptop design -- (short flex cable, needs hinge adjustment etc.). Some screens even don't light up because of inverter settings.
2.How to select the right screen for your laptop screen?
Specific laptop models can come in many sizes and resolutions, backlight type. Laptop LCD resolution should not be upgraded or downgraded. You must confirm that this screen matches your laptop in SIZE, in RESOLUTION and in BACKLIGHT TYPE to order the right screen.
Certain laptop models come in different screen sizes, resolution and backlight. For example, Dell M1330 may have LED or CCFL backlight. Compaq R3000 was released with 15" or 15.4" screen size and these are not interchangeable. Mac book Pro 15" comes in different screen resolutions and they are not interchangeable as well.
You have to check if your laptop screen has the same SIZE, RESOLUTION, BACKLIGHT prior to ordering to avoid incompatibility issues.
Tips: We suggest choosing Dell screens by laptop model or making sure the screen comes with the inverter (see the screen description). No inverter is needed for LED screens.
3. How to measure Screen size?
Screen size is measured in inches diagonally from corner to corner as you can see in the picture below.
TIPS: 1 inch=2.54 cm.
There are different laptop screen sizes according to the standard:
4. How to find out resolution?
IMPORTANT! Please, confirm screen resolution before buying! Certain laptop models come in different screen resolutions. You have to make sure that the screen you need has the same resolution as the one you are buying. Screen resolution refers to just how many pixels are crammed onto your screen all at once.
Put simply, a pixel is a little colored dot of light, many of which go together to make up what you see on your computer monitor. The same laptop model may come in different screen resolutions and listed below are the most commonly used ones:
WXGA 1280x720; 1280x768; 1280x800; 1360x768; 1366x768
WSXGA+ 1680x1050, 1680x945
WUXGA 1920x1200, 1920x1080
TIPS: "W" - means wide screen with the Aspect Ratio 16:10.
There are several ways to find out your screen resolution.
A. Refer to your laptop manual. It should usually be in the laptop specs section. That's the most reliable way.
B. If the manual is not available, you may check the laptop manufacturer's website and find the laptop specs in the Support & Help section using your laptop serial number or model.
Please, search Google for your laptop manufacturer name to find their website.
C. If your computer is up and running, you can check your resolution on-line. Please, note that this on-line tool tells your screen resolution and it only makes sense if you did not change factory default screen settings in Windows or Mac OS.
On-line Resolution Check.
D. The best way to find out which screen you need is to open the display and check the screen model name on the sticker on the back side of the screen. You can also search Google for the screen model to find size and resolution.
5. How to find out backlight Type?
Laptop screen may come in different backlight types. Single and dual backlights use CCFL (fluorescent bulb) to light up the image and require an inverter to power up. LED backlight doesn't require an inverter and uses light-emitting diodes as a source of light.
A. Single backlight means that there is only one bulb, that lights up the screen and the screen has only one inverter connector. This type of backlight is the most common one. Please, see the picture below:
B. Dual backlight means that there are two bulbs in the screen and the screen has two inverter connectors. This type of backlight is not very common. Please, see the picture below:
C. LED backlight used in some recent laptop models and LED screens doesn't have an inverter cable and normally has only one socket to connect a video cable (see picture below).
LED backlight is a relatively new feature; it will usually be mentioned in your laptop specs. Check your laptop tech specs to find out if yours has LED backlight.
6. What is a dead pixel?
The norm defines three types of defects. Type 1 is for pixels stuck in “up position” while type 2 is for those stuck in “low position”. In other words, this corresponds to pixels that remain in white or black regardless of the picture displayed. It may sound disturbing, but this is compensated by the brightness of surrounding pixels which reduces this defect to some effect. There is one type of dead pixel left…
Type 3 concerns sub-pixels. If you take a closer look at your screen you will see that each pixel is actually made of three sub-pixels: one red, green and blue. A type three error designates the malfunctioning of one of these red, green, or blue components. This time the result is a very bothersome red, green or blue dot on your screen!
7.What is the Standard Regarding How Many Dead Pixels is Acceptable?
Applied to different screen sizes, Class II tolerance authorizes the following number of faulty pixels:
8. Left LED Connector / Right LED Connector?
Ordering the right LED screen requires selection of the correct placement of video connector on the back of the LED screen. Ordering based on the part number alone does not suffice here, as LED screens with left connector or right connector may have the same part number. It is therefore very important that before ordering the screen from us, you make sure you are ordering the LED with connector on the same side as your original LED screen.
Please refer to the illustration below on how to determine the side for your connector
As seen in illustration labeled "A", the LED has a connector on the LEFT.
As seen in illustration labeled "B", the LED has a connector on the RIGHT.
9. Inverter Transfer and Installation Instructions - DELL LCDs only
Dell LCD panels are unique and are fitted with special brackets usually located on the top and bottom of your original LCD panel.
99 % of DELL LCD products will always have a special circuit board known as an inverter located on the bottom of your original LCD panel, these circuits in most cases, will sit on a specially fitted metallic housing bracket on the bottom of the panel. These are strictly a design by DELL and serve no serious purpose, Again this is just a matter of design.
For you new LCD replacement you will notice that the bracket has not been riveted / fitted to the top or bottom of your new LCD replacement you have purchased.
When you receive your LCD replacement you must perform the following steps prior to installation.
From your original LCD you must remove the circuit / inverter from the metallic bracket. The circuit will be held in with a small screw and usually reinforced with a small amount of adhesive. When the screw is removed a small flat head screw driver or flat solid object must be wedged between the metal and the circuit so to release the adhesive.
Once you have performed these steps the circuit must be transferred to the new LCD panel. By doing this you must place the panel glass side down on smooth un-abrasive surface so to avoid scratching on the glass. You can use a towel or a paper towel to achieve this. Now you must start the transfer, you will do this by centering the circuit to the bottom of the LCD. Now you must use single sided tape to adhere the circuit to the bottom of the panel. Any type of tape will do, masking tape is a good type to use. One those steps have been done you can perform the installation. Please understand that once the plastic frame / bezel have been re-attached all electronic components will stay completely secure.
10. LED vs LCD Display
We see lately that the displays are named as LCD and LED, but actually there are all LCD (Liquid Crystal Display) displays. So we begin with this idea to explain the differences between these display types.
Single and dual backlights use CCFL (fluorescent bulb) to light up the image and require an inverter to power up. LED backlight doesn't require an inverter and uses light-emitting diodes as a source of light.
On the picture we have one ccfl lamp.
The LED displays are the same as the CCLF LCD, but here the backlight is a series of white LED diodes instead of the CCFL lamps. The main advantage of this types of displays is that here there is no need of inverter because the LED diodes work on low voltage. Also, the power dissipation of this type of displays is very low.
Next we goanna see the difference in the design of this display types.
On the next picture is shown CCFL LCD display.
As we see from the picture, the electronic board is on the top side of the display. With “Data” is assigned the connector where we attach the flat cable. With “High Voltage” we assign the jack that we connect to the output of the inverter.
On the next picture is shown LED LCD display.
As we see from the picture the electronic board at this display in on the bottom. There is only one connector, assigned with “Data” on the picture, but actually with the same cable is distributed also the power supply voltage for the LED diodes.