General Office - normal information About Toshiba Laptop Screens
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normal information About Toshiba Laptop Screens
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Today we are going to discuss the screen display system on any Toshiba laptop.
All Toshiba laptop screens are housed within a shell that is the lid which on the majority of the model range is Plastic Abs. Some lids were made from cast aluminum (Some Porteges).
The screen though is mounted to the lid using a system of rails, these rails are mounted to the lid. There are many rails systems employed in Toshiba Laptops, and some are interchangeable with other laptops, notably the Toshiba Satellite Pro 6000, Satellite pro 4600, and the the Satellite Pro 2100/1400/2410/1410 Series Laptops as an example.
Screen rails are usually constructed of pressed steel to fit the profile for a given size of screen and to enable fixing to the base lid.
The rails are fixed usually by small screws although on some Toshiba laptops you may find that there are no rails de facto fitted to the screen the lid becomes the sole mounting site for the screen.
The front bezel is made from plastic Abs, this is a flat plastic cover which conceals the rails, the screen inverter and protects the screen area from ingress and dust penetration. The bezel is moulded in such as way that it incorporates many snap lugs nearby the periphery of the bezel reducing the need for lots of fixing screws, the lugs will locate and lock the bezel into place. Some older machines used this combination of snap lugs and fixing screws (for example the Tecra S1 series laptops). Most modern Toshiba Laptops use the snap lug fixing method since it is economy to construct and also reduces weight and component count.
For machines that were tablets there was slight departure from the thorough construct because of the complexity of the touch screen and the extra weight that these extra components when assembled. With many tablets the construct of the lid and the front bezel were different to accommodate the feature of rotating the screen through 360 degrees and the newer style of fold flat lids which when lifted up, and then rotated, enables the display facing upwards, resting on the profile of the main base.
The basic components of most screen display systems are,
The Screen
The Screen Connecting cable
The Invertor
The Base lid
The Hinge mechanism
The front bezel
Any wireless or Bluetooth cable systems
Lid latch and return spring assembly
I won't discuss the exact technicalities of tablet screen systems because Toshiba did not de facto standardize in the middle of models so it does not merit any added consulation here.
We have already touched on some of the elements of the screen display such as the lid, the screen rails and the front bezel, I will now move on to the invertor and the other system components.
The invertor primarily functions as a lighting up circuit, its function is to provide power to the cold cathode display tube that is manufactured at the bottom of the Lcd display, this provides a back lighting system so that you can see each and every pixel being displayed on the screen without it the screen would remain dark. More modern machines have much more industrialized electronics fitted into the construct of the invertor, such as screen radiance settings, current overload, screen blanking, sleep adjustment and varied other attributes of which includes bios control as well.
Some screens which are high definition are fitted with two invertors to increase the farranging unlikeness and radiance of the screen and to distribute the power required by the screen tubes evenly. These are usually fitted to screens of size of 17" or larger.
The screen connecting cable comes in four thorough sizes, and is dependent on the capabilities of the screen fitted, its resolution and its farranging size, the cable will provide all the control signals and power lines to the screen interface, detection of the screen type, and the actual display data to the user. The most common cable now found are the 30pin flat connector which is de facto a very low current signal propagated at very high speed and then reflected back into the main system, commonly known as Lvds, we won't discuss the technical details of this system its beyond the scope of this discussion.
The cable is related at the other end to a graphics card switching circuit which enables the user via software or hardware detection to decree the default type of display device. If you plug in an external monitor some Toshiba laptops will default to displaying on the external monitor rather than on the Lcd screen.
The hinge mechanism is an assembly that maintains the integrity of the base lid system and enables the user to adjust the screen position in on dimension, the criteria here is sound an sufficient force to hold the screen upright for extended periods of time and at the same being able to close the lid de facto and without any notchiness or serious restrictions. The construct on many Toshiba laptop hinge systems falls into three categories.
Lid and hinge integrated onto the palmrest
Lid and hinge detaches from the palmrest
Lid detaches form a fixed hinge system on the base
Most modern Toshiba machines now fall into second category, though I feel the first kind was de facto the most durable, this can be seen on the Toshiba Satellite Pro 2450, Toshiba Satellite A40, Toshiba Satellite Pro 4600.Most Toshiba laptop hinge systems comprises of a cast steel pin with an outer sleeve pressed onto the surface to create the friction necessary to force the screen to remain upright, the other end of the pin is then machined with a spline which then is force fitted to the hinge surround, the hinge surround can extend under the palmrest and is then fixed to the palmrest (as in the first category) or movable as in the second category. The hinges also form part of the lid reserve system with a continuous bracket system extends to enable the lid to be mounted to the hinge assembly, cutting down excessive components and weight. The more modern systems include of a cast post material, inserted to the base system and then fixed from the back and the undersides with screws, the hinge itself is part of the cast post system and the spline is inserted into the cast post with large force, the restrictor sleeve is then mounted to the lid frame, this is the more common in the second category. The third kind is not much used these days except for very small light weight laptops where weight and size dictates the screen hinge components.
The lid latch system is a simple latching assembly pre tensioned by a small cylindrical spring, allowing self retraction of the screen lid locking jaw, these are usually a claw shaped plastic component that locks into the base system. Most Toshiba laptops have used many variations of this building and its proven reliable, since all Toshiba lid plastics and hinges components are very accurately made, alignment is maintained even through excessive wear of the hinge system or accidental damage to the lid. This building also reduces wear on the lid locking jaw itself, the locking jaws primary function it that its drive relies on the width of the jaw and the length of the jaw when in the locking position. More modern machines are now bright to the lockess style of building but the palmrest construct and the top lid has now been redesigned to give a perceived and noticeable incline to enable the lid to remain terminated (clam shell design).
Wireless cable systems are usually attached behind the screen on the lid base, their former function is to provide a larger surface area in which to receive the thorough wireless signals, this also applies to blue-tooth cable systems as well. Most wireless cable systems are usually an Rf self adhesive pad this enables the assistance technician to de facto replace a damaged cable.
Well That's it for now!
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