Question about Computers & Internet
An external screen works fine, but the built-in screen is black. It will show a normal looking image for 1 second or shorter when the screen configuration is changed or when the screen is turned off and on with the function keys, but then it becomes black again with a low but audible click.
You have to diagnose the problem.......
Right off hand I would say the screen Inverter is bad, but this is just guessing......
Because your laptop may not use a screen Inverter.
It may use LED's as backlighting.
Or, it may have a pinched/damaged video cable.......
An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.....
A Backlight can be a CCFL, (Or more than one), or a series of LED's.
(Light Emitting Diode)
A CCFL is a Cold Cathode Fluorescent Lamp. (Bulb)
Similar to Fluorescent lighting used in homes, and businesses; but on a MUCH smaller scale.
Average thickness is 2mm. That is a little larger than 1/16th of an Inch, or about the width of this capital letter -> O <-
Average length is almost as long, as the LCD screen is in height.
A screen Inverter is used to convert the power, (Electricity), of the laptop; for the LCD screen, and the Backlight.
A laptop that uses a CCFL, (Or more than one), uses a screen Inverter.
A laptop that uses LED backlighting, May or May Not use a screen Inverter.
Seems when the LED backlighting technology first came out, a few laptop models Did use a screen Inverter.
As the LED backlighting technology evolved, a screen Inverter was no longer used.
Average example of a screen Inverter,
The LCD screen is in the Display Assembly.
The plastic frame in front of the LCD screen, is the Display Bezel.
(Different manufacturers use different terms. The above is for HP, and Compaq laptops)
Display Bezel removed, the screen Inverter is located at the bottom of the LCD screen.
That is IF, the laptop uses a screen Inverter.
If the Backlight is bad on a laptop that uses LED backlighting, the LCD screen itself is replaced.
The LED backlighting is built-in.
The Video Cable, (Display Cable, etc), connects to the motherboard, usually under an area under the Keyboard, or just above it. Some models have the Video Cable connecting to the Bottom of the motherboard, and at the back.
Average example of a Video Cable,
The Video Cable then routes through Channels, and Latches; and comes up around the left Hinge.
It then goes on to up into the Display Assembly.
Depending on the technology used, (screen Inverter, or no), the Video Cable splits off, and connects to the screen Inverter.
The rest of the Video Cable then connects to the back, of the LCD screen.
Due to just normal opening, and closing of the laptop; the Video Cable may become pinched, and/or pulled on.
This can cause the connection at the motherboard to become loose, and/or at the screen Inverter, (IF used), and/or at the back of the LCD screen.
It may also cause damage to the Video Cable. (Stretched/Broken)
1) May be just a loose connection/s of the Video Cable
2) May be a damaged Video Cable
3) May be a bad screen Inverter
4) May be a bad LCD screen.
Post in a Comment, as to the laptop manufacturer name, and model number.
This way I can step by step you through diagnosing the problem, for YOUR laptop; and not post a bunch of generic information.
HOWEVER, it does depend on if the information is available on the internet. Such as a free Service Manual, and/or pictorial guides.
I CAN guide you even if there is not, but if there is; it just makes it simpler for you.
I can tell you it is easy. Once you have performed this procedure, you may want to do it for a friend, or relative; if the situation arises.
Posted on Jul 09, 2013
Testimonial: "Thank you. It is an EMachines E727 with 15.6" 1366x768 pixels LCD screen."
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Posted on Jan 02, 2017
Since the laptop works on the external monitor, then it would be safe to assume that it is only the L:CD display part that is the issue. Often LCD display (of laptops) are working but only that you can see the actual display. One way to verify is to shine a flashlight at an oblique angle to the screen, semblance or part of the desktop could be seen. If the desktop could be seen (albeit very very dark background) then it could either be the CCF Lamps (cold cathode florescent) or the inverter that powers the lamps.
Often, the defective component would be the inverter. It is relatively easy to replace the inverted. It is sometimes more difficult and challenging cracking open the casing of the display panel of the laptop than replacing the inverter. Additionally, inverters are readily available online. It is also not surprising that inverters for other brands/models would also be used in your Toshiba.
This would be a good place to start for inverter boards. This is a nice tutorial if you are considering a DIY.
In some worst case scenario, it could be the video interface or even a loose/open flat cable from the laptop's main body towards the LCD display panel.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
Posted on May 08, 2008
SOURCE: mouse frozen in screen center
i presume you still have the manual for that computer.... i believe the newer computers allow you to shut off the touch pad... look for the key combination for that
Posted on Mar 16, 2009
Awesome, I'm glad reseating the lcd cables did the job. Its crazy how the littlest things can cause such a mess sometimes. Your very welcome and when you get the chance, please rate my solution. Hope your weekend is a great one!!
Posted on May 16, 2009
SOURCE: laptop inverter problem
you have major problem here - the power regulator on the motherboard which regulates the line voltage down to 12V to feed the inverter, and battery voltage /up/ to 12V to do the same, is blown. I've seen this happen in HP laptops - line voltage to the inverter on mains power reads at 18.2-18.5V (which overloads the inverter), on battery it reads 10.5-11 (which won't fire the inverter). This is usually a sign of a bigger problem. Usually one that involves replacing the motherboard.
Posted on Jul 21, 2009
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