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Screen blanks out on certain positions on laptop

I have a sharp Laptop - PG10 CH and when i move the screen the backlight goes out. It only works in a few positions.

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This sounds like you have a short in the LCD ribbon cable and it will need replacing, in most cases you will have to replace the screen but if you can find the exact ribbon cable, replacing should do the trick.

Posted on Nov 16, 2009

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1 Answer

Laptop screen flickering


The video inverter may be failing, BUT...

More than likely the backlight is failing. If you can still see a VERY faint image on the screen this is almost certainly the problem.This is a very difficult fix. I recommend a replacement LCD.

It MIGHT be a bad lcd cable. With the laptop on, slowly open it from closed to open and back again and see if there is a position where the laptop screen does not flicker or turn off, [or if it does turn off if it turns back on.

If the screen goes COMPLETELY black then your GPU is failing.

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Sounds like the backlight is broken If it works with an external monitor the backlight needs to be replaced will cost you about 100$ sorry

Nov 13, 2009 | Computers & Internet

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I think there is a loose wire from the laptop hinges to the screen backlight when i open the laptop it only lights at a certain position and have to move the screen back and forth to get the light on


dodgy conection to the screen inverter take off the screen surround 4 poss 6 screws located in each corner of screen and poss 1 behind each hinge in the middle at bottom of screen make sure the pink and white wires are connected properly if not press them in if they are the problem is 1 of 2 things either the inverter is faulty or the pink and white wires are either snapped or not connected to the back of screen or motherboard correctly

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Intermitant blank screen on sharp PC-Um10


The thing to do is analyze IF the problem is the machine is going to sleep OR just the monitor portion.

AS A TEST connect an external monitor and see if it winks out as well.

IF IT doesn't then either the backlight power supply is failing OR the monitor power saving setting is corrupt.

ALSO verify that the power cord is not intermittently disconnecting (common problem) as this can cause the screen to be shut down on some setups.

Sep 11, 2009 | Sharp PC UM10 (PC-UM10M) PC Notebook

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Laptop LCD display problem


The backlight is the light bult that illuminates the screen. Before it finally goes out completely it will turn your screen a pink color on startup (and then usually become brighter and the pink fades). It is also possible that the backlight, also called a Cold Cathode Flourescent Light, CCFL, died an immediate death. But usually they take a while and signal with the "PINKNESS" first. If you found that your computer is working just fine connected to an external monitor (and you moved the base of your laptop around while connected to the monitor to be sure and left the computer on for a long time) then you have verified that the screen is the problem. It is usually two things: (1) the inverter, a circuit board that increases the voltage to supply the LCD which eats around 700 volts (yeah baby); or (2) the backlight itself. The first problem is a relatively easy and inexpensive fix. You can find how to replace an inverter by downloading the Hardware Maintenance Manual for the T40, T41, etc., from IBM/Lenovo's site. Replacing the backlight itself, a bulb that is like a strand of speghetti and even more delicate, is a tougher job. I would suggest purchasing a replacement screen in that event rather than replacing the backlight yourself. (The HMM probably does not show you how to replace the backlight/CCFL as it is a potentially dangerous job.) That suggestion assumes you can find a cost-effective replacement screen and do not mind opening the TP and putting the new screen in. At least look at the HMM to see what is involved. Good luck.

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1 Answer

Laptop screen not working


Hi, I'm a laptop technician and if the screen is blank as in there is nothing showing on the screen at all (even when the laptop first starts up), but the laptop sounds like it is starting normally then the backlight or invertor for the laptop screen has probably failed. This is very common.

The easy way to check this is to plug the laptop into a normal PC monitor (if you can) via the monitor out port on the laptop - you may have to press Ctrl + F5 to get a display on the PC screen. If you can get the laptop to show an image on the PC screen then the main laptop itself is fine, and the problem is almost certainly a failed invertor or backlight.

Assuming you *could* see an image on the PC screen, you should then press Ctrl + F5 so that you *can't* see an image on the PC screen any more (this is very important). Next unplug the laptop from the PC monitor (if you did the above) and look VERY closely at the laptop screen. You will hopefully *just* make out a very, very feint and very dark image on the laptop screen. Bear in mind that you may need to re-boot the laptop to get a moving image that you can detect (like the Windows boot up screen for example). If you *can* see a very, very dark and feint image on the screen then the backlight has failed. If the screen is plain bright white or there is no image then the invertor has gone.

The invertor (or inverter as it is sometimes spelt) is a smaller circuit board that sits in the screen housing, the backlight is a very thin "flourescent" kind of tube light that is built into the screen itself. The invertor can be removed and replaced pretty easily by most competent people without much trouble (takes maybe 30-45 minutes to do). The backlight on the other hand is very hard to remove without damaging the screen itself and should only be attempted by a specialist laptop repair company.

Both the invertor and backlight parts are specific to the screen so you must get exactly the same to replace the faulty one with. Online auctions are a good place to get s/hand or new spares, just tap in the *exact* part number or laptop model number and you will usually find someone who has the bit you need.

I hope this helps.

Jan 03, 2009 | Acer Aspire 5002WLCi Notebook

1 Answer

Screen not working


Hi, I'm a laptop technician and if the screen is blank as in there is nothing showing on the screen at all (even when the laptop first starts up), but the laptop sounds like it is starting normally then the backlight or invertor for the laptop screen has probably failed. This is very common.

The easy way to check this is to plug the laptop into a normal PC monitor (if you can) via the monitor out port on the laptop - you may have to press Ctrl + F5 to get a display on the PC screen. If you can get the laptop to show an image on the PC screen then the main laptop itself is fine, and the problem is almost certainly a failed invertor or backlight.

Assuming you *could* see an image on the PC screen, you should then press Ctrl + F5 so that you *can't* see an image on the PC screen any more (this is very important). Next unplug the laptop from the PC monitor (if you did the above) and look VERY closely at the laptop screen. You will hopefully *just* make out a very, very feint and very dark image on the laptop screen. Bear in mind that you may need to re-boot the laptop to get a moving image that you can detect (like the Windows boot up screen for example). If you *can* see a very, very dark and feint image on the screen then the backlight has failed. If the screen is plain bright white or there is no image then the invertor has gone.

The invertor (or inverter as it is sometimes spelt) is a smaller circuit board that sits in the screen housing, the backlight is a very thin "flourescent" kind of tube light that is built into the screen itself. The invertor can be removed and replaced pretty easily by most competent people without much trouble (takes maybe 30-45 minutes to do). The backlight on the other hand is very hard to remove without damaging the screen itself and should only be attempted by a specialist laptop repair company.

Both the invertor and backlight parts are specific to the screen so you must get exactly the same to replace the faulty one with. Online auctions are a good place to get s/hand or new spares, just tap in the *exact* part number or laptop model number and you will usually find someone who has the bit you need.

I hope this helps.

Jan 02, 2009 | Computers & Internet

1 Answer

ACER apire 5050 screen keeps going blank/freezing


Hold down the "Fn" Key and press the "F4" Key, wait a min, press the Enter key on the keyboard... Do this when it happens, the problem is the ribbon cable in the laptop that goes to the screen is loose, If you want to fix permanently, send in for repair to Acer if under warranty.

Dec 17, 2008 | Acer Aspire 5050-3242 Notebook

2 Answers

Sharp Actius A250 PC: Can the screen be replaced?


I'm a laptop technician and this is a very common fault. It sounds like the backlight or invertor for the laptop screen has failed.

The easy way to check this is to plug the laptop into a normal PC monitor (if you can) via the monitor out port on the laptop - you may have to press Ctrl + F5 to get a display on the PC screen. If you can get the laptop to show an image on the PC screen then the main laptop itself is fine, and the problem is almost certainly a failed invertor or backlight.

Assuming you *could* see an image on the PC screen, you should then press Ctrl + F5 so that you *can't* see an image on the PC screen any more (this is very important). Next unplug the laptop from the PC monitor (if you did the above) and look VERY closely at the laptop screen. You will hopefully *just* make out a very, very feint and very dark image on the laptop screen. Bear in mind that you may need to re-boot the laptop to get a moving image that you can detect (like the Windows boot up screen for example). If you *can* see a very, very dark and feint image on the screen then the backlight has failed. If the screen is plain bright white or there is no image then the invertor has gone.

The invertor is a smaller circuit board that sits in the screen housing, the backlight is a very thin "flourescent" kind of tube light that is built into the screen itself. The invertor can be removed and replaced pretty easily by most competent people without much trouble (takes maybe 30-45 minutes to do). The backlight on the other hand is very hard to remove without damaging the screen itself and should only be attempted by a specialist laptop repair company.

I hope this helps.

May 20, 2008 | Sharp Actius A250 Notebook

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