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Can't keep backlight on - BenQ Computers & Internet

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Replace LCD Inverter.

about $120.00

Posted on Jun 18, 2008

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Posted on Jan 02, 2017

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I have a 37in, the screen keep going blank for a bout 5 seconds and when it comes back on the constrast goes up to 100


This is a combination of the backlight inverter and the mainboard. It is going into fail safe mode when the backlight is failing and resetting to default settings. I believe once you change out the backlight inverter that your problem will be solved. Also, check for popped capacitors on the powersupply to make sure that the backlight inverter is getting the 24v it needs to operate properly.


Please rate if this helped :)

Mar 11, 2011 | Samsung Televison & Video

1 Answer

I changed the batterys in my 1F78-151 thermostat and now the backlite does not work.....


• Display Backlight - (Not available on earlier models.) The display backlight improves display contrast in low lighting conditions. Selecting backlight ON will turn the light on for a short period of time after any button is pressed. Selecting backlight OFF (default) will keep the light off. Turn the display backlight feature ON as follows: 1. Press TIME and RUN buttons at the same time. The display will show "d-L" and "OFF" alternately

Dec 22, 2010 | Heating & Cooling

2 Answers

Gateway M-1631u screen keeps going to full backlight power


Connect an external monitor to your laptop. If it the image is ok on the external monitor and bad on the laptoop screen it means one of more of backlight/inverter/screen is defective. Have it repaired by a professional.

Oct 09, 2009 | Gateway M-1628 Notebook

2 Answers

I would like the keyboard light to stay on - or always come on when I begin to hit the keys...


Hi,
Go to Options > Screen/Keyboard.
You can adjust the following settings
Backlight Brightness
Backlight Timeout
Automatically Dim BB
Turn on/OFF the auto backlight diming feature

Thanks for using Fixya
proton

Sep 01, 2009 | RIM BlackBerry? Curve 8330 Cellular Phone

1 Answer

I was chaging setting and I turned of backlight


If its just the backlight then you can stay in a well lit area and look at the screen that way to change the setting, also you could try plugging it in to keep the backlight on.

May 19, 2009 | Nokia 1600 Cellular Phone

1 Answer

Backlight flickering


Matrix. Backlight lamp is flicking, you shoud change the matrix. If it is in guarantee, that is not you priblem, but if it is not..... the cheapest way is to find someone to chenge just the lamp. if you can

Apr 28, 2009 | Acer TravelMate 5720-6635 Notebook

2 Answers

Backlight only comes on when the power button is pushed


It doesn't sound like you're doing anything wrong. It sounds like that is the way the unit was designed. It's a power save feature.

Can you see the time on the screen if the room light is on? If not, the backlight won't do you any good anyway.

Unless there is some sort of menu that allows you to change it, you're probbaly stuck with the way it is. It's all in the software thats programmed into the microprocessor and that's almost impossible to modify.

The only thing I could think of is to find the backlight voltage line and power it directly off of the power supply (using isolation diodes), keeping it on all the time. This however requires you to take the unit apart and dive into the electronics - something you may not wish to do.

- Jim

Feb 12, 2008 | Fisher SLIM-1500 CD Shelf System

1 Answer

Sharp Aquos 32


Sounds like one of three things:

1) Mainboard/Tuner problems - although I'm really only saying this because you guys seem to think its associated with your over the air channels.
<br>
2) Power board problems. You power board/inverter may be damaged in some way - blown capacitor or other malfunctions. This is very possible as this could result in the backlight turning off and the screen going black but keeping the keeping the sound. If this is the problem, it will at some time start to happen constantly. Have a pro open it up and look at the power board.

3) The backlight is defective/dying. The backlight is a set of lights that reflects through the LCD panel. If the screen looks black, but you might see a faint picture or you still hear sound, then the backlight is not on. The panel itself could be defective. You can fix it by replacing the whole LCD panel (expensive), replacing the backlight panel itself (need a busted LCD of the same size with a working backlight), or fix the backlight, which is tough and risky.

Most likely its either the power board or backlight. Either way, you need someone to open up the TV and take a look inside. Good luck! Hope it works out.

Nov 24, 2007 | Televison & Video

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