Question about HP f2105 21" LCD Monitor

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How to turn off backlight of an LCD panel?

How to turn off backlightan LCD panel?

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You can turn off the LCD backlight panel by pressing Fn + F2. And you can turn it on by pressing the same key.

Posted on May 10, 2010


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Posted on Jan 02, 2017


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How to replace a hp2159m backlight

It is not recommended to replace the backlight unless you have a clean room. Doing so may introduce dust into the LCD panel module. The LCD panel module is held together by metal brackets with latches. You'll need to remove the two metal brackets that hold the sandwiched LCD panel modules together. The you will have access to the actual backlight. Older panel technology made it easy to slide out the backlight for replacement. Nowadays, they lock up the CCFL into the LCD panel module making it not really possible to do backlight replacements if you don't want to introduce dust into the system.

May 15, 2014 | ViewSonic VP2000s 20.1" Flat Panel LCD...

1 Answer

Samsung 46 " lcd backlight dims and brightens by

there is a light sensor that is for the backlight thatg if you refer to your manual you can find out how to turn it off

Mar 10, 2011 | Samsung LN46A650 46 in. LCD HDTV

1 Answer

Had the LCD TV For 5 Years, no problems, then just before going to bed i was about to turn off the tv when the screen went black but sound was fine. I switched channels and you could hear the channels...

Your problem can be related to either LCD backlight inverter failure or T-con board failure. Please turn on your tv, darken the room and see if you notice a dull glow on the screen. If you see a dull glow then backlight is functional and the t-con is dead. Otherwise it can be a backlight inverter failure(in some cases the backlight itself). In that case I would try replacing the backlight inverter board and hope its not the backlight as the backlight is embedded into the the panel and the only way to replace it is to replace the panel.

Aug 29, 2010 | Televison & Video

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When i turn the t v on i get maybe one second of picture and the screen goes black but i still have sound

Ur LCD inverter backlight board is dead.Replaced this LCD inverter backlight board.U will get picture back.Tries websites, to buy a refurbish LCD inverter backlight board for the replacement.It a long board in shape.

Mar 15, 2010 | Digital Lifestyle FA1B32Z 32 in. LCD...

1 Answer

I turn on my Polaroid Television and the screen turns on and in about 3 seconds it turns to black; however, the power is still on and the volume works what could this be?

Ur LCD inverter backlight board is dead.Replaced this LCD inverter backlight board will get ur picture back.Tries websites, to buy a reburbish LCD inverter backlight board for the replacement.It a long board in shape.

Mar 14, 2010 | Polaroid 1511-TLXB 15.4 in. LCD Television

1 Answer

Screen goes black when i turn it on but can hear sound

Ur LCD inverter backlight board it dead.Replaced this LCD inverter backlight board will get ur picture back.Tries, to buy a refurbish LCD inverter backlight for the replacement.

Mar 13, 2010 | Vizio L32 32 in. LCD HDTV

1 Answer

Tv turns on with sound but no picture

if you have the backlight on but no image it could be the main board but if you don't have the backlight you have a problem with your LCD panel
the panel comes with the T-con board and the Inverter board

Oct 09, 2009 | Samsung LN-S4692D 46 in. LCD HDTV

2 Answers


It sounds like the color wheel has gone bad and needs to be replaced. This is located behind the back panel... replacing a new colour wheel will solve ur problem

thank u

Jul 08, 2009 | Sanyo Televison & Video

1 Answer

Sony KDL-32ML130 lcd tv

Not really that tough. Sounds as though the backlight is shutting down, either from a power supply failure, or a failure of the backlight circuit itself. You can verify this by holding a flashlight to the screen in the area where the menu usually appears to see if it displayed on the LCD panel with no backlight. If you can faintly see the menu displayed, your backlight has shut down and the most likely cause is the backlight inverter board, followed by the power supply and the backlights themselves which are part of the LCD panel. If you found this information answered your questions, please be sure to rate it. Thanks!

Oct 24, 2008 | Televison & Video

1 Answer

Lcd tv backlight prob

You need to replace the inverter board if you can find the spare part. Otherwise you need to replace the whole lcd panel.

Jan 01, 2008 | LG RZ-17LZ40 17 in. LCD Television

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