Question about Philips Magnavox 27MS343S 27" TV

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Lcd tv no back light on screen

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Failed backplane power supply, and or failed lamps are the most common cause.

Jerry G.

Posted on Apr 16, 2008

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Posted on Jan 02, 2017

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Soniq PT42SH plasma TV power on. No back light and no pictures


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Jan 08, 2016 | Televison & Video

1 Answer

Hi I have teviono 42" lcd4203id model and tv is white picture nothing on there the TV powers up light comes on but it doesn't bring picture what the fault would be?thanks


TEVION 42" FLAT SCREEN LCD TV MODEL LCD4203ID

www.ebay.co.uk/.../TEVION-42...TV-MODEL-LCD4203ID-/1213...

eBayTEVION 42" FLAT SCREEN LCD TV MODEL LCD4203ID in Sound & Vision, Televisions ' eBay.Missing: white

main board for tevion lcd4203id 42" lcd tv mhdv4201 ... - eBay

www.ebay.co.uk > ... > Other TV & Home Audio Accs.

eBayMAIN BOARD FOR TEVION LCD4203ID 42" LCD TV MHDV4201-ZC01-01 (B) ... Mouse over image to zoom .... *Please open the back cover of TV then check the part number of screen, it would be on white label at back of screen ... of actual item in yourTV as well as check either if it is compatible with your TV model.

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Dec 29, 2015 | Televison & Video

1 Answer

My lcd screen off but sound coming


Hi,
probably the back light inverter of the tv faulty. As you didn't mentioned anything about the brand and model number of the tv, its not possible to know is it an led back light or CCFL back light. Any why if its an led tv the you have to replace the led drive and if its an lcd tv with CCFL back light the you have to replace the back light inverter. Check the video for more details.
LCD TV Repair Tutorial Backlight Inverter Common Symptoms Solutions How to...
www.electro-medical.blogspot.com

Sep 13, 2015 | Televison & Video

1 Answer

My Sony LCD model no CX52 There r white patches and background images are not visible Screen is full of pathes what to do


The LCD television is a flat-panel television which utilizes a Liquid Crystal Display technology. It has two layers of glass which are polarized and stuck together. The liquid crystals are held in one of the layers. These liquid crystals pass, or block the light, to produce images on the screen when the electric current passes through it.

However, the crystals do not produce their own light. The light comes from the series of fluorescent lamps at the back of the screen. There are millions of shutters arranged in a grid, which open and close to release and trap some of the light that is not needed to create images. Then each shutter is paired with a colored filter which produces a sub-pixel. These are so small, that when they combine, they create a single pixel, which appears to be a single spot of color on the screen. With the help of the fluorescent lamps, the images created by the liquid crystals become visible to the viewer.

LCD television produces high image quality. They can be made very thin, which makes them less space-consuming, and the user can hang them anywhere. This makes them appealing to buyers.

LED TV's are actually very much like LCD TV's. They also have a flat-screen which utilizes Liquid Crystal Display technology. The only difference is their source of light, which is at the back of the screen. The LCD TV uses fluorescent lamps, and the LED TV uses LED (Light Emitting Diodes).

There are two types of LED backlighting. One is referred to as Edge lighting, and the other is called Full-Array lighting. With the Edge lighting, the series of diodes are arranged along the outside edges of the screen. When there is power, the light is distributed across the screen. Alternatively, in Full-Array lighting, there are several rows of diodes behind the entire surface of the screen. They provide more control over brightness and dimming, because the diodes can be turned on and off independently.



LED TV's are LCD TV's with a new backlight system. They are newly developed for LCD's, because Light Emitting Diodes are said to give more balance in color saturation, and use less power than the fluorescent lamps. LED TV's are the newest version, and that's why they are currently more expensive than the standard LCD TV's.

Summary:

LED TV's are still LCD TV's. They are just considered to be the newer LCD TV version because of the new backlight system used. The LED TV uses Light Emitting Diodes, while the standard LCD TV uses fluorescent lamps. Although they both still use Liquid Crystal Display technology. The main difference is the part behind their screen, which is the backlight.


Read more: Difference Between LCD and LED Televisions ' Difference Between ' LCD vs LED Televisions http://www.differencebetween.net/object/difference-between-lcd-and-led-televisions/#ixzz2Bb0rIue6

Nov 08, 2012 | Televison & Video

1 Answer

My LG 21 int ch flat screen takes time to show pictures,the red button appears on and sound will be heard but their will be no pictures,they appear after some time please help me.


hi,

You have to check the back light of your lcd TV. All lcd screen have a back light to illuminate the pixels. you can conform is the back light is faulty or not by watching the lcd screen nearby. Watch can you see any image (negative image) on the screen. you have to look very closely. if you see any image on the screen then the back light or the back light inverter is faulty.

first of all check all the electrolytic capacitors in the power supply and back light inverter board.If available then replace these capacitors first.

You have to check the back light inverter board. Normally in lcd monitors you can see three circuit boards. power supply, mother board, and the inverter board. If available then try to replace the inverter board. There are high voltage transformers in this board. There is a chance for its winding get short. You will not get the transformer in open market. Try for the inverter board .
ok

Jun 09, 2011 | LG 37LD450 37 in. TV

1 Answer

The green light comes on but the screen wont light up, meaning the tv wont turn on


hi,
You have to check the back light of your lcd TV. All lcd screen have a back light to illuminate the pixels. you can conform is the back light is faulty or not by watching the lcd screen nearby. Watch can you see any image (negative image) on the screen. you have to look very closely. if you see any image on the screen then the back light or the back light inverter is faulty.

You have to check the back light inverter board. Normally in lcd monitors you can see three circuit boards. power supply, mother board, and the inverter board. If available then try to replace the inverter board. There are high voltage transformers in this board. There is a chance for its winding get short. You will not get the transformer in open market. Try for the inverter board .
ok

Jun 09, 2011 | iSymphony LC24IFH7PB LCD TV

1 Answer

No images only the sound


hi,
You have to check the back light of your lcd TV. All lcd screen have a back light to illuminate the pixels. you can conform is the back light is faulty or not by watching the lcd screen nearby. Watch can you see any image (negative image) on the screen. you have to look very closely. if you see any image on the screen then the back light or the back light inverter is faulty.

You have to check the back light inverter board. Normally in lcd monitors you can see three circuit boards. power supply, mother board, and the inverter board. If available then try to replace the inverter board. There are high voltage transformers in this board. There is a chance for its winding get short. You will not get the transformer in open market. Try for the inverter board .
ok

Jun 09, 2011 | Sanyo 42K30E 42 in. TV

1 Answer

Tv powers on and sound is on but screen is blank


This is an LCD TV right?
Did it sustain any damage?
Can you notice any faint images on the screen if you look really close?

If it is an LCD, and it hasn't sustained any physical damage, that's most likely a problem with the units back-light (a florecent tube behind the TV's screen). It could require replacement, which depending on your model, can be very affordable.
This problem could also indicate a bad inverter (that's a relatively small circuit inside the TV which converts DC power to AC, in order to light the back-light). That can also be replaced fairly easily.
I suppose this all depends on the availability of parts though.

Mar 19, 2010 | Polaroid TLX-01911C LCD TV

2 Answers

Hello, LCD Problem. I have sound but no image. Black screen. No access to the configuration menu. Someone can help me ??


I think your LCD TV lost back light that is why you have sound but no picture to see it as LCD TV requires back light to present picture on its screen.
Please intimate model and brand of your LCD TV to provide you more info.

Sep 17, 2009 | Televison & Video

1 Answer

Light spot on the LCD Screen.


Greetings,
Sounds like the LCD panel is toast. Contact a repair shop is about the only thing you can do.

Jan 06, 2009 | Panasonic Televison & Video

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