Question about Samsung LE40R74BDX 40 in. LCD Television

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Marks on screen

There is a few mark on the bottom of the tv screen how could i remove them

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If its just dirty marks use a solution of 50% deionised water and 50% isopropyl alcohol. Use a lint free cloth and it should lift the marks. Any household polish etc may react with the LCD surface and burn it. If you cant get hold of isopopyl go for branded cleaning kits for LCD TV screens. You'll get these in most electrical stores.

Calum

Posted on Dec 16, 2008

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How to remove black marks from my philips tv


Could you describe where these black marks are and what they look like?Also a model number would help, as if its a Plasma screen then it could be down to image burning on the screen

Jul 19, 2011 | Flat Panel Televisions

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There are marks on my LCD 42" TV ,its on the screen itself.It looks like water marks.It started of small marks and it then it getting bigger.


Things You'll Need:
  • Burn-In Reduction Screen Saver DVD
  • DVD Player
  1. Instructions
    • 1 Plug DVD player into your TV and power on. Make sure you plug the right component cables into their corresponding inputs on the back of the TV. This is usually done by simply matching the colors of ends of the cables with the colors of the input holes on the back of the TV.
    • 2 Turn TV to the proper input to display the DVD. Make sure there is not a DVD in the player.
    • 3 Place burn-in reduction screen saver DVD in the player. Allow a few seconds for the DVD to start playing. A pattern of white "video snow" will appear on your screen. The entire screen should be taken up with this patterm.
    • 4 Run the DVD for at least several hours; this will help wear the TVs phosphors evenly. Depending on how long the image has been burned into the screen, the amount of time you should play the DVD varies a lot. A good rule to follow would be to play the DVD at least four times the period the image has been displayed. If you have an image that has been on the screen two hours a day for a whole month, run the screen saver for at least 240 hours

Jan 17, 2011 | Flat Panel Televisions

1 Answer

The tv came on then the screen went black but there was still sound for a sec. Now the green light keeps blinking and the tv won't turn


Unplug the tv for 5 minutes, then try this. Keep holding the VOL+ and CH- buttons down while you plug the tv cord back into the wall ac outlet till you get sound and picture for a second or two. You should be able to turn the tv on and off with the power button now. Next turn the power button off and unplug the tv for a few seconds and then plug it back in and turn the power button back on. Watch the screen and see if the sound and picture comes on, best to check in a dark room to see better, if sound stays on and picture comes on a few seconds and back off you have a bad CCFL backlight lamp in the LCD panel. This tv hads (10) CCFL lamps part # RLMPLA029WJN1 cost $15.93 at www.partstore.com or $19.49 at www.encompassparts.com in it and if one is burned out it will not let the tv picture be powered on till it is replaced. To check and replace the CCFL lamp you will have to unplug the ac cord from the tv back and remove 10 screws holding the back on. With back removed unplug the wire plug on the power button circuit at top left side of the black LCD screen trim, remove 4 screws holding the top of black trim, lay speakers off it, and release trim clips, (4) at top and (2) at bottom with a flat screw driver, and lower the trim to unclip the LED circuit board at bottom left side on the trim. With trim removed, at top of LCD panel remove the (2) PC ribbon wire clips with thumb nail by lifting up on it to release the flat PC ribbon wire. Lay the tv back on a soft pillow with screen up, and look on the LCD panel front for and remove the (10) silver screws 1/2" long with an arrow mark beside them. Do not remove any gold colored screws or any without marks. The LCD panel screen can now be lifted off, lift the backlight plastic thin sheeting and thick sheet off to see the CCFL lamps. Plug the ac cord back into the power supply inverter circuit board and plug the power button plug wire back in its circuit board on the LCD black trim panel, and power the tv on while looking at the CCFL lamps. If the lamp is dim or burned out, take the (2) white plastic covers off the ends of the lamps with a flat screw driver and unclip the lamp to replace it, Check the lamp socket part # QSOCFA003WJZZ by putting a good lamp in it and if it lights up the sockets are good and the bad lamp was the problem. If all the CCFL lamps do not light up, unclip the top lamps and move them to differant sockets to the center and the center lamps to the top, if the lamps do not light up, then it is a bad power supply inverter circuit board the ac cord plugs into, part # RUNTKA448WJQZ , cost about $160.00 for new one or less if you buy a used one on www.ebay.com , replace it and the tv should work ok then.
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Dec 06, 2010 | Sharp LC-32SB23U 32 in. LCD TV

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Cleaning lady applied to much pressure when cleaning screen. Now I see her swipe marks. Is there a way to remove these marks?


Depends upon what the swipe marks are, exactly.

If they're just residues of whatever she used, then you should try gently wiping the screen down with a clean lint free cloth lightly moistened with a tiny amount of distilled water (the same type used to fill car batteries and steam irons). Re-fold the cloth regularly so that any dirt it picks up does not simply get laid back down elsewhere nor causes scatches. A microfibre cloth is ideal for this as it's also quite effective at lifting silicone wax residues left by many furniture polishes, although it may take a few attempts before the screen is acceptable again.

If the cleaning agent used was abrasive or contained certain solvents then it may have physically damaged the screen. The only cure is to replace the screen but that's rarely cost effective as it's overwhelmingly the single most expensive component of the tv.

If too much pressure was applied then the screen will either recover over a few days or it won't. if it doesn't then your back with the problem of replacing the screen.

In future, never, ever, let ANYONE but yourself dust and if necessary clean the screens of any of your tv's, monitors or similar devices. If you allow them to clean the casings then ensure that they know the correct way to do so (no chemicals, clean slightly dampened cloth ONLY) or do it yourself.


Mar 03, 2010 | Samsung LN-S4692D 46 in. LCD HDTV

1 Answer

My Sony KDE42xs955 was cleaned with windex and now has water marks on the screen that I cannot get off is there a trick to removing these? They look like the marks left on a windshield after going through...


Hello,

Assuming you have removed the coating with the cleaner, (TV is much brighter where the marks are)

If you have home insurance then now is the time to call.

The TV, being an LCD, has a coating on the front, kind of like paint, but not. It is what allows an LCD TV to produce "Black", by blocking the light.

It is not easily replaceable as it is sprayed on at the factory.

Sorry.

Sep 07, 2009 | Sony Flat Panel Televisions

1 Answer

Black marks on the screen that won't come off when cleaned


some marks on screens can be caused by gamestations played on the tv. these will never come out as they are burt on to the screen/
other marks can be caused by home heating appl.also none removeable- if you cannot clean them off by hand I would say that you may be stuck with them.sorry.

Aug 07, 2009 | Sharp Aquos LC-42D62U 42 in. LCD HDTV

3 Answers

Apex Digital TV Model: 1919. Worked fine for a


Power supply issues or shorted horizontal output transistor. Probably not worth having repaired unless you DIY....

May 17, 2009 | Apex Digital LD1919 19 in. LCD TV

1 Answer

New lcd tv with a crack like mark on the bottom of the screen


Hello. If the panel is cracked (the glass of the LCD), the by all means, return it as soon as possible. I've seen quite a few LCD's with cracked panels, and they all came from shipping from the factory.

The easiest way to tell is if you can see it when the television is off. If you can, it is in the panel itself. Sometimes you have to look with a flashlight to tell, but it should be present.

Dec 29, 2008 | Samsung (LTR268W) Television

3 Answers

Half the screen has gone black


Ok first lets start with the half screen and no lit screen . Samsung plasma panels (S42AX-YD01) HD V4. are really bad about the Y-board (upper,lower) buffers are really bad about getting hot and burining up. If u remove the back cover of TV u will see on the left side the Y-board (it will be marked in small letters) if u look and the rows of IC's with heatsinks on the buffers will be a dark yellow. Majority of the time if u remove the buffers. and look underneath them u will see the solder has melted from the board. U can replace the Y-board and buffers and the TV will work fine.
Next part if u have vertical lines in the panel. There is not much u can do as a repair. Only thing u can do is get panel replaced. because there is and IC that is burned up on the panel, and trust me there isn't anything u can do to fix it. If u want to see for yourself. After removing the back cover, remove SSB, and brackets holding PDP in place. at the bottom of TV there is a row of buffers marked E,F,G, ( i think) there is a long heat sink covering the IC's at the bottom connected to the bottom of PDP. As u can see without a $70k machine to change this there is not much u can do with it. Hope this helps.

Dec 22, 2007 | Philips 42PF7320A 42 in. Plasma HDTV

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