Tip & How-To about Televison & Video

How to clean the lense and screen in a projection TV.

When you replace your lamp or do work in your dlp or projection tv you should also clean the lenses and reflective surfaces to allow more light to pass through giving a sharper and brighter image.

Inspect your unit to see how the screen is attached. Most newer units have the screen attached at the bottom with screws. To access the screws you will need to remove the speaker grille. To remove the grille gently pull out on the edge of the grille at a corner until it pops loose. Continue around the perimeter until the grille is removed. Now you should be able to get to the screws.

Remove all the screws at the bottom of the screen and any other screws which obviously appear to be holding the screen on. Grasp the screen by both sides and lift it straight up. You may have to give it a tug to get it started. Once removed lay the screen on the carpet on it's front.

Using a lint free cloth, usually cloth diapers will work, and a glass cleaner with no ammonia, spray the cloth and using a circular motion clean the lenses and mirrors. Be careful when cleaning the lenses as they are plastic and will scratch. Never wipe them with a dry cloth or paper towels. Do not wipe them anymore than necessary but you may have to clean them several times if the lenses are very dirty. Clean them until you see no streaks or smears.

If your mirror is foil be very careful how much pressure you apply. If your mirror is glass cleaning will be no problem but be careful not to break it. Foil mirrors generally require several cleanings and a light touch.

Never spray any of the parts with the cleaner!!! Always spray the cloth away from the unit then wipe the parts to be cleaned in a circular pattern.

Remember to clean the rear of the screen being careful not to apply too much pressure. Do not get any liquid between the screen surfaces which are usually comprised of three parts. Less cleaner here is better.

When all surfaces shine and are free of dust, reassemble the unit and you should have a much better picture.

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hardrocko

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1 Answer

First when I turn it on it's okay for a few minutes ,then it starts to flicker and shuts off.Three lights are on Standby/Temp/Lamp Temp and Lamp lights are blinking.


Try unplugging the TV. Remove the back panel and vacuum the dust out. Sounds like the unit may be overheating and the thermal shutoff is operating to prevent fire. Be careful not to move the projection lenses out of alignment. It is also a good time to clean those lenses carefully. It will improve your picture a lot.

Jun 10, 2015 | Samsung HL-S6186W 61-Inch DLP HDTV

1 Answer

what is causing white vspots on my tv?


As you probably know, your DLP (Digital Light Processing) TV works by projecting Red, Blue and Green light from three LEDs or a color wheel depending on your model, onto the DLP chip which contains rows of thousands of tiny mirrors. These mirrors reflect the colored light through some lenses and other fixed mirrors and onto the back side of the big frosted plastic screen on the front of your TV cabinet. In the neutral position, these little mirrors don't reflect any light onto the back of the screen. If they flex into a certain position they will reflect any light from the three LEDS shining on them. What color depends on which LEDS are on at that moment. Each one of the mirrors is roughly equivalent to a pixel.


Any mechanical thing will eventually fail and if any of these mirrors fails in the OFF position, then no light will be projected to that mirror's target on the big screen. You are not likely to notice one "pixel" on your screen being dark though. However, if any of the mirrors fail stuck in the in the ON position they will continuously reflect all three LEDs light to that mirror's target on the big screen. This little white dot is noticeable and your attention will constantly be drawn to that stuck mirror's white spot. Once one mirror fails it is only a short time before more and more mirrors stick in the ON position and you see dozens then hundreds of white specs. It's VERY annoying.


Fortunately, if you are fairly DYI handy, it's not a big job to install a new DLP chip (or LEDs for that matter) into your DLP rear projection TV. Do a BING search on the internet for the make/model of your TV and something like "how to change the DLP chip" in that make and model. There are plenty of YouTube videos on line that make the procedure very clear. If after watching the video you don't understand the procedure, that's an indication that you shouldn't attempt it. I've replaced two LEDs and the DLP chip on my Samsung 65" TV. That might seem like a bad thing but if you consider that the TV was 7 years old at the time and these seem to be the only parts that fail, it was worth it to more or less make the TV like new again. When you search for the parts, watch out for sellers with low part price but ridiculously high shipping cost. I found that Sears.com had the best price and shipping times for these parts.

Aug 20, 2014 | Samsung HL-S5087W DLP TV

2 Answers

why the white spots on my tv screen. started with one, then two and now up to 9


the reason this is happening and the problem is getting worst is because the DMD board is starting to go bad some of the micro mirrors are getting stuck on the on or off position and the problem is only going to get worst if you want to fix this problem you need to replace the light engine here is a link that will teach you about this projection works

http://www.howstuffworks.com/dlp2.htm

Jun 12, 2010 | Mitsubishi WD-52525 52" Rear Projection...

1 Answer

My samsung projection tv picture is going dark


Hi

the main reason is could be that you lamp is old and needs to be replace, Phillips lamps will give you from 6,000 to 8,000 lamp hours and if you get a generic lamp that will give you from 3500 to 4500 hours let me give you an insite of the lamp technology:
Background UHP Lamps are used widely in DLP and LCD projection displays. The lamps are not extremely complicated
and provide a light source for your television or projector display. Philips lamps have very low failure rate
and are often blamed for another faulty component such as a bad ballast, color wheel, light engine, or
cooling unit. The lamp itself is encased in an enclosure, meant to hold it in place and connect it to the ballast. How It Works The lamp itself typically uses AC current and about 15,000 volts to ignite the lamp's mercury vapor gas. The gases inside the lamp react when electricity charges up the mercury gas creating very bright light. The voltage drops to keep the flow of electricity to the lamp. The lamp works with the ballast to project light into a light engine that separates the colors of the light, then recombines them with an image. The image is then reflected on the back of the TV and then onto the screen. So in other words more likely your lamp needs to be replace ,and you can find this lamps at http://www.purelandsupply.com/Samsung-DLP-TV-Lamp.html or ebay or http://www.discount-merchant.com/SearchResults.asp?Search=samsung%20lamps?click=52978 please keep us posted and good luck Samuel

Nov 13, 2009 | Samsung Televison & Video

1 Answer

dlp tv has smattering of white (and just a few black) squares in upper right hand corner. Thick at corner then thining as spreads. Covers1/4 of picture. The rest of the picture is perfect.


You have a bad DMD board. It is easily replaced but not easily aligned. I would suggest having a technician look at the TV. The DMD board is the board with the million little mirros on it. The white squares indicate a few mirrors sticking in the on position reflecting the light from the lamp constantly. The black are just the opposite reflecting no light at all.

Oct 17, 2009 | Samsung DLP HL-P4663W 46" Rear Projection...

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