Question about Philips 50P8341 50" Rear Projection Television

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Green and Blue Tubes not lighting

I have done some troubleshooting and found that the "screen" and "focus" module is not putting out for green and blue. Where can I buy a replacement?

TKX, Chris

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  • sepdaddy2 Jan 26, 2009

    my 50p8341a sems to be stuck on bright and a little out of focus. Is there anything I can do nonprofessionalyto fix this problem.

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  • Philips Master
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Www.electronix.com 1-800-223-3205 Part is called focus/screen control block.

Posted on Jan 01, 2009

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3 Answers

Problem with the Toshiba 50H13 50 in. Rear Projection Television. Green tint


The tubes have aged and the colour balance between the tubes has shifted. You will need to redo it using a black/white test image: first the black (the cutoff point), then the white (the gain) on each tube - always start with the green colour. This is done on the final video amplifier of each tube by adjusting the corresponding semiadjustable resistors.

Jun 02, 2011 | Toshiba Televison & Video

1 Answer

I need to know which picture tube needs to be replaced everything on my tv is mainly green


hi I would say blue and red
depending how old is your tv you should check first with screen controls located near
the right side speaker behind the front panel
there are blue red green master screen control along with focus control just turn the controls clockwise and see what happens
if the red and blue do not light up at all the tubes are not involve
good luck

Sep 29, 2010 | Mitsubishi VS-60111 60" Rear Projection...

1 Answer

Hey everyone. I have a Hitachi Rear projection Tv 53udx10b. I just replaced the convergence chips and cleaned all 3 CRT tubes. The picture definitely looks clearer now but the white tint has a slight...


You can try adjusting the color output. There are two ways to do this:
1) In the service menu (I don't know the codes or parameters...) I will not cover this for lack of info.

2) Via the focus block (Very touchy and difficult to get the mix right again if you get too far off)

If you take off the front cover there should be a access panel. Behind that, there should be a small square black box with 6 screws on it. This is the focus block. (At least this is where most of them are located)

It sounds more like you may need more red in the mix or just less blue and green. There is a screw for each color. Do not mess with the focus screws, just the ones labeled 'SCREEN.'

Barely turn the red up.
Use an insulated screwdriver and DO NOT TOUCH the focus block and ESPECIALLY NOT the back of it.
Very HIGH VOLTAGE. I found that out the hard way.

Do not turn andy of these up too high or damage may occur and the TV may detect a short and shut off.

I have found that if the three colors are adjusted in a dark room to where the 3 color spots (R/G/B) are just barely visible on the screen at equal levels, there is a pretty good color balance.

I hope this helps! Just be careful.

Apr 19, 2010 | Televison & Video

1 Answer

Just the blue on my rca projection tv is blurred. on the auto convergeance it says it cant read the sensor. on manual the cross hairs for the blue are oversized and blurred. i tryed tuning in the focus but...


Have you try adjusting your focus/screen drive controls to Tube R/G/B you have a focus/screen drive control block to adjust each Tube 3 controls ontop 3under them top ones are for Focus bottom is for screen drive.Red/Green/Blue Tubes.You might need to replace convergence IC, what is your Model number printed on back of TV?

Mar 24, 2010 | Televison & Video

1 Answer

Flashes green yhen shuts off


Many of these sets had bad picture tubes--they use a red, green and blue crt. Most commonly the blue gives troubles--The tubes are now only available on a rebuild basis--usually not worth doing as the cost is very high.

You may have a bad blue picture tube but there is a way to deal with this first----the set has a black plastic block with six controls---three are Focus(red,green,blue) the other 3 controls are Screen controls(red, green, blue)

Someone has to remove the entire piece on the front of the set below the screen(usually a plastic part) most of the time it is secured with 3 screws on either side of the set in the back; once you remove the screws the entire piece should pull out(pull from right to left(it will not fall off or come out easy--it is held in with several large plastic pegs) With it removed there is an inspection plate with 4 screws-----the screen/focus block is behind it.

You need to look very closely at the block to identify the focus versus screen controls----one row left to right will be marked Focus and the other row leftto right will be marked screen------YOU need to locate the Green Screen control (they are black like the block) With the set on(be careful) go to a video input clip_image001.gif with nothing connected---if you see a green screen as well as the input number turn the Green SCREEN CONTROL SLOWLY TO THE LEFT UNTIL THE green is gone.

If this cures the problem you may only be buying yourself some time----if the picture tube is bad sooner or later this trouble may return----I have seen sets where this was adjusted and the set worked for a year or more with no repeat of the trouble----replacing thetube would likely cost you 400 -500 parts and labor.

I do this here for free so if this has helped you rate this solution.


SD TECH

Dec 14, 2009 | Sony KP-65WS500 65" Rear Projection...

1 Answer

The blue projection light is off, like it has dust on it. so unscrewed the front screen, cleaned the lights now the red and green are blurry looking. any help ?


You probably knocked or moved the focus lenses when you cleaned the lights (these are actually 3 picture tubes) Each lens has a wing nut that tightens to lock the focus in place if this was moved your focus would be off. Does the blue tube light at all? and when the TV's on is the image clear when you look directly into the Tubes? (the image should be bright and clear -not milky.)

Oct 16, 2009 | RCA P52960 52" Rear Projection Television

1 Answer

My 51 inch Magnavox rear projection has red and green overlapping


the coolant is bad inside the blue and green pix tubes-to verrify this you can remove the front edge of the screen(it pulls off-one edge at a time-take out screws to remove screen-after screen is off look down at blue/green tubes pix is bad or not there

Sep 07, 2009 | Philips Magnavox 50ML8105D 50" HDTV DLP TV

1 Answer

Panasonic pt53wx52f reply


No problem happy to help. This can get kind of complicated but I will try to walk you through it. Ok in your original post you said that you cleaned the lenses. There should be three of them these are the top of the tubes. One is the red one for blue and the green one is in the middle. they look like large cylinders. If I could see a picture of the unit when it is on it would be a lot easier. But the easiest way to get to the mechanical adjustment fort the tubes is through the front. Below the screen it should have a cloth front. This is a panel that is covering the tubes. remove this panel (there will be screws in the back and the panel should pop off.) This is the really tricky part below each tube there is a board that is attached to the tube. and above that board usually about three to six inches you should see three round circles with a kind of lip on each one these are the mechanical adjustments. Before you do anything to these we need to find the screen voltage adjustment box it is about 3inX3in usually black colored. and it will have six little knobs three on top and three on the bottom. These can be adjusted using a screw driver. One set of three will be labeled focus and the other screen. They should also have a label next to each knob saying the color B for blue G for green and R for red. It sounded like your green was off too much green maybe make small adjustment very small adjustments to the green focus and the green screen. Usually it is right for brighter left for dimmer if you adjust it to much the tube you are adjusting will go into overdrive and the whole tv will shut off. Adjust it until it looks better then depending on how it looks after you adjust the screen and focus will will have to play around with it it is a trail and error procedure. Then move on to the mechanical adjustment for the tubes the circle looking things. What i usually do is put it on a cross-hatch or some kind of picture that is stationary and has line s in it it makes it a lot easy than doing it on a moving picture. Use the title screen to a dvd movie or something like that. when you are looking at the tubes when the tv is on you will see the different colored tubes red, blue, and green once you have the green tube adjusted through the screen voltage box mentioned earlier to your liking then adjust the mechanical adjustments on the blue and red tubes use the lip on the circles to turn it left or right in small measures. you will see how each circle moves it in a different way. What you are trying to do is over lap the blue and red on top of the green. You will have to play around with this to find tune it it can be very difficult. Let me know if this helps if you still need help after you try this their is another route that could be used but it is hard to be absolutely sure without actually seeing the unit. Good luck

Oct 07, 2008 | Panasonic PT-53WX52 53" Rear Projection...

1 Answer

Green picture


Hi,
I'm not sure about this model but most projection tv's have a focus/screen control block usually located behind the front grille where the speakers are. The grille usually comes off easily. If there are no circuit problems you can adjust the red green and blue picture tubes there. Also the focus. It will be written somewhere screen and focus: Three for screen and three for focus. If you find the screens then adjust them slowly clockwise for increase brightness on the red and blue and you may have to reduce the green. Adjust for best picture. If the picture does not adjust too good then the tubes are weak. Only if there are no circuit problems Hope this helps

Dec 30, 2007 | Mitsubishi WT-42313 42" Rear Projection...

1 Answer

Rear Projection Tv Problem! black and white... Please help


go into menu turn color off see if you have a black and white picture if not adjust red,green, and blue screen drive on controls in back of tv you have red, green, blue it will have focus /screen controls cover each tube do one at a time blue focus and screen drive adjust to clear blue picture do all 3 tubes, then adjust them to where you have a black&white picture once this is done turn color controll back on.Thank You for using FixYa and Have a Nice Day.

Nov 11, 2007 | Toshiba 50H72 50" Rear Projection...

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