Question about Philips 55P8241 55" Rear Projection Television

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Red, Blue and Green guns and optics

I'd like to get to the innards of the optics to clean off the accumilated dust. I had the lower back off once but didn't pay any particular attention as to how I might access the guns to clean them. Are the guns coated with anything that might come off if I try to clean them? The unit is over six years old and I haven't had any problems with it.

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On a Philips 55P8241 I would remove the lower grill, (just pops off), then remove the screws at the base of the screen and lift the screen off... Be VERY careful setting it down... You are then inside the main projection. Claen the mirror, cans and lenticular screen with windex and a soft paper towel and reverse the process putting it back together.. Good Luck Bill

Posted on Jun 11, 2007

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Posted on Jan 02, 2017

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1 Answer

Why are gun scope/sight reticles normally red in color?


The illuminated reticles of optics are generally red and green to allow for better contrast against various dark backgrounds while also not sending a piercing light into the eyes of the shooter. Red and green are also typically not as noticeable from the barrel side of the gun as a color such as white would be.

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1 Answer

Vertical blue line on scans


Could be dust or some kind of dirt in window or the optical unit. Clean both upper and lower window. Furthermore you need to take apart and clean the optics.

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Turned on tv and it looked like 3d. Found red horizontal convergence lines extremely bowed. Cannot correct with magic focus either in auto or manual. What is the fix and what is more cost effective ......


TAKE OFF THE FRONT PANEL AND FIND THE FOCAS ELECTRONIC FOCAS CONTROLS. USUALY BETWEEN THE LEFT SPEAKER AND THE FIRST CRT GUN. PAUSE A DVD WHEN THE CREDITS GOING. OR USE A MENU IN YOUR SAT RECEIVER TO LOOK AT. USEING THE GRID IN THE TV SOMTIMES IS NOT ACCURATE. YOU WILL SEE 6 SMALL KNOBS (RED,GREEN,BLUE)FOCUS AND(RED,GREEN,BLUE)SCREEN DRIVE .FOLLOW THESE STEPS 1 TURNDOWN RED AND BLUE SCREENDRIVE 2 FOCUS THE GREEN (YOU SHOULD SEE SCANLINES) 3 TURN DOWN THE GREEN SCREENDRIVE 4 TURN UP THE RED SD UNTILL YOU SEE RETRACE LINES THEN BACK IT OFF TILL THEY ARE GONE. 5 FOCUS RED (UNTILL YOU SEE SCANLINES) 6 TURN RED DOWN AND TURN UP BLUE 7 FOCUS BLUE (BLUE WILL NOT BE AS GOOD AS RED+GREEN NOW YOU ARE IN FOCUS, NOW YOU NEED TO GET SCREENDRIVE BACK THE BEST WAY IS TO, PAUSE A DVD ON A BLACK SCREEN SELECT PLAY MOVIE AND HIT PAUSE RIGHT AFTER . TURN ALL THE LIGHTS OFF IN THE ROOM AND USE A SMALL FLASHLIGHT TO ADJUST SCREENDRIVE SO YOU DONT MOVE FOCAS BY MISTAKE. THE TRICK IS TO END UP WITH A VERY FAINT GRAY SCREEN WITH EACH COLOR UP AS FAR AS YOU CAN WITHOUT SEEING ANY COLOR ON THE TV. WHEN YOU GET THIS TRY PLAYING THE MOVIE. MAKE SURE THE BRIGHTNESS AND CONTRAST IN THE TV ARE AT A NORMAL LEVEL BEFORE YOU START . COLOR,BRIGHTNESS,AND FOCUS IS NOW SET TO YOUR DVD PLAYER.DO A FINAL CONVERGANCE AND YOU ARE DONE!
IF YOU CAN'T GET A COLOR TO FOCUS YOU MAY HAVE TO DO THIS MANUALY. SOME TV'S YOU CAN LOOSEN THE NUT ON THE CRT LENS AND MANUALY FOCUS IT. (LIKE AN OLD CAMERA). IF YOU GET THIS FAR YOU MIGHT AS WELL CLEAN THE LENS WITH A VINEGER BASED GLASS CLEANER (SPRAY THE RAG NOT THE TV) TAKE A LOOK AT THE MIROR, CLEAN IF NEEDED. IF THE MIRROR IS REAL DIRTY THEN THE SCREEN MUST BE BAD TOO.TAKE THE SCREEN OFF AND CLEAN THE BACK SIDE IF NEEDED. LOOK INTO THE LENS AT THE PICTURE TUBE YOU SHOULD SEE A NICE BRIGHT CLEAN PICTURE IF IT LOOKS CLOUDY YOU NEED TO CHANGE THE LIQUID IN THE CRT GUNS.I DON,T THINK YOU WAN'T TO TRY THIS YOURSELF. TIP(I USE A LITTLE ARMOR ALL WHEN I CLEAN LENES, THIS REPELS DUST LIKE IN YOUR CAR) IF YOU CHANGE YOUR FLUID AND WANT TO KNOW WHERE TO GET NEW FLUID I PUT CLEAR ANTIFREEZE IN MY PIONEER TV 3YEARS AGO AND STILL LOOKS GREAT "NOT KIDING" HOPE ALL THIS YOU. IF YOU ARE NOT COMFORTABLE TO DO IT. HAVE IR SERVICE. REPAIRING THIS WILL BE YOUR BEST OPTION>THANKS

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2 Answers

I just recently changed my lamp in my hitachi 50 VF 820 and the screen has a large blue spot on it. I have done it before once or twice and all went well. Did I possibly put the bulb in incorrectly or is...


No. If the set turns on and you have a picture, the lamp is installed properly. Most of the time the optical block is the issue. The lamp shines directly into it. If the picture was good before the lamp was replaced, it is possible that that replacing the lamp might have dislodged some micro dust build up internal to the optical block and it landed in a concentrated area causing the red and green lcd panels not to pass light through as bright as the blue giving you a blue spot. Unfortunately the optical blocks are not designed to be taken apart to clean. Replacing the optical blocks are expensive. Most costing in the area of $700.00 to $1200.00 for the part. It also is a major tear down to get to the optical block to replace it. Once upon a time Hitachi had a couple of recalls on their optical blocks for various models. I do not know however if this qualified.
I hope this helps,
Skyassoc

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1 Answer

Need to clean lenses and do manual focus/alignment of guns on a VS-5055. How do I get access to them and adjust? Thank you.


the lenses are accessable by removing lower back of unit,clean them with a damp paper towel-wipe them off with a dry one.put back back on unit.
screen/focas controls are in front of unit.remove speaker grill remove black cover using phillips screwdriver.you will see 2 sets of controls.one row is focas.one row is screen controls.red,green,blue.turn each focas control slowly to get the clearest picture for each color.screen controls are touchy(if you turn then too high unit will shut off)if the black and white picture was good i would not adjust screen controls.if it was bad turn blue and green screens down all the way.picture is now red turn green up until it turns yellow then turn blue up until it turns white

Sep 19, 2009 | Mitsubishi WD-52525 52" Rear Projection...

1 Answer

Red blotches


What you possibly have is dust on the green or blue lcd panel inside the optics assembly. Since the red is showing through the dust is not as bad on that lcd panel. I suggest having a service center attempt to clean the optics assembly, although replacement of the assembly may be required, some of the light engines are sealed systems.

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1 Answer

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Not tuner........Did you check RGB screen adjust up front
behind access panel?.....Possible CRT issue.............T.

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Use Toshiba STK392-110T X 2 for exact replacement..........T.

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1 Answer

Center adjust on Red gun is not aligning with B&G vert.


frist set blue and green than set red itwill shoew yu single chakall will be focous in single line than than gun will be allign horizontal if it will correct if itisnot comming than cathode problem.

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1 Answer

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You are going to need a full convergance alignment to rectify this issue.

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