Question about Sony KP-46WT500 46" Rear Projection HDTV-Ready Television

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Hello, please try to resolder the green CRT board. Best regards, Arpi

Posted on Jul 29, 2007

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I have a Samsung rear projection 42in. tv, the picture is faded and the colors are not crisp or clean cannot watch it like this what do you think the problem is? Mod# HC-R4241W Year 2005

This is evidently a CRT-type projector TV (the owner's manual provides a convergence procedure and warns against operating the set near magnetic field sources - these distort the picture in CRT displays - but has no mention of changing lamps as used in other types). The first thing to check is whether the CRT coolant fluid has discolored with age or algae contamination. This can be determined by visual inspection of the top of each picture tube.

Inspection procedure
CAUTION: there are potentially lethal voltages present inside the set, even it when it is turned off. Some components, including the picture tubes, can hold a charge for a time after the set is unplugged, and some parts can be ruined by static discharge from your fingers even if the shock is too small for you to feel it. Bottom line: don't touch the circuitry unless you know what you are doing.

First, unplug the set, and remove the back. Look for the three picture tubes (sometimes called "jugs" or "cannons") pointing up towards the curved and faceted mirror in the upper section of the set. These are usually mounted on a horizontal black-painted board or panel above the electronics. At the top of each tube is a lens about 7" across. Through the lens you will see a red, green or blue colored face. Using a flashlight, look down into each picture tube. If you see a muddy yellow cast to the color, that confirms the problem. If you have trouble identifying the picture tubes, make sure all hands are outside the set, plug it in and turn it on. Look for the red, green and blue light sources, but be careful not to touch anything or put anything metallic inside the set while it is plugged in. (Some Samsung models allow you to remove the entire projector screen assembly - everything above the control panel - as one piece. These are relatively simple to work on for this problem.)

If you need to change the CRT coolant, check the link here. Plan on it as a full weekend (or two) project if you want to do it yourself. An experienced rear projection TV tech could do it more quickly since there would not be so much time spent looking for connectors, attachment points, etc.

Oct 27, 2010 | Samsung Projection Televisions

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After the tv is turned on it turns off 3 or 4 times after turning it back on and the screen turns blue for a few minutes before becoming clear. It lasts longer each day.

Many of these sets had problems with 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 left to right will be marked screen------YOU need to locate the Blue 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 blue screen as well as the input number turn the BLUE SCREEN CONTROL SLOWLY TO THE LEFT UNTIL THE BLUE is gone.

If this cures the problem you may only be buying yourself some time----if the blue 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 the blue tube would likely cost you 400 -500 parts and labor.

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


Dec 11, 2009 | Sony KP-65WV600 65" Rear Projection...

2 Answers

On our Sony KP-51WS510 projector television (with HD cable box) when we turn it on the screen goes green and the turns the cable box off and goes blank. Also I noticed the light on the front of the...

when it goes green, your green picture tube is shorting out, replaceing the green tube costs alot of money. these sony's had alot of bad tubes, the red and blue are probably going out too, it will cost alot to fix this, at least $500 even if you find good used picture tubes to put in it.

Sep 19, 2009 | Sony KP-51WS500 51" Rear Projection...

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Popping; sparking of Red Projector to metal frame

Sounds like the red CRT has an internal short. Sometimes happens that the picture tubes develop an internal short and cause arcing. I world CAREFULLY disconnect all of the wires to the CRT and see if the arcing goes away. VERY IMPORTANT!!! there is a high voltage wire attached to each pictur tube, usually a red wire that goes to the side of the tube. You can get a shock even if the TV is unplugged, as the tube will hold a charge for years after the power is disconnected. If you don't feel comfortable doing this, DON"T since the shock is powerful enough to stop your heart.

Oct 18, 2008 | Sony KP-61XBR48 61" Rear Projection...

1 Answer

51 magnavox projection tv-color mixing wrong

The are controls on the inside of the tv above the circuit boards for focus and to turn up intensity of the projector lamps (red, green, and blu). If you turn it up too far all three projector lamps kick off. If this happens, power off the set and turn down the lamp that you turned up. Power it back on and slowly turn the projector lamp up until the picture looks OK. You have to take off the panel on back of set to get to the controls.

Nov 19, 2007 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Red tint on the entire picture

Always try your extended warranty!.....Probable cause = bad
red tube. One adjustment may help---turn down red screen
control, located behind technician access panel in front of set.

Nov 04, 2007 | Mitsubishi WT-42311 42" Rear Projection...

2 Answers

I am told my Hitachi 61SDX01B (UltraVision/Ultrascan) has "Green Geometry"

Sounds like a convergence promblem.

Here are some of the most common symptoms of a convergence problem.

Screen looks 3D
One or more colors can't be adjusted when using the convergence menu.
Screen is bowed in or warped.

Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence or magic focus section.

Try to adjust the convergence.

You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

Its a fairly easy fix on the Hitachi sets.

You can get a repair kit that includes all the parts from The kit includes a photo instruction guide, original Sanyo STK chips, convergence resistors, etc.
Everything you need to fix it yourself.

Oct 15, 2007 | Hitachi 61SDX01B 61" Rear Projection...

1 Answer

Hitachi 61SDX01B

The problem is called green geometry.There is nothing wrong w/the green pix tube.It is critical to get the green geometry

accurate because the red and blue convergence overlays on

the green.If you have more than an alignment issue,that will need

repair before adjustments are attempted.

Oct 15, 2007 | Hitachi 61SDX01B 61" Rear Projection...

2 Answers

Sony KP-51WS500

does it have blue video image?

Sep 29, 2007 | Sony KP-51WS500 51" Rear Projection...

1 Answer

Apparent problem with red projector?

service manual here
I would not replace one stk but all....
more info here:

Aug 23, 2007 | Toshiba 55H70 55" Rear Projection...

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