Question about Panasonic PT-47WX53 47" Rear Projection HDTV

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Three pictures The screen actually has three seperate pictures - green, red, and white. I have been told this might be the picture tube, is this right? If so, is it something that can be easily fixed?

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Hello tdeg64,

This is not a picture tube problem. The problem has to do with convergence. I suspect that your convergence amplifiers are malfunctioning. As to this being repairable? Yes it is. However I would suggest that you get a qualified TV technician to troubleshoot and repair this problem.

I hope this helps,
Thank you,
Shuttle83

Posted on Jan 26, 2008

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Posted on Jan 02, 2017

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No green and yellow colour


Hello
If you see the picture in yellow colour, means that there is no blue colour output from the video drive section in your tv, Yello is the mixtrure colour of red and green. Green is actualy there. blue colour is absent.
To detect this fault, you must open your tv. Just look in to the video output section, can be located at the picture tube base card, which is plughed into it diretly. See for any loose soldering points there. Check whether transisotors are used for red, green and blue output stages, or an Ic or three seperate Ics are used for this purpose. Anyway, blue catode of your picture tube pin gets a hig voltage, and so the blue emission is absent. You just check the voltages at red,gree and blue catodes, at the respective picture tube pins, which can be taken at picture tube base card. All of these three pin voltages must be somewhat equal to each other. In your case, no voltage at blue cathode will be higher that the other two. Check for the reason. It may be due to an open video output transistor [blue], or an Ic, of one Ic if used for the three colour outputs. Check and replace the same, will rectify your problem. Ok
If you have andy difficulty, get it to me through Fixya. Ok
Gopakumar, India.

Nov 21, 2010 | JVC AV-27230 27" TV

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White Raster with thin lines; Sound Ok.


White raster with retrace lines: No picture, Sound OK
(picture tube based telivisions.)

It is a common fault to occur in most of the CRT based telvisions, regardless of which brand it is. There will be sound OK, and a bright screen with thin white horizontal lines across; at about an inch space, all over the screen area. This fault may occur along with colur shades also, like blue screen with white retrace line, red screen with white retrace lines, green screen with white retrace lines. Let us take the first case. A white raster with white thin retrace line acorss the screen. These are call vertcial retrace lines technically. To make it mor understand, we have to go to some picture tube electrode details. There are three colour cathodes for a colour picture tube, Red, Blue and Green. Two girds are there called Focus and Screen. Focus grid is supplied with focus voltage which in turn determine the cocus of picture, and screen grid is supplied with screen volrage which determine the emission of the picture tube; in short. There is a final anode to all the picture tubes, which supplied with Extra High Tension voltage, can be located at the top side of the picture tube, to which the EHT voltage from LOT is connected with the help of rubber ****** and clip. Without these three voltages, EHT, Screen and Fcous, no raster will be produced. Therefore in our case, there is a raster, so, horizontal output section including Line Output Transformer [LOT] is functioning well, and as far as sound is there, tuner and video IF section are working well. In fact, all other section except, video output section is working properly.
There are three cathode points on the base card, marked as Bk, Rk and Gk. Check the voltages of these three cathodes. In our case, it will be very low or approximately equal to zero. When cathode voltages goes low, emission of the CRT increases, is the reason. There must be a voltage between 120 and 135VDC at these points. Find out the reason for this voltage drop is the next step. The video drive voltages in most TVs comes from LOT windings, after rectification and filtering. There will be one reisitor of low value, say one Ohms or so, will be connected series with this winding, in between diode and winding. Check the voltage at the cathode of this rectifier diode first. If found low replace the diode and the smoothin capcitor. The smoothing capacitor will be between 33 and 47MFD 250VDC rating. Replace both of them. If there is volatge, say 200VDC or so, check whether this voltage comes to the CRT base board or not, If not, check the conducting wire, serial resistors; if used for open. There is no chance of transistor shortage at this time as the raster we see is white. If raser we see have a specific colour predominent, that is green, blue or red, check the revalent video out transistors and replace it. It is best to replace all the three video output transisors at the same time with same batch and number.

on Apr 18, 2011 | Televison & Video

1 Answer

Picture is not very clear and the color is faded and can not adjust it


This mite sound crazy but it is time to change the oil in your TV. Yes your TV has three seperate picture tubes on the inside of it. A red tube, blue tube, and green tube. Each one of thses tubes has a clear oil that the light shines through. Over time this oil gets cloudy and distorts the light thus dimming and fadeing your picture please have a tech change the oil in your tubes.

Nov 08, 2010 | Akai PT4250A 42" HDTV

1 Answer

I have a 60 inch Philips tv and the picture is kind of blury and a little red. What is tha caused from?


THREE possible reasons for this:
I will list each and describe for you:

1.) If redish picture go to a black and white channel; is the screen somewhat red or black and White? This is adjustable from inside the set.

2.) If colors are skewed or look like they have a red outline it may be a convergence problem. See attached photo.

3.) Some of these sets develop a problem with the coolant which is used to keep the face of each of the three tubes cool; it is called Glycol. You would have to remove back cover and with set on look into each of the three lens (red,green,blue) to see if you have a clear red, green and blue picture.

Which best describes your problem?

SD TECHf0b8356.jpg

Aug 10, 2010 | Philips 60PP9352 60" Rear Projection...

2 Answers

Screen blury,very pink,green edging on picture almost colorless!


This would be a convergence issue you can run the convergence setup that is in your user manual if that does not work you are going to need service.


thanks

Sep 17, 2009 | RCA HD52W56 52" Rear Projection HDTV

1 Answer

The picture is green


your picture tube is wearing out . there is a way around it it will work for a while .you need to lower the drive for the green . on the board on the neck of the picture tube there are three adjustments marked red , blue, green on the front of the tv turn down the color all the way down . normally you would have a black in white picture but now you have a green and white find the screw adjustment marked green and carefully turn it down untill the picture is black in white and your fixed . adjust color back up .... dont do this repair unless you are confortable working around high voltages a wrong move inside a tv can kill you , this adjusment must be made with power on so you can see the picture as your going ... so this may not be for you . use your own judgement ........Please if this answer helped , please rate this 3 or 4 stars . and keep me in the paid answer department . A 1 or 2 may knock me down into the unpaid ranks. Thanks Cactus Bob .

Mar 26, 2009 | RCA Televison & Video

1 Answer

Please help


I suspect if you have green lines .you have a bad crt. there are three tubes red green and blue i suspect blue tube. tubes cost is around 300.00 to fix.


thanks doctor video


note sometimes you could adjust screen voltage located near the front grill black box . becareful high voltage ony a pro should do.

Jun 14, 2008 | RCA D52W15 TV

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...

5 Answers

Sony KP-57WS500 57 in. Rear Projection Television


Hi Guys

Your problem here has to do with the amount of aging that happens to the three colour tubes - red, green and blue.

Blue actually ages slower than red and green. What actually happens is the green tube deteriorates and due to green being the predominant colour for brightness causes the blue tube`s flyback lines to appear - especially when switching between inputs or when the video is blanked.

No replacing the blue tube will not solve your problem as the tube is actually the best one of the three.

As someone mentioned there is a way to adjust this by removing the speaker grill assembly in front of the set. Doing the service mode adjustment with the remote is not the right way to solve the problem - you would be adjusting the colour gain and off-set values and would seriously be compromising the white balance of the set.

On the left hand side behind the speaker cover you will see a black square block with six adjustment points. Look for the one marked SCR BLUE, Switch the set to a unused input so the blue lines become visible. Now adjust the BLUE point counter clockwise until the lines disappear. A small adjustment should do it, Switch back to a picture and make sure the whites are still white.

This should sort your problem. I would however suggest asking a Sony service centre to do this for you. This is a dangerous thing to do as you will be working close to the 35Kv supply the the anodes of the three tubes.

I hope this answers your question.

Goo luck.

Jun 05, 2007 | Sony KP-57WS500 57" Rear Projection...

1 Answer

Toshiba 65h82


check the screen voltages goinfg to all three tubes. Another thing you could try is unplug the crt socket to the red and see if the other tubes stay lit . There ia a possiblity that the red tube could be over powering and shutting the others off or down.

Apr 18, 2007 | Toshiba 65HDX82 65" Rear Projection...

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