Question about Hitachi 53UDX10B 53" Rear Projection Television

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Classification of CRTs

Are the CRTs in a 3-tube RPTV monochrome, black & white, or color? How does one distinguish? Why are there red and green filters on two of the tubes but none on the third one?

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Phillips Magnavox 9P6040 C104 tv color adjustment help

If you turn color off and stand back and examine the screen---if it is not black and white but yellow looking you have bad Glycol in the blue picture tube which is quite common.

Easy way to know for sure is with set on and rear cover removed peek with a small mirror at the three lens---don't touch anything with the set on===each tube red,blue, green should have a picture with the set on.

Likely you will find the blue one looks like a floodlight with little or NO image/picture.

May 18, 2012 | Hitachi Projection Televisions

1 Answer

My toshiba 57 inch rear projection tv every once in awhile makes a loud pop similar to a spark noise and the screen either goes black or flickers. do you have any suggestions what is causing this??

THis could be one of the CRTs (Color Tubes) is bad or the high voltage is leaking somewhere.
Toshiba projection TVs have history of yoke problems.
My guess is one of the CRTs is arcing inside. This TV has 3 CRTs red, green and blue. Replacing a CRT is not easy or cheap to buy if you can find it. If you like this try calling a TV technician to track down the high voltage arcing. DO NOT TRY TO DO THIS BY YOURSELF.

Best of luck my friend.


Jun 12, 2011 | Toshiba 57H84 57" Rear Projection...

1 Answer

We have a Phillips rear projection tv, about 9 years old. The color has been getting progressively worse over time. Dark scenes are almost impossible to see. It almost seems that only blue and red are...

Tv have halo pictures and dulls colors?Yes,the tv have bad Coolant chemicals on those colors guns R,G,B CRTS tv Tubes.Must replaced those CRTS Coolant chemicals on those CRTS tv tubes.Tries websites like, to buy a Coolant kit to replaced those CRTS tv Tubes coolant chemicals.

Nov 13, 2010 | Philips 55PW9363 55" Rear Projection...

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Sony 1292 - the red tube seems to always run at full output. There is a most distinct red cast to everything. When the projector is idling, with no input present, the blue and green tubes barely glow,...

remove front bottom panel and turn RED screen drive down it will be on your Focus/screen drve control block 3 controls on top for focus R/G/B and 3 below for screen drive to tubes R/G/B

Dec 07, 2009 | Projection Televisions

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Faint lines show up when i get dark screens in movies

First check what color of faint lines comes then reduce Screen Volts in TV of that CRT (tube)
Take off lower front cover, speaker grille of TV, there you will see focus control block that has 6 control knobs, upper 3 knobs are focus adjustment of red-green-blue CRTs and lower 3 knobs are screen volt controls for red-green-blue CRTs. Turn screen volt control knob CCW to reduce screen volts of desired CRT.
Put TV on any free AV input so screen will be dark enough to adjust screen volts.

Aug 28, 2009 | Sony KP-57WS500 57" Rear Projection...

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Need help on how to replace CRTs on RPTV

You can get replacement CRts which come with step by step instructions on how to do the installation

May 22, 2009 | Projection Televisions

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Colors off. blue and yellow not lined up

try to set the convergance if you cant you can adjust the color tubes from inside the tv but have to be very careful to do this. There is actually only 3 colors in the tv red, blue green so I would say your blue and green need lined up

Sep 30, 2008 | Projection Televisions

1 Answer

Sony Rear Projection TV - Red tube too strong

remove the front speaker assembly and the small access panel behind it and you will see a small square control assembly with 6 dials on it 3 control the color guns and 3 control the 3 gun focus. Try turning down the red control slightly they will be set up just like the CRTs red green and blue.

May 16, 2008 | Sony KP-57WS500 57" 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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Sony kp51hw40

did you adjust the green screen control .

Oct 01, 2007 | Sony KP-51HW40 51" Rear Projection...

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