Question about Toshiba TE55T11 55" Rear Projection Television

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Picture doesn't work

The picture went out suddenly, is it possible to replace the picture tube myself(or whatever part it may be)?

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Maybe...check the power supply as well. Those tend to go bad. A projection TV has more than one tube, and replacing them can be more expensive than replacing the whole television set.

Posted on Nov 27, 2013


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1 Answer

Have sound, but no picture

You do not need a "picture tube" whatever you may mean by this.

Here's what you need:

(sorry, no point in copying it, so referring to it instead):

Feb 16, 2013 | HP PL4260N 42 in. Plasma HDTV

1 Answer

TV Screen went green, LG 21" CRT TV

The expert addressed no longer seems to be posting answers on this site.

I would suspect the trouble is one of two things---a shorted device like an IC on the board at the end of the picture tube---most sets use either 3 transistors, one larger IC or 3 individual chips---first thing is to examine the soldering on that board looking for any broken connections.

If you can find a schematic for the set voltage checks will pinpoint where the issue is---an old trick if uses 3 transistors or 3 chips is to identify which is green and swap it for one of the other 2 if numbers on them are identical.

Second and fatal possible reason is the green gun in the CRT picture tube is shorted---almost no way around that as the tube itself would have to be replaced---most modern shops are able to test the tube and determine if shorted or not.


May 03, 2012 | Televison & Video

1 Answer

I have a Samsung CT5038VC CRT TV, it was showing very well , then suddenly, the entire screen went green! you can still see, but everything is green. Please assist me in finding the solution to this...


Since picture is there, sound also mut be. The screen colour went green is your complaint. It is due to the video output stage of your TV. The fault mainly occur in the picture tube base board card. Loose or bad solderings ara always noted. There are three video output trnsistors there in the base board In some models of Samsung sets, either three individual Ics or one single Ic is used. Anyway the fault lies around this card.
You jsut open your TV, pull out the base card from the picture tube neck, care must be taken when you do, not to shake sideways or up down. Just pull it straight back, otherwise picture tube base pins or picture tube neck wiil get damaged. Before doing this check the vlotages of the three cathode pins of picture tube base. It can be done withoug detaching it out from the neck. There are three cathodes. Blue, Green and Red. In most Tvs these voltage will come near to 130 vdc or so. In your TVs case, now the green cathode voltage will be low with respect to the other two cathodes.
This may be due to a loose soldering or fault related to green cathode itsef. If transistors are used, check the green output transistors collector voltage,and compare it with the other two voltages. If Ics are used, do the same. If one Ic is used the checkings are the same.
Just resolder all the loose suspected points before replacing anything first. If it does't help, you just desolder out the green bias drive, whether it is a transitor, or Ic, whatever may be. If it is transitor, just plug it to the picturetube and switch it on without the green drive. Now you must see a different colour, a mingle of red and blue, a type of cyan. If so you can make sure that green output, whatever type it may be, is faulty. Just replace it with same type and number. Check the 2W resistors, if any used, for open, especially to the green drive transistor load resistor. Ok.

Nov 13, 2010 | Samsung Televison & Video

1 Answer

Picture dark...can barely make out people hitachi 57gwxz20b

Did this happen suddenly, or has the picture been dimming gradually?

If it was a sudden onset, I would first suspect the high voltage terminal/focus divider block. The focus divider in many sets also produces the "screen" voltage, which has an effect on the brightness of the picture. Often focus dividers will crack when they fail, so you may be able to spot a problem with this part by visual inspection. Other possibilities include an incorrect (failing) supply voltage to the picture tube boards (G1, G2, or driver transistor power).

Gradual dimming (other than problems with degrading components in the power supply):
Do you have a smoker in the house? The tar in tobacco smoke is attracted to the high voltage on picture tubes. You may need to clean off all of the optical components. I have found that window cleaner sprayed on a soft paper towel works for this. Do not spray the cleaner inside the set, and don't make the towel dripping wet with the cleaner! You risk serious damage to the electronics if you do. Avoid scrubbing - you don't want to scratch anything or push it out of alignment. Just keep wiping gently and let the window cleaner do its work. If tar buildup is the problem and it is as far gone as you describe, you will probably use up quite a few towels and a sizable fraction of the window cleaner bottle before all three picture tubes are clean. Don't do more than dust off the sides of the tubes - it's the face that needs cleaning, and window cleaner is bad news

Another possibility is broken-down CRT cooling fluid. (This is low probability - you would probably have noticed the colors going to an ugly yellowish brown long before it went dim.) When you look at the top of the three picture tubes, you should be able to see that they are red, green or blue. If the colors are quite dark, dull or muddy-looking, the CRT coolant has gone bad. It is possible to change it, but be warned that you must not let any drip into the electronics. Broken-down coolant can conduct high-voltage electricity, and the results are disastrous - I've seen a power supply board ruined by the stuff.

Oct 01, 2010 | Hitachi 57GWX20B 57" Rear Projection...

1 Answer

My sony vega is only 4 yrs. old and it went black all of a sudden while we watching it and the lamp light came on

It is possible that your picture tube went out, therefore you would have to either buy a new picture tube and have it installed in the TV or replace the TV altogether. I suggest that you consult the manual that came with the TV. It might be able to help you better. Good luck to you!

Jul 29, 2009 | Sony Televison & Video

1 Answer

Picture suddenly turned dark

hi the picture tube of ur tv has got damaged and it badly needs a replacement.. so its better to replace ur picture tube..

thank u rate me!!

Feb 08, 2009 | Sony FD Trinitron WEGA KV-24FS120 24" TV

1 Answer


replacement of a picture tube in a itc222 chasis is one of my least favorote things to do here at the shop. average cost for a tube is around 250... replaceing the tube takes some time and the set has to be completely disasmbled. then reassemble and adjusted. i believe union electronics offer these tubes. you have to get the tube type of the tube itself there are several tube +lens combinations that have to be considered. willie at

May 12, 2008 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Picture and sound went out suddenly on a Sony KV-35S40

sony has problem with bad picture tubes as well as flyback transformers .if you have shorted hori output then replace it if set shorts it out again your looking at bad flyback transformer as well as maybe leaky tube.

Oct 27, 2007 | Sony KV-35S40 TV

1 Answer

Picture suddenly went dark

Hi, Apparently you have a possible component failure with your Panasonic PVQ-2510. This would involve the circuitry at the back/neck of the picture tube. Diagnosis would require familiarity with discreet components, use of a VOM, soldering and general component knowledge. In as much as it is possible that your red drive transistor (or an IC) would require replacement or resoldering, your best bet is to seek the services of a qualified professional. Should you venture to do a do-it-yourself, pls post back. Good luck and kind regards.

Oct 02, 2007 | Panasonic PVQ-2510 25 in. Combo

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