Question about Toshiba 46H84 46" Rear Projection HDTV-Ready Television

1 Answer

Blue crt assmbly maybe?

I have a toshiba 46h84 rear projection screen tv, after I have it on for about 10 minutes the screen turns bright blue then it shuts off and then the power light starts flashing...and it wont do anything until i unplug the unit and turn it back on and then the same thing happens.

Posted by on

  • 3 more comments 
  • antoniov1 Apr 02, 2008

    yes the screen did start showing a bright blue light before it shutdown again, and then the screen turned blue also

  • Anonymous Apr 05, 2008

    I am having the exact same problem, I'm going to try the soulution posted and will get back.

  • smanninger Apr 14, 2008

    great advice!!!!!!!!!!!! now does anyone know where I can order one without going to a dealer??????

  • ktrach May 22, 2008

    I have the same problem but it's with the green crt. The screen will turn bright green then the TV will go into safe mode and the power light will start flashing. Sometimes I can unplug the TV, plug it back in and turn it on and it will work for a while. I bought a remote control electrical plug from Radio Shack for about $25 and plugged the TV into it so I won't have to crawl around on the floor to remove power from the TV. Sometimes it gets so bad that the TV won't come back on. When that happens, I remove the speaker panel so I can access the color adjustments. There are 2 (side by side) for each crt. They are Red, Green, and Blue from top to bottom. The adjustments on the left are for focus, the one's on the right are for intensity. If I unplug the TV and turn my intensity all the way up on the green crt, plug TV in and turn in on, my TV will remain on. I adjust the green intensity back to where it looks good and every thing OK for a while. I have been doing this for about a month and things don't seem to be getting worse, although I do have a spot in the middle of the screen that seems to be growing, so the green crt does need to be replaced. The crt's are so expensive I don't know if it's worth repairing, even if I do it myself. This seems to be a common problem. I would hate to have all 3 go out in the near future and have to spend as much on repairs as it cost to buy a new TV. I hope this helps someone. I don't have a technical reason for this working nor do I know if it won't eventually do more harm than good. For me, it's a nothing from nothing situation!

  • Juudjr May 11, 2010

    When screen turns bright blre. Do you also see brighter thin lines that are curved approx. 6 inches apart. And is the picture so blue you can no longer see the video through the color?



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Toshiba Master
  • 8,617 Answers

Its very possible that the blue CRT is horting the set out. Heres how you can test it. Remove the speaker grille and access panel behind the grille and you will see the crts. remove the blue crt circuit board from the end of the blue crt and make sure it isnt touching anything then try powering up the set if it doesnt shut down then you have found the problem and you will need a new crt. or you can switch the blue circuit with the green and try it iwth the blue on green and the green on the blue then if the screen turns green before shutting down you will know that its a problem in the blue drive circuit and not the crt. lety me know if you need further assistance.

Posted on Apr 01, 2008

  • Sonny Berry
    Sonny Berry Apr 02, 2008

    If you switched the crt circuit boards like i suggested and the screen still turned blue its definitely your blue CRT that needs to be replaced.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Technician (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How to replace procector lamp in model 46h84 toshiba

Projection TV sets have three tubes - red - blue - green and they don't fail often...they are located inside the tv DLP TV sets use a single bulb and a clot wheel to make the three colors display...DLP bulbs do fail about every two years and will need o be replaced. Replacements can be found at and its located behind a small door on the rear of the tv.

May 19, 2013 | Toshiba 46H84 46" Rear Projection...

1 Answer

My tv is fuzzy for about 10 minutes when first turned on then the picture is ok what is going bad

You either have poor solder connection around FBT flyback transfomer resolder all the pinns on it and any other poor looking solder joints. or your focus/screen control block maybe going Bad.

Nov 30, 2009 | Toshiba 46H84 46" Rear Projection...

1 Answer

Sirs: We were just changing channels and the

THE projection bulb is blown if no sound tv probably broken

Jul 31, 2009 | Toshiba 46H84 46" Rear Projection...

1 Answer

Blue screen

you are not getting a signal which means there is a problem with the tuner not working.

Dec 25, 2008 | Toshiba 46H84 46" Rear Projection...

2 Answers

Toshiba 46H84 Blue CRT Misaligned

The problem is you convergence IC's. STK392-110. If you are not experienced I would contact a tech to do this work. Repair costs should be 200-400 depending where you live.

Dec 08, 2008 | Toshiba 46H84 46" Rear Projection...

1 Answer

Toshiba 46h84 rear projection shutting down

I have a Toshiba 46h84 with similar problem that needs a new green crt. Mine does not have a cooling fan. I don't know if having a cooling fan would help the problem, but mine didn't come with one. There are rear projection TV's that have bulbs in them that require a fan. This particular model uses a red, a green, and a blue crt to generate the picture and probably doesn't need one.

May 19, 2008 | Toshiba 46H84 46" Rear Projection...

1 Answer

Toshiba 46H84 46 in

the tube will be around 400.00 and then the repair tech will want maybe 150 to install. Try this link they may be able to get you one some what cheaper and give free tech support so you could install it yourself.

Apr 29, 2008 | Toshiba 46H84 46" Rear Projection...

1 Answer

SCreen turns red then shuts off

The 46H84 has 3 CRTs instead of a lamp. Red, Green and Blue. Your red CRT is shorting out shutting down the set.Here is how you test that theory. Remove the speaker grille, there will be an access panel behind the grille remove that and you will see the CRTs red is usually on the left. hit the power momentarally to locate which tube is red. then power down and unplug the power cord. Carefully remove the tubes Circuit board. ( you may have to carefully slice the glob of silicone applied at the factory to get the circuit board off) Once you have the circuit board off the Red CRT make sure it isnt touching anything and try powering up the set. If the set stays on and the other 2 CRTs light up. That tells you the RED crt is shorted and thats whats shutting your set down. Let me know if I can assist you further.

Mar 25, 2008 | Toshiba 46H84 46" Rear Projection...

Not finding what you are looking for?
Toshiba 46H84 46" Rear Projection HDTV-Ready Television Logo

210 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toshiba Televison & Video Experts

The Knight
The Knight

Level 3 Expert

74844 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Jaime Hernandez

Level 3 Expert

2326 Answers

Are you a Toshiba Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides