Question about Toshiba 42H83 42" Rear Projection HDTV-Ready Television

3 Answers

DARK PICTURE PICTURE VERY DARK . HAVE CHECKED HIGH VOLTAGE CHECKS OK 31KV

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  • xrserv Aug 03, 2008

    have restarted many times not an answer.
    need more help

  • xrserv Aug 03, 2008

    thanks for nothing

  • xrserv Aug 09, 2008

    latest solution turns out to be for a plasma tv the 42H83 is CRTs driven .

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3 Answers

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Is it dark as well when you watch dvds? Have you tried adjusting the brightness on the TV Menu/Settings?

Posted on Aug 03, 2008

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It could be this one:

Symptom:

Green flashing in the picture and/or dark picture. (Note: Multiple symptoms
could be exhibited with this problem)

Corrective Action:

for troubleshooting guid please click on this link to get the Toshiba TV Technical Bulletin

(Go to Page 3)

there are figure, pictures and steps that will need to be followed to get the TV back in great shape

Hope this helps, good luck

Posted on Aug 03, 2008

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  • 310 Answers

Just restart the tv and can u tell me company name and model no.........

Posted on Aug 03, 2008

  • khader ibrahim Aug 03, 2008

    Model no pls...........



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1 Answer

Picture flickers every few minutes


There are several possibilities. This model is based on CRT (picture tube) technology, and has a high voltage circuit. This circuit consists of three heavy wires, one from the side of each picture tube (red, green and blue) going to a single connection block. There is another heavy wire from this to the high voltage transformer on one of the circuit boards.

First, unplug the set, and wait 20 minutes to make sure everything is cool and residual high voltage charge has drained away. Check the wires at the connection block to make sure they are not loose. There is usually some sort of retainer clip to lock the wires in place, make sure these are not broken or unlatched (sometimes they get brittle with heat and aging). Frequently these are covered with a thick layer of dust held on by electrostatic attraction; gently vacuum this off. If all looks good, plug in the set, and wait until it's dark outside. Turn on the set with the room lights off, and look at the high voltage parts. If you see a blue corona glow or sparking, that part has an insulation breakdown problem or a bad connection. It is normal to see an orange glow at the bottom of each picture tube, and you would also see the three colors of the picture coming out of the tops of the picture tube. WARNING: do not touch the interior of the set while it is on, especially not in the dark.

Another probable cause is a cracked solder connection on the power/deflection board (the one with the high voltage transformer on it). If the flickering is one color rather than white or a momentary darkening, the problem is in one picture tube circuit (yellow -> blue dropout; ->cyan -> red dropout; magenta -> green dropout). The picture tube circuit includes not only the high voltage (second anode) section, but also the picture tube drive connection on the base of the tube all the way back to the video processor and switching circuits.

Apr 04, 2015 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Signal Problem


Hi,

When the sound is working and the picture is not it indicates the main power supplies are working but the picture supply is not. The picture supply that powers the projection tubes is a high voltage generator and is very expensive to repair. Not even most tv techs now how to troubleshoot them. So, I cannot recommend you repair it yourself unless you are a trained high voltage tech.

The cost of repair - my wild guess - would be around $300. However, the real cost can only be determined by someone who can make an accurate diagnosis - which will require a hands-on approach the problem.

If you have any other problem please ask me..
Goodluck,
Please don't forget to rate me as fixya..

Feb 09, 2008 | Projection Televisions

1 Answer

Problem with rca big sreen tv


First, try a hard reset.
You must unplug the power cord (turning off the set or the strip will not do it) for a couple of hours, then try again.
This will sometimes correct the problem
When it blinks off: Does the raster go dark or just the picture and the raster remain?
If the raster goes dark when it blinks off it means there is a loss of high voltage to the picture tube. High voltage repair is expensive. It may be a failing flyback transformer that is functional inside the horizontal deflection circuits.
If the raster stays on and you just lose video (picture information) then it may be a simple intermittent IC chip in the video board area. It may require a technician to determine which IC and how to replace it or the parts associated with it, but probably not terribly expensive to repair.

Jan 12, 2008 | Projection Televisions

1 Answer

Toshiba 50A61 have sound but no picture - all fuses check okay


Not too many--if sound is developed from the set and not a surround system the set will blank the 3 picture tubes for a few reasons:

Voltages missing at the tubes (high voltage or screen voltages etc)

There is a loss of vertical sweep or horizontal sweep--set will do here this to prevent an INSTANT burn mark on all 3 tubes.

One thing you can try to look for is to see if the filament in each tube is lit---rather dim as 6.3 volt one---if lit the above reasons are your problem.

Without a meter, a schematic etc not much more you can check.

You should hear a faint whoosh sound when you power the set on--the high voltage coming up.

Jun 07, 2012 | Toshiba 50A61 50" Rear Projection...

1 Answer

Sound and no picture


Set was actually made by Samsung who owns and uses that name.

Rear projection with three picture tubes.

Problem could be in the high voltage area and likely is.

Only other area that could cause this is the main board.

In either case someone needs to open set and do some checks.

Apr 04, 2012 | Akai PT4250A 42" HDTV

1 Answer

My poor mitsubishi 55908 just lost it's picture after working flawlessly for 10 years. The sound is still there, but the screen just went dark. Is this something that is repairable? Thanks!


hi,
This is a high voltage problem, but first try turning up the screen voltage located on the focus block. This requires opening the back of the TV, be careful of dangerous high voltage. See if there's a picture after turning up the red, green, blue, voltage adjustments, if not then vertical sweep, Flyback, or convergence need servicing. This repair shouldn't cost more than $300.00 dollars, maybe less. Contact me at my link below so I can help you further. If this helps please rate :-)
Thanks..
http://tvtechwork.webs.com/

Oct 22, 2010 | Mitsubishi WS-55908 55" Rear Projection...

1 Answer

Thin red arched lines, when screen is dark.


common problem with sony, focus and picture level need to be adjusted, should be done by a tech. (high voltage) in focus block.

Nov 24, 2009 | Sony KP-57WS500 57" Rear Projection...

1 Answer

Hi, Folks... I have 1994 Sony Trinitron KV-32V15 with this symptom: Turn it on for few minutes, picture showing ok, then collapses to dark brownish backgroud with screen full of horizontal lines...


It sounds like your high voltage transformer is shot and now time to purchase a new one. The cost of repair is too high for the type of tv you own.Sorry for the bad news.

Feb 10, 2008 | Projection Televisions

1 Answer

Very Dark Picture


This sounds like a typical problem in the sweep power supply.. theres a filter capacitor for the CRT screen voltages that is most likly open or changed value. the first clue is that you get all your colors on the convergence. this is a high voltage circuit and should not be messed with by the user unless they have solid state repair exoperience and know all the high voltage saftey factors involved. Please call in a trained tech to assist you in this matter. Good Luck

Oct 08, 2006 | Toshiba 42H83 42" Rear Projection...

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