Question about Toshiba 42H81 42" Rear Projection Television

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Toshiba 42 this televivion set powers up with proper sound. However, the picture seems to roll. There are lots of horizontal scanning lines on the sceen but everything is blurry(the colour look like they are not properly mixed). i was adviced that the two big STK ICs could be faulty or the hyper module needs servicing. where do i go from here?

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Re: toshiba 42


Posted on Jan 22, 2008

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Sound no picture 56h80 toshiba

This set will blank the picture for several different reasons:

No filament voltage to the three tubes it uses.

No high voltage to the three tubes it uses.

No vertical or horizontal sweep (prevents all three tubes from having the screens burnt with a line.

Some of these can be tested but most require a schematic etc.

Set has several fuses and some do not look like fuses--called pico fuses.

Jun 11, 2012 | Toshiba Projection Televisions

1 Answer

My toshiba 42h83 tv has sound but no picture

of course check different inputs etc to make sure something did not get disconnected.

This rear projection set uses 3 picture tubes and the set will protect them if there is a problem in the vertical or horizontal sweep circuits that might burn the screens or the damage the tubes.

No simple answer as a lot of different parts are possible for this problem.

Apr 27, 2012 | Toshiba 42H83 42" Rear Projection...

2 Answers

My picture is doubled on my toshiba TN50V71 as if there is a shadow behind everything? Please help!

hi, sounds like a convergence issue. try this...
  • Look through your manual. Your manual will always give you the most specific directions for your particular model. Look for an "adjusting convergence" or "set manual convergence" section.

  • Enter the menu on your TV. Use the remote control and bring up the menu.
  • Choose "Convergence." This may be under "Picture Settings," "Function" or "Advanced Options."
  • Select a color. You will have red, green and blue to choose from. Do each one, starting with red.
  • Press "Enter." A crosshair pattern will appear on your screen.
  • Adjust vertically. If there is a horizontal red line visible, press the up or down arrow keys (or channel up or down) to adjust the convergence until the line is superimposed on the horizontal-center line of the white crosshair.
  • Adjust horizontally. If there is a vertical red line visible, press left or right (or volume up or down) to adjust horizontally. Do this until the line is superimposed on the vertical line of the white crosshair.
  • Save settings. It is important to save your settings when you are done, instead of simply exiting the menu.
  • Repeat these steps for all colors.
    good luck!
  • Feb 02, 2011 | Toshiba TN50V71 50" Rear Projection...

    1 Answer

    My toshiba rear projection TV's picture just went black. Sound is good just a black screen.

    high voltage is not coming up. possible fuse locates on power supply board on the right if you are sitting behind set with back off. if fuses are good, possible horizontal output transistor shorted. sounds horrible but easy repair

    Nov 10, 2009 | Toshiba 42H82 42" Rear Projection...

    1 Answer

    I have a toshiba big screen with three bulbs and the picture has wavey lines on the screen. Does this mean tubes are going out?

    Most of these Toshiba sets have a "hyper board" that processes all the signal and a lot of them are going bad---lots of surface mounted filter caps on the board dry out and usually it begins that lines in the picture and after several minutes the problem slowly clears up and or goes away---as time goes on it takes longer and longer for it to go away----For most of these sets the only way to repair is remove the board and send it out for rebuild--rebuild of the board and labor may be more then the TV set is worth.

    Jul 10, 2009 | Toshiba 42H83 42" Rear Projection...

    1 Answer

    Mitsubishi TV had horizontal lines across the screen and rolls up

    ONE: Yes, the speaker mounted close/near to the set can be a cause of mischief; please move it further away and see if that helps clear up the problem. But, you must keep it away for several days before you will know for sure because it takes some time to degauss all the internal parts that may have become corrupted by the magnets in the speaker.

    TWO: Yes, any set can be repaired the question is cost and wisdom. Old sets are sometimes not worthy of the repair simply because of the likelyhood that another failure will follow soon after. A big screen always invokes a repair charge of $200 and up. After a few of these you will wish you had put all the money into a new set!

    THREE: The lines are most likely a problem in the vertical blanking circuits of the set. These are horizontal retrace lines that are supposed to be blanked out during vertical retrace of the raster. Think of it as a paintbrush that scans across the screen painting thin lines and when you get to the bottom of the screen it goes quickly back to the top, but during that time the horizontal, which is many times faster, has made several sweeps; so it must be blanked out during the retrace. The repair involves finding the guilty parts and replacing them. Usually this repair runs over the $200 somewhat.

    FOUR: Prior to calling in a service tech try a hard reset to see if that will recover any of the circuit degradations. Merely unplug the power cord and leave unplugged for 4 hours or more. It may help. Or, it may not help; but worth a try since is won't cost you anything.

    If the set is over 5 or 6 years of age it probably is not a condidate for any expensive repair. On the other hand, it is a Toshiba - and they make a fine set.

    Hope this helps. Let me know if you have further thoughts.

    May 09, 2009 | Mitsubishi WS-55511 55" Rear Projection...

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    Toshiba 42 WH36 P REAR PROJECTION

    You have a convergence problem. Need to replace convergence IC's.

    Jun 02, 2008 | Toshiba 42H81 42" Rear Projection...

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    White horizontal lines on screen

    Replace all electrolitic capacitors on the Proscan pcb.

    Dec 11, 2007 | Projection Televisions

    1 Answer

    Picture on 42HDX82 vertically stretchs after about 10 mins

    Sounds like a bad cap, spray some freeze around till you can duplicate the problem.

    Oct 22, 2007 | Toshiba 42HDX82 42" Rear Projection...

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