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

8 Answers

Toshiba 46H84 LCD TV has maroon color verticle lines

Toshiba 46H84 LCD TV has large verticle wavy lines on the screen when cold and as it warms up they get smaller but the screen still has a redish tint to it with smaller lines. I have already replaced a PD1731-A convergence board but it didn't help. I have pictures that I can email

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  • 3 more comments 
  • sasman570 Feb 11, 2009

    I had it unplugged while I replaced the
    PD1731-A1 board so it should have already reset.

  • sasman570 Feb 12, 2009

    I understand the $700.00 get a new TV answer I got that one from the Sears Guy. I can replace or fix anything in that TV. What I want to know is after the convergence board relacement mentioned above what would be the next step. I can easily get the board and install it I just need to know what board. I hate to take the ax to this if there is any hope.

  • sasman570 Feb 12, 2009

    can send email of screen pictures if required

  • sasman570 Feb 17, 2009

    Took mothreboard out and looked it over with a magnifying glass. There did not seem to be any soder problems I remelted anything that looked suspicious. Checked all plugins and put it back together. I does the exact same thing. It has a red tint to the screen with zigzag verticle lines. The picture gets better after several hours but still has lines.

  • sasman570 Feb 17, 2009

    No just replaced the whole board

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8 Answers

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Hi and welcome to FixYa,

Offhand, two major sections that you may want to consider/check:

  • if the problem is consistently present on multiple signal inputs such as tuner, HDMI, composite, component, then you may want to check the power supply board P/N 23762135. Of particular interest would be the DC to DC converter, cold solder on the pins of the high frequency transformers, filter capacitors and diodes;
  • if the problem is only when HDMI is used as signal input, then check/replace the HDMI board with newer version P/N 23148055X.
Additionally, you may want to reference repair documentation for this model:

Good luck and thank you for using FixYa.

Posted on Mar 09, 2009

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You have 3 color projectors.Sounds like you have lost one of your color power modules.When I had mine fixed it was $250.00.

Posted on Feb 17, 2009

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This is not a convergence issue - You have a condition called Vertical Banding.



The problem may be present on any or all of the three panels that provide the red, green, and blue subimages. Sometimes it is one bright line then three dim lines, sometimes it is five bright lines and then three dim lines, usually repeating in twosome, foursome, eightsome etc. groupings.

Vertical banding is usually used to describe specifically the vertical banding issues on LCD displays. It's caused by a difficulty in controlling the vertically controlled arrays of LCD pixels and keeping them all at the same voltages, etc. IT will vary from display to display, and is usually most visible on green, which causes itself to be seen on smooth images especially skies and the like.

Posted on Feb 12, 2009

  • 2 more comments 
  • blueextc3221
    blueextc3221 Feb 12, 2009




    Sorry - hit the post button before i was finished!!




    Note that these will be vertical kinds of faint stripes in the image across the screen. OTher banding/contouring problems can appear on any display and in other directions because of bit-depth problems. Many LCDs have other contouring/banding problems besides VB.


    If you are using Component video cables - time for a test...



    Disconnect the blue cable and see if the wavy lines go away. Next, reconnect blue then disconnect red. Then, reconnect red and disconnect green.

    This might help isolate the funky component connection; red, green or blue.
    If the wavy lines continue during the tests then you can assume that the entire component card is suspect.

    It might be as simple as a poor solder joint. These tests might help you isolate the problem.




  • blueextc3221
    blueextc3221 Feb 12, 2009

    Sometimes the "fix" can be as easy as testin in another wall socket in a different room. This wavy line condition can be caused by a noisy electrical feed from a wall outlet. Lowering or raising the refresh rate would be the fix in that situation.

  • blueextc3221
    blueextc3221 Feb 12, 2009

    The only way to correct the Vertical banding is to adjust the Pixel Clock.

    Some general adjustments may be made in the user menu under refresh rate - but a fine tuning to eliminate the lines must be done with specialized equipment.



    Your best option is to seek a qualified LCD Tech that has the equipment to make this adjustment. While in there, he can check the main board for cracked solder joints.



    Expect to spend about $250 to service your TV. A substantial investment - but less than the replacement cost.



    Good Luck.



    Thanks for using FixYa - a FixYa rating is appreciated!!

  • blueextc3221
    blueextc3221 Feb 17, 2009

    Usually when a red Crt goes bad it will turn the screen red with retrace lines or shut the set down. So chances are its in the Red Crt pcb instead of the convergence board.

    Most likely its the red drive transistor on the Red CRT pcb which is defective, or it could be as simple as a solder joint issue on the Red CRT pcb.

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FIrst of all the problem is not a convergence problem. LCDs don't work that way. Second, since the set seems to recover over time, it suggests a connection problem that a little bit of heat will resolve. If you can solder and the unit is no longer under warranty, you can look for poor solder joints and reseat all of the connectors and cables. Sicne the signal levels internally are so small, it takes littel to create a noticable problem. Look for solder joints that are grainy in appearance and resolder them. Please update this with your results.

Thanks,
Dan

Posted on Feb 12, 2009

  • ABRsvcs Feb 12, 2009

    OK. I did a littel nmore research on this and the model number you listed is in fact a CRT based set. The same issue applies though. Check all solder connections and cable connections. One other thing to check is the board at the neck of each tube. These contain the driver transistors for the individual tube. Poor connections at these transistors can exhibit this behavior as well.



    Keep us posted.

    Dan

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Re: "Toshiba 46H84 LCD TV has large verticle wavy lines".

Convergence circuit (this is all digital) should have been tested before replacing.

This TV has both LCD and LPD technology working together, and the problem on this kind of set is not necessarily convergence.

A fault concerning the LCD cable/connector, or the digital control on the main board can cause the same problem.

You should get a service manual for this model and follow troubleshooting diagrams to fix the problem.

Posted on Feb 12, 2009

  • Ginko
    Ginko Feb 12, 2009

    After working on convergence, that probably was fine, you need to follow the troubleshooting diagrams on service manual, to test digital video on digital board.
    Your TV chassis is n4psp, therefore buy a service manual for this chassis.

    You can buy here:
    Toshiba TV Television Service N4PSP

    or download here for $3

    or buy here with free subscription:
    Members Download Link to the Toshiba 52HM94 Service Manual

    Altenatively you can order service manual from Toshiba for $25.

    Give me feedback on your problem.

    Thanks.



  • Ginko
    Ginko Feb 17, 2009

    After replacing the convergence board, that should have been tested before replacing, you need to test and replace the rest of the component that can cause this problem.

    To do that you need the service manual, as you cannot keep replacing parts that you are not testing, that is a waste of money.

    Buy a service manual here .

    You also find service manual and all parts for your TV here: 46H84.


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Hair line cracks in motherbord on soldering jobs look all over re soilder them back togther nicely

Posted on Feb 11, 2009

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Hi
hard reset - Just unplug the power cord leave the unit disconnected for 30 minutes and plug the power chord to the unit and it resets the unit ......

Posted on Feb 11, 2009

  • gopinath pasupathy Feb 11, 2009

    have you replaced resistors and capacitors while replacing the board.......

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  • Toshiba Master
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You have what is called a convergence problem, the parts to fix it are about $200 and that will no include labor, the final bill will be about $600, my suggestion is just replace the TV.

Posted on Feb 11, 2009

  • yadayada
    yadayada Feb 17, 2009

    give it up and buy a new LCD TV, had same issue through 100's away trying to get it fixed.

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Vertical lines when I turn on my Toshiba 51HX84


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Projection TV sets have two very common problems listed below.

Problem #1) Convergence


These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

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Picture all distorted cold warms up ok


Projection sets have two very common problems.

The first common problem is convergence


These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

bb0cf99.pngYou can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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Vertical lines


hair line cracks in motherbord on soldering jobs look all over re soilde rthem back togther nicely

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