Question about Hitachi 65TWX20B 65" Rear Projection Television

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The top of the screen is yellow color then drops down in a swoop and more yellow and blue. otherwise picture is good, pushed the magic focus but it did no good. thanks for any help

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  • Hitachi Master
  • 8,457 Answers

The magic focus button don't work.The tv have a problems known as a convergence problems,it dead.The tv colors lines R,G,B mis alignment,have colors shadows or 3D pictures.The tv convergence board the 2 STK convergence ICS and some or all it resistors are dead.These parts,must be replaced on the tv convergence board to solved the tv convergence picture problems.The shop,will cost u $300-350 for parts and labors.

Posted on Oct 15, 2010

  • whitetobydog Oct 15, 2010

    will it damage the tv if I watch it as is? or should it be turned off until repaired?

  • Chi Chu Oct 15, 2010

    Yes.Don't turn on the tv anymore,until it fixed.Tv have problem,if tv have problems,u continue to use it,will burn somethings else on the tv,will cost u more money.

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Suddenly color out of whack and words shadow each other in another color. I went to Magic focus manual and the yellow and blue lines are distorted (don't line up together), particularly on the top and...


You have a convergence problem. If you are handy, you may be able to repair this. The signal module will need reworked. The best repair for you, or some one you know, who is an electronic servicer can get help. Please see the website www.TvRepairKits.com. You will find the best repair kit. I have used this website to repair a few of the Hitachi Projection TVs. The instructions, and parts,, along with photos, will be very, very helpful. Have your TV model number close by, as you search this website. Thanks for asking and show a few hands of support!

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If you have yellow coloring on everything, this is not a lens alignment problem. Either you have a color balance problem (weak blue) or the coolant fluid in one or more CRTs is going bad. The coolant liquid is supposed be clear, but with age it breaks down and turns yellow.

First, unplug the set and remove the back. Use a mirror if you have to, but look down at the top of each CRT using a bright light. They should be colored red, green or blue, with no yellow to muddy the color. That's a quick check on the coolant condition.

You can replace the coolant, but be very careful not to spill any inside the set. Broken-down coolant can short out electronics and cause a lot of damage to the circuitry, especially in the high-voltage sections. Some people prefer to remove the CRTs from the set for this process, but that is a considerable amount of work. Others use kits with pumps to remove the coolant, and work inside the set with reasonable precautions - if there is enough room. There are a number of good tutorials on-line, or at least there were when I last looked two years ago.

I recommend getting the color right before attempting the focus. Bad coolant may scatter the light and fuzz up the picture, so check that out first and post back what you find.

If you have yellow fringes on otherwise normal colored objects, the blue convergence is off. This will also make lettering appear out of focus. Most RPTVs have a procedure for bringing up a convergence pattern (a grid of dots) using the remote control. The dots should all be white or have very little color fringing. Follow the directions, and make small adjustments, then check the effects all around the picture. Correcting one section may cause a change elsewhere. Use a ruler to make sure the dots stay in the right place; otherwise you may end up with a distorted picture.

Caution to other readers: do not try to adjust convergence if you have a "bow-tie" shaped picture in one or more colors. This indicates a convergence amplifier failure, which must be fixed first.

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1 Answer

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Hi,
Sounds like you have a bad convergence circuit, it's what lines up your picture so the colors are correct. Most brands (excluding RCA) use the same basic design. There are 2 big ICs called STKs that normally fail, some resistors or fuses may also go. Its about $300-$400 bucks to have someone repair it. If you want to try it yourself, this link TVrepair will take you to a site that sells kits with the parts and step by step instructions on how to fix it. Good luck

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1 Answer

Near the top of the tv the objects are double exposed with in blue and yellow color.At the top of the tv in a light color you can see a faint color of yellow and blue that sort of swoops down like a...


Hi,it seems you are experimenting a light engine problem.This is how your tv works: http://www.youtube.com/watch?v=ZLLHnQ4y-wo So basically the 3 Lcd chips that create the colors and image is going bad and thats why you get that color discoloration.Contact Hitachi or look for your light engine online.God bless you and your house!

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There are integrated ic's that control the convergence circuit, it generally requires qualified service personnel to repair this.

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1 Answer

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lupe0112,

I'm no expert, but I think that you have a problem with the convergence of the 3 color guns. I've been working on a similar problem. As a first step, have you tried "Magic Focus?" The Magic Focus button for the Hitachi 53UDX10B is at the left of the small front panel controls that also include your RCA composite and SVideo connectors. Let the set warm up for about 20 minutes (as recommended by the user guide), and then press the Magic Focus button. When you press the Magic focus button, the set will auto align the 3 color guns. If this doesn't fix your problem, unplug the TV for at least 4 hours and try again.

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Good Day,

Sounds like the TV's convergence circuit has failed:
*Call an Authorized Service Center and them give you an estimate cost of the repair, or
*Repair it your self; get KIT 10 locally or B&D Enterprises
1-800-458-6053; www.bdent.com.
Good luck, big IRISH.

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Blue convergence IC bad...have both IC's changed..insist on
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1 Answer

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