Question about Hitachi 50UX26B/27K 50" Rear Projection Television

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50" Hitachi rear projection TV problem twisty lines

My TV has all 3 colors but the bands of colors are twisted together horizontally in bands across the middle of the screen and about 3" high, no normal sound volume unless turned up high, sometimes see letters mixed in with the bands twisted together, then over time the whole thing goes away to just a little bit of letters or bands showing on the right side. This tv is about 15 yrs old but has had only one problem about 2 yrs ago, replaced power module, until this started. Magic focus does nothing, turning it off, letting it reset or cool off does nothing, and I've tested the satellite receiver on another tv and its fine. This TV has not been moved or anything in a long time. What's wrong and how can we fix it? My hubby can fix things very well, just needs to know what to do or look for, if anything can be done.

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It sounds to be a convergence problem .

You need to replace convergence ic .

Posted on Nov 06, 2008

  • SAM ANDERSON Nov 06, 2008

    You need to change two STK392-110 convergence amplifiers.

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Have a 50fx48b Hitachi TV, screen flickers, gets wavy and goes to horizontal line, smack top of tv and it goes back to normal.


This problem is a couple of bad caps in the vertical and horizontal sweep area, just can't remember which. It use to be a 220uf cap that needs changing.

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How to set color, verticl and horizontal lines


Not all universal remote control's operate MENU button on TV!!!
If you have >>COLOR separation ( red blue green) and CAN NOT adjust via MENU button then you must replace conversion IC's>>
part number: STK 392-xxx.....easy repair!!

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Has pink/green horizontal line across top l corner


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Horizontal lines across middle of screen sometimes


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1996 Hitachi 50FX18B 50"


Yes - You will need to either remove the circuit board or lift up the tray. If you are not sure how to do it yourself read the link below.

  • This is a very common failure on Projection TV sets.
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
You can see some example photos and find a solution here...

http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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Samsung TV Model HL-R5067W


go here they are adjusting speed of the color wheel

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3 Answers

CONVERGENCE


Do not adjust any knobs as instucted in the previous thread if you TV have a convergence problem. Doing so will only make things worse. The blog does however show you how to fix other common problems with these sets.

Here are some of the most common symptoms and example photos of a convergence problem

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
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Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.

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1 Answer

Visual


The same is true for rear projection. There may be an adjustment for vertical hold in a hole in the back of the cabinet.

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