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

1 Answer

Convergence problem You responded to my problem by suggesting that I adjust from the internal focus adjustment block on the flyback transformer. After gazing at the internal components for quite some time I did not notice anything that resembled an adjustment. Can you help me locate the adjustment you refer to. I really can't afford to call out the service people. Thanks

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  • Anonymous Nov 16, 2008

    I noticed something that resembled a transformer but noticed nothing resembling an adjustment. Can you help?



    Thanks again

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Convergence problem - 8ff6cdd.jpg
This is a common television flyback transformer , it has two potentiometers ( POTS ) variable resistors , how ever you wanna say it , the one above has 3 , one of them is the focus

you can use a plastic screwdriver or plastic wand , or small metal screw driver if nothing else

Here's a closeup of one that has only two potentiometers

ed6c36f.jpg
One of them is the focus adjustment

to adjust the focus/sharpness of the image you see on the screen

1. find which one is the focus , you will know because adjusting it out of calibration will cause
the screen to go out of focus untill you adjust it correctly.

to adjust it correctly , rock it back and forth untill you see the sharpest image , then your done.


if you accidently get the wrong one by mistake your screen will increase in brightness
set the brightness lower rather than higher , because you don't want it to be over saturated.

Az.

Posted on Sep 16, 2008

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1 Answer

Image not focused


Possible worn out tube. The focus adjustment is on the flyback transformer and has to have the back cover removed to access it. The flyback will be a black and have a red wire connecting to the crt tube. This is very high voltage and can be dangerous. With a plastic screwdriver you can turn the focus adjustment knob on the transformer. Do not adjust the screen control knob. If the focus does not clean up, then the tube is probably worn or the flyback is bad.

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There are two buttons on a big black block of plastic call FBT-known as flyback transformer.One button for adjustment for brightness and darkness of the CRT tube screen the other button for the crt tube screen focus.U can easily do adjustment with a flat head screw driver.

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How do you adjust the focus


The flyback transformer located in the rear of the tv, might have to take back off( usually some have holes to adjust from back). There will be two potentiometers on the back of the flyback. Top one is screen, bottom one is focus. Put a mirror in front of tv and adjust the focus potentiometer.

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This must be adjusted by a professional television repair center

Or if you are me you can open it up and start looking for the internal focus adjustment block
normaly located on the flyback transformer

I highly recommend you don't go digging around in there unless you know what you're doing.

I'm not responsible for accidental death due to following my trouble shooting procedures.

Safety First !

Shalom >:D<

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My amigo , your monitor is most likely gettin old , Operating systems and video cards do not blur monitors unless you ordered them to do so , I'm a fully qualified monitor technition this stuff happens all the time , basicaly it's the focus block of the monitor , if it's not serious you're lookin at a few bucks to have it worked on , if more serious expect to pay more ,

and if you are me , you put on your ground protection and you open that monitor up and adjust the focus block on the flyback transformer , as CRTs age a bit the focus block needs adjustment , I can also tell you that if you plan on doing it , READ any and all documentation on how to adjust a focus block before you do it , and wear ground protection ( or if you're not scared to die like me , just use your plastic screw driver on the focus block and adjust the little dumpling. it's not rocket science in this particular situation just a focus block adjustment , and if that fails , it's time to chunk it , because more than likely it's about to totaly fail.. and easyer to buy a new one..

focus fuzzyness is a sign of bad things ahead ( 50% of the time. )

Again , if a simple focus block adjustment doesn't do the trick , I'd just chunk it and get another one
unless you're a hardware monkey like me who went to electronics school ...

And above all wear ground protection ...

I'm not responsible for accidental injury or death from following my advice on this , just trying to save your monitor.

as for a solve on this , it's a matter of your willingness to adjust the focus block which is on the flyback transformer , scary and dangerous not recommended for those who haven't made their peace with Elohim and are clumbsy lol

I hope this still gets counted as a solve

shalom >:D<

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try the focus adjustment knob on the back of the flyback transformer....if that does not work...order a focus block

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Remove the rear cover and adjust the focus control on the flyback. Use a non-conductive probe, available as adjustment tools from any radio shack. On the FBT (Flyback Transformer) you have two protruding adjustments - one marked screen, the other focus. The screen adjustment increases the G2 voltage to the crt and brightens the picture by increasing the voltage exponentially. You don't want to adjust the screen voltage. The other is the focus, you can easily turn that clockwise or counter clockwise and watch the screen to set it at your preference.
Hope this helps.
Bill

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1 Answer

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thr focus block assy.has the screen and focus controls on it it about 3"x3" in size has red wires attached to it and one feeding form the flyback transformer to it.

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No its a tube and not a bulb. If thew line is green then theres an issue with the red and blue as the green is stationary on most sets unless thers a green centering ? Its a componet on the convergence board thats bad or going bad but if you replace any components on the board most likly your gonna need to do a convergence alighnment I would let a pro handle this repair unless your an experineced repair tech Good Luck

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