Question about Toshiba 50A61 50" Rear Projection Television

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The TV screen is not clear, its my friend said a out of focus tuning should be done, can you help me by telling how to do it.

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Some times this is due to focus tuning.this can be fixed by connecting the wire correctly.

Posted on Oct 16, 2010

  • shimari Oct 16, 2010

    Hm, Thank you, Yes I tried that Also but its not clear. someone told me abou a "out of focus" tuning. its behind the back of the tv a knob etc to turn to focus...do you know?

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My tv overall is blurry, but when I click menu to mess with the settings, only the picture of what I'm watching, and the highlighted word is blurry, but everything else is clear, video games and movies n...


Some of your electronics parts were worn out. Like capacitors may have leaks that need to be replace
as use stated that the word focus were very clear it means that your tube is still okay. or you adjust the focus knob on the compartment. To tune in the 3 colors.

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Hello
If the lines are thin and spreaded allover the screen from top to bottom, and are equally spaced around one inch of so apart, it will be a screen voltage rise problem. You just decrese both brightness, contrast and colour contols of your TV to zero position, and look into, where there is lines are visible on the screen or not. You should notice this in a drak room, so as to see is well, or close all the doors and windows to make the circumstance to a little bit dark.
If you can see these lines still, it is clear evidence of the above said fault. To rectify this fault you should open your TV. Open the back cover of the TV, and you will see a Line Output Transformer. It is otherwse known as LOT. It can be recoganiized easely as it its size. Normally it will look black in colour and a thick wire from it goes the picture tube's final anode, and look like it is stcked to it with the help of a rubber ******. Other two wires from it goes to the picture tube base board. These two wires are, one for focus and the other for screen.
There will be two controls on the lot, which can be varied, and seem to be integrated with LOT. Among, upper one is for focus adjustment, and lower one is for screen adjustment. Both will be marked as "Screen" and "Focus". You just find out the screen control. With the healp of a screw driver it can be adjusted.
Keep the TV on, Brightness, Contrast and colour to minimum, adjust this control to a little [ a very little movement should be done, otherwise the picture will be get blurred], to just eliminate the lines you see on the screen. Focus control and screen controls are interactable, that is adjusting one may effect the other. After eliminating these lines just up the brightness and contrast control to at about their mid position and press the menu button on the TV or remote control to get the menu screen. Look at the letterings, and if it seem to be out of focus only, just adjust the focus contorl to get well focused captions. The adjustments are hot, that is while the TV is operating. Take care. Ok.

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Two things, I was using a flaky budget=price SCART cable which caused a colour probolem. A techie friend said to view on AV rather than TV, which worked.

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1 Answer

Can not tune the tv


My dear friend. A TV is a TV and TV's are many and varied. If you stated the model and what it exactly does, maybe I or other people could help you instantly. But since you have said little in relation to TV tuning, then expect a few guys to help you. But allow me to give you a hint that applies to almost all flat panel TV's, ok? Right. On every TV there is a MENU that gives you many options. First you need to press a button on the remote that displays component connection channels and TVincoming signal type. Since I don't know what brand of flat panel TV you have, I can only ask you to find and press the button on the remote that displays on TV screen the following component channels, that is DVT, AVT, Component 1, Component 2, HDTV1, HDTV 2, HDTV 3 and so on. Apart from DTV and ATV, from Component 1 to HDTV 3, these additional channels are for DVD players that also have HDTV outputs and BlueRay players and or Audio devices. If yout TV hasn't got as many channel input, then ignore this part. To tune your TV you have to first press the butoon on the remote to activate the onscreen channel as above, then scroll on DTV or ATV and, depending on whether you have Digital TV in your country or the standard high resolution Analog TV. Lets say you have Digital NTSC format TV system, select it and then press ENTER on your remote. In the menu you find and click SCAN. Depending on where you are, the TV will begin scanning all frequencies in your territory and possible interstates if the modulator is powerful enough to pick up weak signals. Most TV's have an inbuilt set-top box that boost the signal to give you a crystal clear pic. Now, after pressing SCAN, the TV reaches a signal with a clear pic, all you have to do is recognise the channel that comes in view. The instructions on how to save that channel are on screen and then you can configure it as, say channel 4, if the channel that appeared is channel 4, if not, try and recognise what channel had appeared and then configure it with a number, so when you press that number on the remote it will be the same channel you had stored in the TV memory. After you have done this, press scan again and it will scan to the next channel. Once the scanning recognises another clear signal and it is as clear as a baby's face, you have recognised the new channel. Try, find out what channel it is by looking at the screen, there is usually a visible TV station name or number embossed on the lower corner of the screen, once you know what station that is or what channel number it is, configure that number and press ENTER (save) button. Do the same with the remaining channels. Later I will tell you how to skip unwanted blank channels that usually have no signals but snow and lines, or have faint signals that can only be boosted with a TV booster available from reputable TV retailers, or install a bigger more powerful antenna.

Reagards.
Mike

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1 Answer

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Remove front bottom panel behind it is a small black control box top controls are focus controls for R/G/B and Bottom 3 controls are your screen drives adjust one at a time turn off G/B adjust red first,then Do Green and Blue fter adjusting focu to each tube leave them set then adjust screen drive turn color off adjust RGB for a Black and white picture get as close as you can then turn color back If after doing this you still have blurry looking picture look down into Tubes you should be able to see picture clearly in each one if you cannot see picture then projection Fluid need to be changed out. Call Mats 1-800-628-1118.

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1 Answer

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CRT tv's have a FOCUS adjustment on the flyback transformer. There may also be a "screen" adjustment on it, but you DO NOT want to turn that one.

You would have to open the tv, and take an INSULATED TOOL and turn the little adjustment labeled FOCUS or F on the flyback transformer, which is the large (usually black) thing that makes the high voltage for the CRT. It can easily be found by tracing the large red wire that has a suction cup at the top of the tube in the back. This wire goes to the top of the flyback. the focus is usually on the side of the flyback.

IMPORTANT!!!!

You must be very careful when doing this. Use a mirror to see the front of the screen while adjusting, don't reach around! Since this is the part of the TV that has LETHAL voltages you must be VERY careful not to touch anything else, since this must be done with te set turned on and warmed up.

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1 Answer

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