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How to manually adjust the centering of the picture

The old TV's had adjustment features on the back to center the screen image. My new Samsung out of warranty is having a problem with the picture being centered properly. Anyone know anyway I can adjust it by myself?

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Re: How to manually adjust the centering of the picture

On newer televisions the centering adjustment is only in the service menu. I wouldn't suggest anyone accessing it unless you understand all of the abbriviated alignments.

Posted on Feb 22, 2007

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If this is transistor driven circuit replace the transistor. The component
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Tv out of foucs

These procedures are from the owners manual, go into menu and then picture quality and then: Convergence The Convergence feature lets you adjust the TV’s three tubes. When the TV tubes’ images are precisely aligned, they create the color images you see on the screen. Over time, the picture can drift out of alignment (this is normal). If your picture seems fuzzy or has a yellow tint, using Convergence could correct this misalignment. Only one convergence is needed for all inputs, regardless of the signal format. Note: Make sure the TV has been on for at least 30 minutes (TV needs to warm up for best results) before starting Auto Converge or Red/Blue Centering. When you select the Convergence feature, a submenu appears with three options: Auto Converge Automatically aligns the projection lenses to self-correct color images. You’ll see flashing squares of color dance across the screen (this is normal). Note: After performing auto convergence, use the Blue Centering and Red Centering menus to fine tune convergence in the center of the screen, if necessary. Blue Centering Aligns the blue and green images to fine-tune the picture. Red Centering Aligns the red and green images to fine-tune the picture. Note: The ability to change channels is disabled when adjusting the convergence options. The TV must be tuned to a usable signal to converge the picture.

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keep tv off.
it will only get wors
if sumon dosent work on it soon
the problem you are having in the vertical section of the tv
hav a repairman resolider all conection on the vertical IC and check the serounding componets for falts.

regards daniel.
PS the repair takes me about 15 min.

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1 Answer

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The vertical height driver that controls the height of your picture has weakened and needs to be adjusted. If you are somewhat handy you can do this yourself. It requires that you gain access to back of the set & remove the cover. Once removed, locate the vertical height & centering adjustments. Sometimes they are located on the main board & other times are located on the color gun driver circuit board that is plugged into the end of the picture tube.

Respond to this post if you need additional assistance. Good luck!

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Had the same problems.  This was after the a power outage.  Had green vertical and horizontal lines, like a checkered shirt.  But I searched online and found the simplest solution.  Just unplug the power.  And it worked.

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This is a defect in the vertical scan amplifier. It is not an adjustment. Most of the time there are a number of capacitors in the vertical deflection amplifier that can cause this type of fault. Sometimes the output drive IC can cause this fault, but more rarely.

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Jerry G.

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hi there, try to adjust it in the remote control, else you have to open it for check up., some unit have adjustment inside the unit, you may have a very high voltage output, check the power supply section. do some test. ty

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hi there, you may have a power supply section trouble, check the biggest electrolytic capacitor in the power supply, the rectifier diode, the regulator, and check for some cold solder, do some test, there is a part to be repalced. ty

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1 Answer

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When you replace the entire board in a Zenith TV, you must make the adjustments to align the new chassis with the old picture tube. You must adjust the CRT bias and drives as well as the horizontal and vertical parameters. On the older boards there were controls on the main and CRT boards but on the newer boards the adjustments are made with the remote control after entering the service mode. Tune in the shopping channel QVC, set the color and contrast to minimum and lower the brightness until the picture is just visible. Set the CRT bias settings for a pure black and white image, then increase the brightness and contrast to get a very bright picture and if necessary adjust the drive settings so that the bright picture is pure black and white. Return the video settings to normal and then adjust the vertical and horizontal settings so that the info boxes on QVC are centered top, left and bottom. If you are not sure that you can do that right then have a qualified tech handle it for you.

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