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Screen shrinkage zenith SR2765S tv image shrinking to about 3 inches vertically. Also reddened image no matter the color adjustments, generally only on specific channels though.

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The vertical shrinkage is a fault in the vertical deflection circuit, suggest replacing capacitors around that area along with a vertical output IC. I can provide more info if you've got some electronics experience and going to try and tackle it.

Posted on May 18, 2009

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Picture is 1" across screen


The vertical deflection section has failed. It could be a myriad of different things and if you are not technically minded and have an oscilloscope then all you can really check is the integrity of the soldered joints, and capacitors on the circuit board. Chances are, because you have at least an inch of vertical deflection then the fault will be a capacitor that has gone out of specification, usually high. Check around the vertical section for capacitors that have the plastic wrap shrinking on them, or around heatsinks. This is usually a good place to start. Replace any suspect looking ones or remove from the board and test individually.There will not be any user friendly vertical adjustment control. Who knows you might get lucky! Good luck

Mar 21, 2014 | ESA ET432E TV

1 Answer

Picture ok with a 6 inches blue vertical line from top to botton


For a five or 7 inch band we have a fix. Six is a big problem. A vertical band is either a sync condition requiring an adjustment of one or more pots on the circuit board. Usually the condition is Horizontal and rarely up and down the screen. LED is generally very reliable and two of 3 colors within the diode in your case (one red and one green) are not working. If this TV is in Warranty, replace it as you cannot fix this yourself.

Jan 10, 2014 | Samsung UN55EH6000 55" Class LED HDTV...

1 Answer

How i adjust horizontal size and vertical size


To answer your concern, all you have to do is to change the setting of your aspect ratio on your TV.

Here is my suggested way to procede:


1. Apply 1080i signal, which should produce an oversized HD image on ColorStream1or 2.
2. Select an HD channel that is broadcasting standard 4:3 image, not wide screen.
3. Switch to the Service Mode ( Please refer to the above links). In the Service mode, press channel up/down to find the Adjustment parameters needed for the following steps.

4. Adjust HIT with volume up/down control for the image height to 22.5 inches.

6. Adjust WID for image width of 30 inches, (22.5*4/3)
7. Adjust HPOS to center the image.
8. Adjust PARA and TRAP to minimize geometric distortion.
9. Switch into Convergence mode and Adjust VLIN to get equally spaced horizontal grid lines.
10. Measure the length of the central grid lines and note the number of horizontal and vertical grid lines. This information is used to create an overlay grid.
11. Create the overlay grid on 40x25 x0.003 inch clear Acetate sheet, which you can get at the Art Supply store for under $2. Draw the grid with a fine line erasable pen. Draw vertical and horizontal lines through the center of the sheet so that the lengths are the same as the central grid lines. Now draw the grid so that it has the same number of lines as the convergence grid but are equally spaced, with the outer ones at the ends of the central lines.
12. Cut off about 1/4 inch from the right side of the sheet so that the sheet can lay flat against the screen, which is slightly less than 40 inches.
13. Put a reference mark on the TV frame 2.5 inches down from the upper left side of the screen.
14. Place the overlay on the screen so that the upper edge lines up with the reference mark. The overlay sticks by electrostatic attraction.
15. Use convergence controls to remove grid distortion and converge grid colors. Refer to the Anamorphic link for details.
16. Enjoy 1080i.

Other Comments:
I didn't realize I could create the overlay grid before placing the Acetate sheet on the TV screen, until I finished drawing the grid with the sheet placed on the screen. I added grid lines as called for in the procedure. I'm sure this method took much longer no only to draw the lines but some of them were difficult to see.

Part way through the convergence procedure, I became concerned that the image width was off since I did my screen adjustment with wide screen image. Thus, I decided to repeat that step with a 4:3 screen.

I confirmed the need to press 7 often to save results since after I adjusted one grid color without it, I accidentally hit a key that switched me out of convergence mode and when I switched back, all settings were gone.

Another mistake I made was not realizing that the cursor color determines which grid gets moved.


May 13, 2011 | Toshiba 32AV500U 32 in. LCD HDTV

1 Answer

27 inch Zenith TV Vertical too big


If you are using a DTV coverter box, you may have changed the aspect ratio with your remote control. look for a button marked "aspect" or "picture size" use that to change size.
If you have a cable box, you may have a similar button.
Or you may find a picture size adjustment on your TV remote.
If you do not have "aspect" button on your remote try going to set up menu and look for picture size.
Older TVs used to have a vertical size adjustment at the back. look in the manual.
If none of the above, you have a biiger problem with the TV internal parts needing attention

Mar 03, 2010 | Zenith C27A24T 27" TV

1 Answer

Can't adjust screen


HAI,REPLACE MAIN FILTER(CAPACITOR)IN VERTICAL SECTION.

Jul 05, 2008 | Zenith Televison & Video

1 Answer

Toshiba 36 inch TV (8 Years Old)


Hi,

If the shrinkage is just the top & bottom then it is relatively easy/low cost fix. Most probably, a capacitor in the vertical section is nearing end of its life. This would be the biggest of the bunch and would be something like 47uF/50V.

If however, the shrinkage is on all four sides, then it is the master power supply that is at fault. Chances are the main B+ is getting low which cold be caused by the big filter capacitor or an erratic regulator. This is not a simple fix and would require the services of a qualified professional.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Apr 10, 2008 | Televison & Video

3 Answers

Easy one - image shrinking when TV gets WARM


resolder the vertical IC's leads. you may also have a failing capacitor in the vertical deflection circuit test them one at a time with freeze spray. or use the ex's cold icey breath.

Feb 03, 2008 | RCA P52926 52" Rear Projection Television

1 Answer

Horizontal line in top screen


could be vertical output IC or capacitors located close around the IC

Nov 27, 2007 | Zenith B25A24Z 25" TV

1 Answer

Zenith console tv model sentry 2 27 inch


Resolder the vertical deflection section. Change pump up capacitor if it has one...100uf is a typical value. Is the vertical output some flavor of LA783x ?? May need to replace. A model # would help.

Nov 04, 2007 | Televison & Video

2 Answers

Screen Size is Too Big


There should be a vertical height adjustment control potentiometer near the vertical output IC on the right side of the PC board near the front section of the TV that can be adjusted to shrink the picture vertically. Be careful not to short anything out or getting yourself shocked in the process if you decide to try to adjust it yourself. Good luck. This chassis has also been known to have bad solder connections in that area also, so don't man-handle the printed circuit board roughly.

May 23, 2007 | Zenith D32D51 32" TV

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