Question about Toshiba 27AF45 27" TV

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My Toshiba TV Model 27AF45 has white horizontal lines across the screen (about 10-15 equally spaced lines from the top edge to 3-4 inches down from the top of the screen). These appear to be reflections whenever there are light areas at the top of the screen. When the picture has dark areas at the top the lines are not present.

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Go to the vertical section n change caps like 100uf, 2.2uf around the section in addtion check some caps in the line o/put like 22uf 250v

Posted on Jan 09, 2010

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Posted on Jan 02, 2017

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So I have a 50 Lg ( LG 50LN5700). There is still a picture however about every 3 seconds it goes from regular to blurry and repeats. There seem to be about 3 black lines across the top horizontally about 3...


To clarify, are the 3 black lines horizontal (left to right across entire width of screen)? or are the 3 black lines vertical (top to bottom across entire height of screen)?

Horizontal lines are almost always the result of a failed panel, and no board replacement will fix the issue.

Vertical lines such as you have described (only 3) are probably also a bad panel. If the black lines were evenly spaced in a repeating pattern, it could be a mainboard or TCONN board.

Has this panel been cracked? or perhaps cleaned recently with too much water or cleaning solvent that has gotten the screen wet?

You may have to sell the TV for parts.

Oct 23, 2017 | LG Televison & Video

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

Horizontal white lines across top of screen. About two inches from the top, some channels more pronounced than others but always there.


Check for dry electrolitic capacitors near the vertical Ic output maybe one of 50v to 100mf or 50v to 10mf

Jul 24, 2010 | Toshiba 27A43 27" TV

1 Answer

I have white horizontal lines about 2 inches at top of my tv


You have some bad grounds on the Vertical IC. In addition to this, in the immediate area of this Vertical IC, are a few bad capacitors. Look for this IC mounted on a large heatsink. It may have seven pins . I cannot remember for sure. I have not worked on this particular TV, so I cannot give you specific locations. But I assure the problem is in this area! If you have some electrical experience you can pull this board out. In this case only the caps need replaced and the IC resoldered. Good Luck and thank you for asking. If you have anymore questions, visit me...Thanks Again! Your south of the border tech!

Apr 27, 2010 | Toshiba 32A14 TV

1 Answer

My tv has white lines that run up and down across whole screen. it has like 4 lines then a inch space then 4 lines and a 3 inch space My tv is a SAMSUNG HL R5667W


Power supply board, Look for bad capacitors they will be vented or puffed up on Top.
Encompass parts has whatever you need for this model
1-800-638-3328

Mar 02, 2010 | Samsung HLR5667W 56" Rear Projection HDTV

3 Answers

Horizontal white lines across top of TV screen


Hi I had the same problem. Broken white lines across the top of the screen. This is called overscan. You need to go into the Setup menu, other settings. 16:9 overscan needs to be on. Hope this helps.It solved our problem.

Sep 15, 2008 | Panasonic CT-2006S 20" TV

1 Answer

Toshiba 27


you just say horizontal lines / and across a top of your television.I expect your trouble is the vertical line of your television . sound ok? try trouble the vertical section the check the resistor?

Apr 19, 2008 | Televison & Video

5 Answers

Horizontal lines across the top of the screen


it is a fault in one of the capacitors in the vertical part of the schematics it is 33uf -160 volts capacitor , dry out and need to replace refer to qualified , regards , plz don't forget to rate thx

May 02, 2007 | Toshiba 27A44 27" TV

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