Question about Projection Televisions

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Picture/image problem Frequently the picture on the television will reduce to a narrow horizontal white line the length of the screen (with black on all ohter areas). It will resolve sometimes with a firm slap on the top of the television. Sound is functioning normally. Panosonic Model CT-27S 5CV (1998)

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Re: Picture/image problem

Hi, re-solder the vertical output IC and surrounding parts, bright line left to right in middle of screen with black above and below this line is total vertical collapse, the fact you can "smack" the tv and make it fill the screen says it`s broken solder, BMW Rider

Posted on Jan 09, 2008

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Re: Picture/image problem

Bad solder connection in the horizontal pincussion circuit.have someone resolder.God luck.4tune

Posted on Jan 09, 2008

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Bulb replacement will only repair reduced brightness or contrast problem. Sometimes shadows or lines (usually curved or circular) appear in the image if the bulb is weak or faulty. This will show with the color turned off and a black and white image displayed.

Most visible color faults are caused by optical engine failure. Big cost, as the complete assembly has to be replaced.

Occasionally there are video processing or tuner problems that require serious troubleshooting to determine what board has to be replaced.

If the fault is not visible on the customer menu and appears only with input signal viewed, you may have a cable box or other signal input problem. Check various input signals to see if the problem is visible with all inputs.

Running the channel scan with vhf input signals sometimes clears up a lot of problems. Your cable company may have changed or adjusted rf modulators or other equipment and the tv needs to be aligned to the changed signal. Auto tuner scans will take care of these problems.


Apr 22, 2010 | Panasonic PT-50LC14 50" Rear Projection...

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The brightness is very dark. Any nightime scene

Your CRT's getting old. Plus dust on lenses don't help much. You have to open front frill (below screen) and back of the TV. Clean up lenses using dry paper towels, do not wet.
In front of the TV after grill remove center cover and locate "black box" that have 6 potentiometers on it that looks like plastic adjustment screws for philips #2 screwdriver slots. 3 of them should read "Focus" These you don't touch. Another 3 reads "Screen". Put some still image on your screen (like paused DVD movie frame). Carefully add brightness in all 3 colors trying to avoid horizontal lines appearance. If lines show up, just turn it back a little. Try to keep color balance looking at the picture.
This procedure will brighten up image but further reduce CRT's life.

In case that you posted wrong model here and you have DLP Projection TV - just replace the lamp.

Mar 09, 2010 | Pioneer SD-643HD5 64" Rear Projection...

1 Answer

Picture Problems: Snow, color, lines

The most likely cause is shorted convergence chips and possibly a few pico fuses.

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony,Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer2_bing.gif Hitachi,Mitsubishi,Zenith and others.
You can get a convergenece repair kit with instructions from the links below.

Here are some of the most common problems with these sets...

Problem #1) Convergence

Yours may have one or more of the following symptoms...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2
Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

You can see some more examples and find a fix herebb0cf99.png

Sep 23, 2008 | Sony KP-53XBR200 53" Rear Projection...

1 Answer

Toshiba 61H70

Does it look like a 3D image?
Would you be able to post a picture of the TV with the mention lines?

Aug 16, 2008 | Toshiba 61H70 61" Rear Projection...

1 Answer

White horizontal lines on screen

Replace all electrolitic capacitors on the Proscan pcb.

Dec 11, 2007 | Projection Televisions

1 Answer

Had horizontal Lines replaced now have error 21 xray circuit

White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
Replaced the frame chip TDA8356, set now ok
Severe vertical jitter on picture, horizontal sides of picture ragged
Replacing the TDA4950 cured the fault
White line down centre of screen (top to bottom}
Replace C805

Nov 24, 2007 | Mitsubishi VS-60707 60" Rear Projection...

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Lines on tv

Set starts, horizontal and vertical deflection work, HT ok, crt heaters ok, but no sound or picture
I turned the G2 voltage up and noticed a white screen with flyback lines, frame ok. I detected two badly soldered double diode rectifiers in the secondary part of the power supply ! I checked all other joints, and everything was ok !! success
White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
Replaced the frame chip TDA8356, set now ok

Nov 23, 2007 | Mitsubishi WS-65511 65" Rear Projection...

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