Question about Philips 27PT6441 27" TV

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Spacd lines across top of screen, perhaps 4 or 5 inches. Sort of "folded" over picture. Width of lines narrowing in a bit as the band goes lower.

Anything I need to know safety wise before replacing these capacitors? Do they need to be discharged first to avoid electrocution? And if so how?

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Its just ok no need to discharge coz the section wher you replace a capasitor is vertical section

Posted on Oct 01, 2008

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There's a picture on the screen, but it has lines all across it.Sometimes it will be clear, but most of the time it has lines. I also have directv, but they've installed a new box. Is this my television...


Hello
If the lines are there, and are across the screen at about an inch apart the whole screen from top to bottom, it is due to a slight increase in your TVs screen votage. It can be adjusted.
Open the back cover of your TV. There is an LOT [Line Output Transformer], can be seen directly soldered to the printed circuit boar of your TV. It is the largest component inside your TV, which have usually three wires emerging from it, and one thhick wire goes to the final anode of the picture tube, and will seem to be sticked to the top of the picture tube with the help of a rubber ******. Other two wires goes to the base card of the picture tube, a circuit board.
The said [LOT] has two controls integrated on it facing you as you open the TV. Among the top one is focus control, and the bottom one is screen control. Both of them are variable resistors, help to adjust focus and screen voltages respectively.
As set powered on, keeping the brightness, contrast and colour controls to its minimum, turn the screen control a little bit counterclockwise [not more, a little bit] will eleiminate the lines on your TV screen.
Take every precautions we have to, when working with an electrical equipment. Keep children away from you while you are working on it. Never allow them even to come beside you. Keep an adult beside you as a precautionary measure. Ok.
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No,Ur vertical/horizontal IC is shorted or cold soldiers.Could be the parts that support the IC is also.

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I get a strip about 4-5 inches of fine lines at the top of the screen


What you are experiencing is called “vertical fold-over” the vertical size of the picture is too big on the top and is folding over, causing retrace lines to show on the screen. The reason why it comes and goes is because it is caused by a leaky cap in the vertical circuit.
Replacing this capacitor will fix the problem, finding it is another.
If you are handy with a soldering iron and would like to attempt the repair. I will try to help you.
Let me know.

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May 08, 2008 | Televison & Video

1 Answer

TV Picture Reduced to Line across the Middle


This is called field-collapse. Either

1. The problem lies in the vertical deflection voltage-doubler circuit. The usual fault is a single capacitor of 100uF/35V that has failed. It is normally connected to a rectifier diode right at the vertical IC. Replacing the capacitor usually gets it working perfectly again.

or

2. The vertical drive IC has failed.

If you are finicky around technical work, then a reputable local repair shop in your locality should do it quickly for you and charge only labour.

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Horiz. lines across top of screen.


I agree with solution #2

I recently had my phillips 27" model 27PT6341/07 repaired after warranty expired due to white lines appearing at the top of the screen. The shop advised that it was a capacitor giving me the problem. So, after getting it back, I examined the repair job and the shop had replaced a capacitor at the back of the main board, next to the rear rca inputs. It is labeled 10uf 100v. I was told that it would fail again soon because it is a manufactures defect. For me it is at location 2465. Here are a couple of photos of the part.
http://farm4.static.flickr.com/3215/2337629026_eaa30cfa18.jpg?v=0

http://farm3.static.flickr.com/2411/2337627420_b45bbf1a74.jpg?v=0

Good luck,
Ed

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1 Answer

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Bad capacitor in vertical output IC circuit + check power supply
Last, replace IC.......................T.

Nov 09, 2007 | Philips 27PT6441 27" TV

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Hi. this is caused by dry solder joints on the frame o/p IC. Resolder all legs of frame chip. Should sort that out.

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1 Answer

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Those lines sound like "retrace lines" and several things can cause them. The most common are shorts inside the picture tube and shorted semiconductors in the video driver circuits. They can also be seen if the blue screen voltage is too high or if someone has tampered with the screen voltage control.

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