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27MT5005D vertical foldover

Vertical picture is shrunk at top and bottom with fold over at top

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Re: 27MT5005D vertical foldover

You have bad capacitor(s) in the vertical circuit.

Posted on Dec 06, 2007

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A black line (about 2 inches wide) appears at the top of the screen with this amount of the picture looking like it is folded down translucently over the remaining picture. What's up?

Your TV has vertical fold problem. Just check all the electrolytic capacitors. On checking, most of them may look good. But on circuit, when energised, will show problems. So it is best to replace all of them once and check. Please check the electrolytic capacitor connected to the vertical power supply [usually comes from the secondary supply section of the Line Output Transformer], first, and replce it. It may be a 1500Mfd or 2200mfd. Check it first by replacing a new one. In most foldover cases, this service will solve the problem.

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Lines at top of screen, about 4"

This is due to vertical deflecton problem, there is some capacitors that has gone bad and need replacing. It might just be one cap rated at 100uf 35 volts. This is called vertical foldover eventually the top will fold over or you will get a 4" black border on the top of the scrn.

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Mar 19, 2010 | Standard (CRT) Televisions

1 Answer

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This is caused by a defective capacitor in the vertical circuit. If you can solder, you should be able to fix this your self. Let me know if you wish to attempt the repair and I will supply additional details and instructions.


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sound like a bad capastor. This is called foldover. Could be the main ones in the power supply dont know for sure but that is whare i woul start. If youdont know how to fix then take to a shop for repair.

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Philips 27p6441/37 has a foldover

Bad capacitor / IC in vertical circuit...usually a shop repair...
If not corrected,could get worse in short period of time,.....T.

This model also requires an upgrade kit for future reliability...
Philips part number 483531057673 senior tech only.......

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If you have a picture but the top is folded over, your vertical IC is probably good and you need to replace the pump-up capacitor next to the IC. When the pump-up cap (typically a 47 or 100uF 35V cap) is open then the picture will have white lines and foldover at the top. The typical vertical output IC is the LA7838, but I am not familiar with exactly which output IC your set uses.

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The picture on your TV screen is driven from the center to the top and bottom of the screen by the vertical drive circuit. The fact that you can see the entire picture means you have a problem called foldover. This is caused by a failure in the vertical drive circuit where the vertical saw signal is altered by a component failure within the vertical drive circuit. You cannot solve this problem but any good repair shop should be able to correct the problem at a reasonable cost.

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