Question about Hitachi C29-F100 29" TV

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Narrow screen black lines at the top and at the bottom of the screen

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  • vikino Oct 18, 2008




    Black lines at the top and at the bottom of the screen


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The problem of your tv is in vertical section ,if can locate a trimer( vertical position) try to adjust it and see the effect on screen.

Posted on Oct 19, 2008

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The top half of the screen is at the bottom...and the bottom half is at the top of the screen...theres a black line through the middle...why is this happening please...


The fault is with its vertical scan output stage circuit. Contact any service technician. This is not a user reparable fault. [Out of Sync: picture].
Gopakumar Gopalan Google

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It is a calibration problem, let me see if I can find some schematics for your tv.

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Disney princess tv suddenly narrowed the visible part of the screen. Now everything is squished into a two in wide band with all the rest of the screen is black.


if that 2 band according to you from top to bottom,it has a defective vertical stage.if this two band appears one on top and one at the bottom,it`s on vertical stage.leaky capacitors,resistance changed or resistor devalued ang ic`s, are too weak to amplify a signal to make the screen complete....

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1 Answer

Wavy horizontal lines across the screen


It sounds that the main power supply section to your TV has the fault. The horizontal thik lines that appears crawling down across the screen should be of video 'HUM'. Have you replaced the main filter capacitor at the power supply section? If not, replace it along with the main rectifier. The AC power is rectifed by a bridge and applied ot this main filter capcitor. It will have a capacitance value between 120 to 350MFD 450VDC. Check this section. Measure the rectifed DC voltage acorss this main filter capacitor. It should be around 350VDC, if your home power supply line is 220VAC. If it is 110AC, this DC voltage will be around 165VDC; and it should be. If rectified DC voltage found lower than the input AC voltage, replace the rectifier bridge. In some sets, this bridge section have four diodes. Some other circuits, a bridge rectifier stalk may be used.

May 20, 2012 | JVC AV-27050 TV

1 Answer

I have a Sony FD Trinitron 27' Model # KV-27FV310. It is approx 8 years old. After turning it on and watching a full screen for a few minutes; all of a sudden, a line came across half the screen;


top half missing is in vertical circuit of set---if it is a 27 inch and this old consider retiring it and replacing----other option is consider having a shop repair it--a rough guess would be as high as 150 dollars parts and labor is possible for your problems.

May 01, 2012 | Televison & Video

1 Answer

I have a Mitsubishi CS 3515R 35" Tube TV. The screen has narrowed at the top and the bottom so only about 2/3 of the horizontal screen has picture. There are black areas at the top and bottom....


There are two issues, the first is a vertical deflection problem, "needs a few parts+an ic" the second problem is intermittent color, "crystal and color processor ic" If the set is close to 10 years old then your money is better spent on a new tv.

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1 Answer

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Nov 02, 2009 | RCA F36TF720 36" TV

1 Answer

Black screen with a line of the picture running


The vertical sweep generator is dead. The circuit that controls the lines being drawn from top to bottom has malfunctioned or died. This not something you can fix, you will need a professional.

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Repairing JVC AV-27D202 27" TV


This is caused by a bad capacitor in the vertical circuit. If you can solder, you may be able to resolve this yourself. If you wish to attempt this repair, please update this and I will provide additional details and instructions.

Dan

Mar 21, 2009 | JVC AV-27D202 27" TV

1 Answer

Picture reduced to 1/4 on a black screen


Picture is reduced to a straight horizontal line across the center of the screen.

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