Question about JVC AV-27D302 27" TV

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Picture The top 2 inches of the picture is inverted. Usually the top of everyones head is upside down. Is this a vertical limit problem and how much would it cost to fix it? I have the same problem. It appears that the first sweep of the picture is normal, but the second interlaced sweep is not...the top part of the second sweep is shows up as inverted for about two inches from the top of the screen. The picture definition is a bit blurrier than I recall, also.

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There are a couple of capacitors in the vertical section of the TV that became defective.
If you are handy with a soldering iron and know how to solder you might be able to DIY.

Posted on Dec 14, 2008

  • Jaime Hernandez Dec 14, 2008

    Locate IC421 and C424, C425, C427 and C437. These are the capacitors that might need to be replace to restore the vertical scanning.

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Thin red line across screen two inches for the top. Picture above line is good, picture below line has no color and double image.


Hello,

IF YOU HAVE A SOLID BLACK LINE RUNNING VERTICALLY THEN YOU HAVE A FAULTY MATRIX INVERTER. IF CENTRAL THE MAIN VERTICAL INVERTER NEEDS CHANGED. LEFT = LEFT VERTICAL INVERTER RIGHT=RIGHT.........

ANOTHER WAY TO GET THIS FAULT IS WORN OR DAMAGED RIBBON/PLASTIC GOING FROM THE SCREEN MATRIX TO THE INVERTER

Hope this will help out.....

May 12, 2011 | Vizio L32 32 in. LCD HDTV

1 Answer

Our Panasonic model PTH 3778R has elongated its vertical size about 2 inches outside the screen limit. Is there a way of adjusting the vertical size?


Usually this means that a cap in the vertical circuit is starting to fail. Are there any other symptoms at all? Does the height seem stretched more at the top?
Dan

May 09, 2008 | Televison & Video

1 Answer

Lines across my tv where the picture is reversed


You have bad capacitors in the vertical deflection. And you will have to resolder the vertical IC as well. Replace the caps in the area of the vertical IC. Find a TV tech or hobbiest to do this!

Apr 14, 2010 | iLO IWT3206 TV

1 Answer

I have 32 inch toshiba analog tv with builtin dvd and vhs, the top of the screen is like rollong over , like when words scroll across they are upside down at top of screen? or the top of someones head...


The Vertical circuit is going out. A leaky capacitor is causing timeing problems with the vertical height and retrace. Adjustments may seem to help, but they will noot last as the part is failing and will get worse and worse until it goes out all together.

It will need to be repaired by a qualified Tech.

Dec 30, 2009 | Televison & Video

1 Answer

Visual transparent lines at top of picture


You have a vertical output circuit problem. This was common for Philips' sets. Have a repair shop check it out. Should not be too expensive to repair.

Oct 15, 2009 | Philips 27PT6441 27" TV

1 Answer

32A13 top part of picture is distorted


This is called Vertical fold over and is almost always a capacitor at fault.
This is an easy repair if you've ever soldered and would not be too costly for a repair shop to do it for you. The problem is a bad Vertical Output IC (usually mounted on an aluminum heat sink with the part on it labeled LA78?? ) and 1 or 2 bad capacitors. Some times you can even fix the problem by re-soldering the contacts of the IC- To find the IC follow the 4 wires that come from the Yoke (which is a contained coil of wires slipped over the neck of the picture tube(s)) back to the board. 2 of the wires go to the horizontal o/p and 2 to the Vertical o/p the thinner gauge wires are for the vertical.

Sep 27, 2009 | Televison & Video

1 Answer

Samsung 42 inch projection tv picture like watching coneheads seems to stretch


This is a symptom of a defective capacitor in the vertical circuit, but not usually with a DLP machine. Can you post the model number of your set please? I should be able to provide you with the part designation of the defective part once I get the model number.

Thanks,
Dan

Oct 27, 2008 | Samsung DLP HL-P5663W 56" TV

1 Answer

TV picture


This set will need to be serviced by a tech shop as you have a problem called "vertical foldover"...accordianman

Apr 09, 2008 | Emerson EWC27T3 27 in. TV/VCR/DVD Combo

1 Answer

White horizontal lines at top of picture


Yes, definitely worth fixing. 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 (no more than USD4.00 in price) usually gets it working perfectly again. 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.

Jan 17, 2008 | Toshiba MD24FP1 24 in. TV/DVD Combo

2 Answers

Picture problem


Sounds like you are in the begining stages of vertical foldover. This is a problem where the vertical driver waveform is distorted due to a component failure causing the beam to not be driven all the way to the top of the screen. Usually there is enough overscan that you would not necessarily notice the picture being smaller than the crt. When this happens the horizontal scan lines, which have not decreased, are all displayed on top each other or as the condition worsens they invert. This causes the symptoms that you described. The solution I use is to replace all the electrolytic capacitors in the vertical drive circuit. There may only be one bad one but finding it will drive you nuts. They only cost dimes so we're not talking much money. Without a schematic you can usually be successful if you replace all the electrolytic caps around the vertical IC. If you are going to tackle this be careful. TVs are dangerous. Remember to unplug the set and discharge the crt High Voltage anode. Good luck.

Jun 20, 2006 | JVC AV-27D302 27" TV

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