Question about JVC AV-27D302 27" TV

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Picture problem top 4 inches of screen looks whiter then the rest of the screen, sometimes lookes inverted

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  • Anonymous Apr 01, 2014

    When looking at the screen, about 15 inches from the left is solid black, with a defined stopping line going from the top to the bottom. The rest of the TV looks perfect.

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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.

Posted on Jun 23, 2006

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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main digital board./

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Change input device to some other like a DVD player. Look for loose contacts in RC jack, cable, sockets. Look for any jammed buttons on TV or on remote.

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When I power on my laptop it be's a white screen and then goes black after a few seconds. I can hear the sounds and everything else works normal. I'm confused about the problem.


You have a failed backlight or an inverter issue. Look at the screen from about an inch away and check if you see a dim image. If you do, it's the backlight only. For a replacement backlight, see http://www.lcdparts.net/CCFL3D.aspx (look for the Lenovo/IBM and your screen size). To replace the backlight, take the screen away from the bezel (sometimes it is held with screws) Remove the tape, and the frame holding the parts together and separate the reflector (make a note of how things are put together) then you have to Dremel (or use another rotary tool) to remove the plastic to get the backlight out. (They are often molded into the frame.) Then put in the new backlight and reassemble everything. lcdparts.net has some specific laptop repairs (http://www.lcdparts.net/howto/default.aspx) but for an overview: http://www.inventgeek.com/Projects/BacklightFix/overview.aspx


To check the inverter, open up the screen section of the case and remove the shielding. The inverter is a board usually near the bottom of the screen Look for any scorch marks or bulging or damaged capacitors. (Sometimes other parts will fail on this part but these can be spotted easily. Capacitors look like cylinders on a tripod.)

If you borrow (or have a) high-end multimeter (able to measure high frequencies - 50 kHz) or an oscilloscope, hold the multimeter probes a fraction of an inch apart about an inch above the board and power up the TV. If you see a 1 or an actual value, you have a good inverter. If you see a reading near 0, the board is bad or the multimeter can't resolve the frequency.

In either case, you can buy a replacement inverter for $50-150 and just do a simple swap. Disconnect all of the wires (connections are similar to molex and ribbon cables in a computer) and remove board (a few screws usually). Connect the cables to the new inverter. (If you google backlight inverter replacement, you'll find videos and text descriptions.) Note the part number on the board, including the Rev number, and order the exact one (shopjimmy.com or lcdparts.net are good starting points). Universal inverters do exist but can result in reversed controls (up to lower the brightness). Replacing individual parts on the board is cheaper but more prone to not tracking down all of the bad parts.


I hope this helps.

Cindy Wells

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Sounds like an inverter problem. If the power supply is internal replace the capacitors coming out of the voltage regulators. These are usually 1000mf and/or 470mf. If that doesn't do the trick look up the numbers on the 8-pin chips that drive the secondary transformers on the inverter to see if they are getting the right voltages.
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