Question about JVC HD-56G786 56" Rear Projection HDTV

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Line on my 56g786

Hello, I am have this vertical line going across the entire height of my jvc 56g786 dila TV. It looks like its about 2 pixels wide. Does anyone know what is wrong with it? Do I need to get the light engine replaced? thanks, Terence

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Can you see lines over your menus? if so, replace light engine.

Posted on Jul 11, 2007


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Posted on Jan 02, 2017


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So I have a 50 Lg ( LG 50LN5700). There is still a picture however about every 3 seconds it goes from regular to blurry and repeats. There seem to be about 3 black lines across the top horizontally about 3...

To clarify, are the 3 black lines horizontal (left to right across entire width of screen)? or are the 3 black lines vertical (top to bottom across entire height of screen)?

Horizontal lines are almost always the result of a failed panel, and no board replacement will fix the issue.

Vertical lines such as you have described (only 3) are probably also a bad panel. If the black lines were evenly spaced in a repeating pattern, it could be a mainboard or TCONN board.

Has this panel been cracked? or perhaps cleaned recently with too much water or cleaning solvent that has gotten the screen wet?

You may have to sell the TV for parts.

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Sounds like vertical height problem. Check and replace all the electrolytic capacitors [5 or 6 of it]; at its vertical scan output section circuit. Replace all of it at one time. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.

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Some of these had problems where the micro for the Dlp gets confused, they have a jig to connect the set to a computer and download two updates on sd cards---it may or may not cure this but this is a shop repair.

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Get a competent Technician to have a look.

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My 3 year warranty with Circuit City expires in Nov 2008.. so I hope I'm covered.. can't call until the morning.

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The faint white lines at the top of the screen is the warning that the pump-up capacitor in the vertical output circuit is going bad and the output itself is about to short out. When the TV stops working, the vertical output IC has finally shorted out. Replacing the vertical output IC, the pump-up capacitor and possibly a small value resistor next to the flyback (B+ for the v-out) should bring the set back to life.

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Here is a picture of my TV problem, the green horizontal line is from the camera flash. thanks for the help.4d2ca33.jpg

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Top of screen is stretched

There are capacitors in the vertical circuit that can cause this problem. You may be able to find these capacitors by using a hair dryer pointed to the suspected bad cap and then when the problem happens you can spry a little cooling spray on it to see if the problem clears up. The vertical output IC could be going bad but this can be checked the same way. if you have no TV solid state repair experience, play it safe and take this set into a local repair depot. Good Luck

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