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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Re: line on my 56g786

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

Posted on Jul 11, 2007

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I have a 27 inch panasonic and have about 19 real thin lines across the top of the screen. It is in the top 4 inches of the picture tube.Model CT-2701G Built 9/03

Scan coils (field) measure about 5 to 15 Ohms from the plug where they connect to the main PCB
Look for the cables that come down from the scan coils (deflection yoke) to the main pcb
its either two cables and two plugs or a 4way cable with one plug to the main pcb
2 of the wires goto the vertical(height) and 2 to the width
try to work it out which (the fattest wire is width)
The width ones go towards the loptx(line output/flyback transformer),
and the height ones go to the field output chip (or transistor pair) Follow the printed circuit from the plug and look for a 7 or 9 pin chip on a cooling plate(heat sink for the posh),
it should have a diode connected to it and about 25v on both ends of the diode.

Jul 14, 2008 | Projection Televisions

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JVC HD-56G786 Green Vertical Lines

am thank if you see it in your menu..and on ever have a bad dmd bord or dmd chip

Dec 24, 2013 | Projection Televisions

1 Answer

We have a 56 inch JVC HD-56G786 backlit projector TV and the screen just completely pixelated while watching cable. I turned it off and back on and now even it has a green screen with staticy vertical...

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.

Aug 29, 2012 | JVC HD-56G786 56" Rear Projection HDTV

1 Answer

I have a JVC-HD projection TV model 56G786 and all of a sudden it will not power on. When you try to turn it on the blue light on the power button goes on but after a few seconds it starts flashing and...


The JVC 56G786 users manual will not give you a clear or specific answer about confirming bulb failure with the LED lamp or power indicators located on the front of the TV.

If the TV was operating normally for an extended period of time (months or years) and will not start, the problem is almost always bulb failure. If the "Lamp Replacement" warning previously appeared "On-Screen" and the TV will not start, bulb has failed.

The first step in a "no picture" situation with a JVC LCD Rear Projection TV is bulb replacement. There is no way to measure the bulb. Sometimes the bulb is visibly broken or damaged when it fails. Remove the lamp cage and have a look.

The JVC Lamp Gallery has all the JVC models and lamp numbers listed. There is also a link to DIY JVC bulb and lamp installation.

If a good bulb is installed correctly and the TV still does not start, you need a technician. There are no user serviceable parts other than the bulb. Failure of ballasts, power supply boards or controller boards is rare in these TVs.


May 05, 2011 | JVC HD-56G786 56" Rear Projection HDTV

2 Answers

Vertical lines

hi there.. try this link they talk more about this problem and there is a picture lets see if your problem is similar to the one on web

your image is like this one?


Mar 05, 2010 | Mitsubishi WD-52327 52" Rear Projection...

2 Answers

HDMI broken on JVC HD-56G786 TV

have you ever went thru your hdmi setup procedure that jvc recommends?

Sep 07, 2009 | JVC HD-56G786 56" Rear Projection HDTV

1 Answer

Vertical jitters on picture - JVC AV48P776

What you are experiancing is loss of High voltage. The line is called a retrace line. It is usally caused by failure of the flyback circuit or aging of the TV tube. This is the single most common failure with CRT based display systems. The high voltage can be tweaked up, to accomidate for the age of the tube. Its a short term solution. Because of the high voltage nature of this circuit, suggest a professional repair.

Jun 29, 2009 | JVC AV48P777 Television

1 Answer

Closed caption

Here is the manual for your tv. On page 51 it will tell you how to turn on and off the CC.

Good Luck and Please Rate FixYa!

Mar 05, 2009 | JVC HD-56G786 56" Rear Projection HDTV

2 Answers

Vertical color lines

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

Jan 15, 2008 | JVC AV-48WP30 48" Rear Projection...

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