Question about JVC HD-70G886 70" Rear Projection HDTV

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Green and Red (thin lines) across entire screen [JVC 70 G886 HD TV]. Screen went to all green (wide and thin) within 1/2 hour and picture hasn't come back. "Input selection" box is visible and clear without any vibration; TV has sound. Screen went green only after I scrolled through the 'input menu' and returned to the prime cable input. I just changed the bulb yesterday. There is also a faint very high pitched sound coming from the TV...or surge protector (even when the TV is 'off'. Please help...I love this TV...even if it is bulky.

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  • 195 Answers

Try a "hard reset" first by unplugging the set for 30 seconds. and if no help, you may have a problem with the SMPS power supply, it might have a bad capacitor or two by now. Worth repair if engine is good compared to a flat panel.

Posted on May 08, 2014

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6ya6ya
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Posted on Jan 02, 2017

ctf1800
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SOURCE: JVC Model No. HD-61Z456 Screen is completely Green

Sounds like the green tube is shot, tap on the green board see if theres a loose connection, with something hard plastic

Posted on Jan 31, 2008

  • 556 Answers

SOURCE: no red when hooking up component cable for dlp hd

Check the red cable this is where the red comes from, you may have a bad cable, maybe use the blue or green one just to see if the red will come through, it can be the cable box or the tv or the cable itself.

Posted on Nov 03, 2009

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1 Answer

Picture went black except for partial green and blue lines &2 thin red lines


Vertical scan section circuit fault. Check and replace damaged component/s at its vertical scan output section circuit. If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/

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Do yourself a favor and dump this old TV, new ones are much better and cost is very low due to low demand.

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the problem is vertical collapse,i am not so sure you can trouble shoot this on your own but you can send the board to eithor pts electronics or tristate module for repair
to get a price get the number off the sticker--left hand board(looking from the back) it will start CTC195---- write down entire number before you call them

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1 Answer

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Projection TV sets have two very common problems listed below.

Problem #1) Convergence


These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.

Here are some of the most common problems with these sets...

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Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

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bb0cf99.pngYou can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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The lines you saw, i;m sure they are the ones called retrace lines but know the failure could be located on the red CRT board. Most likely the video amplifier is defective and not necessarily the CRT.
What is the model number of your TV?

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1 Answer

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Yes the red tube is shorted. I will post a link to the site where I work as they have an entire AV48WP30 with a bad tuner they are selling parts off of including the Tubes. they also provide free info on how to switch out the tubes as a unit which is a fairly easy job. Heres the link.

http://servicemanuals.vstore.ca/

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1 Answer

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you have a shorted green CRT that is affecting the other crts the short is internat to the crt that leaves what is called retrace lines. if the set is more than three years old then replace all three guns.

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1 Answer

JVC Model No. HD-61Z456 Screen is completely Green


Sounds like the green tube is shot, tap on the green board see if theres a loose connection, with something hard plastic

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2 Answers

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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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