Question about JVC AV-65WP74 Rear Projection Television

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Video Inputs not working

I just changed out the convergance mods, once I have the board back in, had a great pic but no sound. In getting the sound back up, all of a sudden, the video inputs, all 4 do not work now. It was working fine initially. Is there a specific wire/board/chip which all inputs lead into? The three in the back and the one in the front? Is it maybe a setting on the menu feature of the remote? Thanks for any help you can provide.

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  • JVC Master
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Did you have the back of the tv open while the poer plug was plugged into the wall? If so the set will need some serious repairs as that model has a safety feature where if the back cover is removed without removing the plug from the wall it wipes out all the digital and video circuits. You have to defeat the safety feature before removing the back panel, and if you plug it in even for a second with the back removed the damage is done.

Posted on May 28, 2008

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Mistubishi Convergence/video display problem


The most likely cause is shorted convergence chips and possibly a few pico fuses.

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 a convergenece repair kit with instructions from the links below.

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

Problem #1) Convergence

Yours may have one or more of the following symptoms...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

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

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

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

You can see some more examples and find a fix herebb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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1 Answer

Mistubishi Convergence/video display problem


also check resistor values on the chips and resolder the tuner as this can cause problems as they heat up , then replace any electrolitic capacitors in the video circuts selector ic
i will be back to see what you get

electech

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1 Answer

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Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projeciton sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some photos of convergence problems.

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Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move RED and BLUE in all directions - up, down, left, and right. And you should be able to get the grid straight.

If you can't move them in all directions or cant move them far enough your convergence chips are bad and should be replaced. This is a common problem.

Note: If you TV has as flash focus or magic focus button only try pressing the button. If it fails to fix the convergence your need to fix it. See below for a fix

69189a5.pngCONVERGENCE SOLUTION

You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
This is a a fairly easy DIY job if you are handy and can follow directions. You can get complete repair kits from TvRepairKits.com or click here. They have put together DIY repair kits that include the OEM parts and step by step photo instructions for each repair. If you are not handy or can't follow directions we would suggest calling a shop.

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1 Answer

Hitachi 57f710s


Sounds like a video board problem. May also be the convergence board. You might get some freeze spray ( a component cooler that comes in a spray can ) and while the set is on, spray the boards and see if the problem temperarly corrects. This is to isolate the problem. Once the problem is isolated, you can change the bad component. Good Luck
Ed
NC Electronic
Mills, Wyoming

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1 Answer

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You may have shifted the input board a little while replaceing the IC's. Double check every plug and connector, not just by visuale inspection, but by going and removing and replacing every connector. I have had problems like this in the pasy and have learned the hard way, everything is not as it looks. Good Luck

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