20 Most Recent JVC AV-48WP74 48" Rear Projection HDTV-Ready Television Questions & Answers

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U have convergence board issues. Sometimes over time the solder joints on the board go bad or develop minute breaks. U might try removing the board and resoldering every thing you can get it. U can also consider baking the board in an oven at around 270 degrees for about 8 minutes to melt all of the connections on the bottom of board. Then remove, allow to cool, cross your fingers and see what happens.

you most likely need to replace the convergence ICs. If you are lucky, they may have unsoldered pin connections at the PCB, you can try re-soldering those loose pins. What usually happens is that because of the heat generated, the pins have become detached at the IC also, thus the need to replace the ICs. Some of these have either fuses or resistors to the ICs that have also opened & will need replaced also.

This means that a part is failing. Check the boards for bad connections, and bad parts. IT could be in IC that is bad too

in the source menu button select the HDMI option to recognized the source signal with HDMI output.

There are two of them that need to be replced as a set. They are both STK392-110 Convergence Ics you can get the original oem Ics from www.tvrepairworld.com they are listed under the Integrated Circuit catagory you only need the one set. They also have the convergence repair kit listed for your model under the JVC repair kits the kit has both ICs all 12 resistors and the CD with step by step repair instructions.

In the menu on the tv setup you should find a test pattern that can be displayed for converging. In that menu there may be an auto converge which is much easier. If not, with the patter up you will have to manually converge the individual guns in the tv with the back off. There are adjustment knobs or screws for focusing the guns.

Okay so the green color that you see on the screen is because the coolant inside of the green picture tube is gone bad (it suppose to be cristal clear but now it is brownish and that makes the green color run all over the screen.) That just happens over time and I'm guessing the picture tubes have never been serviced. Now you got two choices
1- The easiest and fastest way would be to take it to a local repair shop and have them service the coolants of your picture tubes. I'm guessing it would run you about $165 or so to get them done (the three of them red,green and blue)
2-On the other hand you can do it yourself. It is not hard at all but it does require a lot of attention.

After the picture tubes have been serviced you'll notice the big difference.
You'll actually have a much brighter and sharper picture just like when it was new.

Let me know if you decide you want to do it yourself so i can post the instructions for you.

If its 3D looking or warped looking its a convergence failure. This is common on all projection TV sets. This video may help.