Question about JVC AV-48WP30 48" Rear Projection Television

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JVC 48 inch rear projection tv with 2 spot in center of screen. one is blue/green the other is yellow. ther are stationary and appear only when the tv is on. Looks like someone used crayons on the screen but disapear when tv turned off. any thoughts?

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  • JVC Master
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Yes, I know what is wrong and there is a simple way for you to confirm this.

Have you ever seen a TV with just a white line across the screen from left to right? On a regular TV if this happens and you leave it on long enough it will burn the mark into the screen.

I suspect what you have is two of the picture tubes in this projection TV have a burn--it is caused because the set lost either horizontal or vertical sweep--picture either closed from left/right or top to bottom for a moment and then came back on instantly---burns a mark in one or more of the 3 tubes screens.

Way to confirm is simple--with the back cover removed cover each lens one at a time with the set turned on--be very careful when you do this not to touch anything else---

if you cover a lens and one of the marks goes away that tube is burnt----my guess is you are going to find at least 2 of the 3 tubes are burnt on the screen---

Problem here is the tube or tubes need to be replaced to correct this AND whatever caused this HAS TO BE FOUND ALSO OR IT WILL DO THE SAME THING TO THE NEW TUBES--


CONSIDERING the cost of two or more replacement tubes you are most likely better to buy a new TV---I have seen about 100 sets with just exactly what your are describing---It does not happen a lot--but once it happens the damage is permanent.

I know I am not giving you good news but I am sure from your description this is what has happened.


Sorry to give you bad news---see for yourself if you cover each lens one at a time--if you do this and the marks are gone you know exactly what has happened.

IF YOU HAVE ANY QUESTIONS OR NEED MORE INFORMATION--let me know here--I am here to help but cannot always give good news.

SD TECH

Posted on Oct 07, 2009

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