There are green lines that come and go on my TV. Sometimes they are isolated to covering certain colors and other times are all over the screen. Then, sometimes the picture looks perfect. Any suggestions as to what could be causng this?
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Check ur owner manual or call Philip support Tech. ask it this tv model have a colors wheel design into it tv.Not sure for a Philip model tv 50" DLP tv,but the Samsung model 50" DLP tv this problems alway causes by a dying colors wheel that design into it tv.Which the colors wheel it is warp worn out and spinning off of it motor mount axis to cause grinding noises and tv colors to mess up and flashes or have flashes Black & White within it picture.
This tv have a colors wheel design in it.The tv make loud grinding motor noises or pictures flashes or freeze and pictures turn in black&white with sound.The tv colors wheel it is dying or worn out already.Don't tries to change the tv colors wheel ur self.If u don't any mechanical skills,because the colors wheel it sit way back of the tv,must take out many mechanical parts before even can come to the tv colors wheel itself to replace it.Best to hire a tv tech. to change the colors wheel,so no problems for tv funstions for later or damages more parts on the tv set,if u install the new colors wheel in the tv wrong way.
This could be your video board going bad where your input cables are connected --OR-- the color wheel going bad. Hard to tell without a photo or reference though. Try swapping the cables first... and listen for any winding or whirring sounds.