Th 42pe50b the tv powers up has sound but the screen has horizontal black grey and white lines across screen

SOURCE: Horizontal grey lines on TV

Sound like you have to turn down the G2 (screen)controls. They are turned up too high.

SOURCE: Phillips/Magnavox 9P5544C102 white raster and shuts down

This denotes a problem called blooming the horizontal lines you see are called retrace lines this is caused by the increase in anode voltage which could be caused by an increase in HV section current which trips the overcurrent protection dircuit and turns the TV off.If you do not have electronics experience I would suggest taking the set to a TV repair shop.

SOURCE: Strong red tint with horizontal lines across screen

if you have warrenty, return it. if not, then buya new one...the video fuses are dying...hard to fix it.

SOURCE: Samsung HLS 5679W LED DLP TV Horizontal white lines jagged across screen.

What you are sseing is a convergence problem within the light engine of the set. This is not repairable in teh field other than replacing the light engine part. Since this unit is less than one year old, it should be covered under warranty. From the looks of it, one of the LCD panels has shifted internally. Call for warranty service and indicate that the light engine has a problem. With luck, the service company will show up with the part in hand. Replacement should not take more than an hour or so.

Dan

SOURCE: Many thin black horizontal lines on my Hitachi Ultravision 50" TV

Good Day, LDS also;
You may have a poor seated cable connector. Unplug TV from A/C, remove back look for a large black connector. It connects between the Main Digital Module and the Drive PWB. Re-insert both ends several times to make better contact, use contact cleaner if have but not always needed. Good Luck, big IRISH.