Horizontal lines through screen, goes away after 5 mins then returns

The fault should be with its supply voltage to video output section circuit. Check this voltage. Check the smoothing capacitor used there. The video output card stage, can be located at the back [neck] of the picture tube, will directly plugged on to it; and can be pulled back out gently. Take care. http://electronicshelponline.blogspot.com/ Check this link for more details. Pull up older posts.

try tweeking panel corner to corner.see if it changes or goes away.if so bad connection on panel,bad panel

I think its the ribbon cable is loose inside the unit on the main board but I could be wrong.

Yeah we have the same exact problem here. Defective TV....ours would correct itself after 30 mins, but now it's blurry all the time. I'm never dropping 2K on a SONY tv again.

this could be the main board or the dmd board on the light engine. you can try disconnecting, cleaning the connections with an approved board cleaner, blow the connections completely dry and then reseat the connections firmly. This has worked many times for me. If the problem still persists you will have to have the projector tested to find out what needs to be replaced.

that is an overheating problem. With the TV unpluged clean and or vacuum the internal tubes. Not the lamp though. Do not touch the lamp as any oils on your hands will cause a hot spot and the expensive lamp will fail.

This is usually due to the developer kit.
Try replacing it and see if the problem goes away.

Good luck!

Get into the TV menu and locate the H (Horizontal) and V (Vertical) picture options. . .increase the V until line at the top is gone.

REPLACE VERICAL OUTPUT IC ' LA7838

I had same problem. Tech's said the power was noisy. I cleaned up the power but the TV still did exactly as you describe. Problem will progressively get worse with longer bouts of flickering. I was under warrenty and sent the TV back. After 3 months I am still waiting for a repalcement.