Sharp 42d62u lcd 2 rectangular squares(yellow)top right corner

SOURCE: Blue horizontal and vertical lines

We have many problems with loose or poorly seated cables and connectors on these units. Pull the back and reseat all the internal cables, especially the LVDS cable to the LCD control bd. If this does not correct the problem the main cause is a bad LCD control bd. or possible a defective main bd.

SOURCE: Sharp 42" flat screen LCD T.V.

You have a bad buffer ic,which is part of the lcd panel.Definiately call sharp to get it repaired.If it doesn't have a warranty,persistence through sharp will get you results.

SOURCE: Horizontal green line appears on screen

my maxent plasma tv has the same problem but it has green and red lines. I found out that hitting the tv from the back works. It used to last a long time but now i have to get up now and then to slap the tv on back with my hands! anyone with a long term solution?

SOURCE: green vertical lines

Possibly needs a new control circuit board or lcd panel

SOURCE: Sharp Aquos LC C3242U - Intermittant Sound Switching from Mono to Stereo

Not sure if I just got lucky or if the problem is solved..I hooked up my Sharp Aquos LC-32D64U the other night and I had the blue audio box pop up. Mine was only in Mono and would not switch to Stereo...Well, Local cable company is of of Hi-Def boxes but I thought what if my Digital box is bad/old or has some sort of problem. I went down to comcast cable company switched to a different digitial box..came home, hooked it up and so far no blue audio box, plus now it shows that it's in stereo..good luck