Tv picture HAVING PIXEL PROBLEMS WITH MY TOSHIBA 40XF355DB MODEL. DARK COLOURS VERY BAD REALLY SEE THE SQUARES.......MID TO LIGHT BROWNS VERY BAD TOO...but not on every programs

Sounds like the DLP chip has failed. You can get replacement parts here: TV Parts Universal TV Stands DLP Chips ShopJimmy

U can't do any grid lines adjustments for this problems,the tv problems it is having are known as a convergence pictures problems,it is dead.The tv have any colors lines like R,G,B mis alignments,tv have any colors shadows pictures or have a 3D pictures look alike?Yes,than the tv convergence board it is dead for the tv to causes all of these convergence pictures problems.The tv convergence board must have to be repair like replacing 2 STK convergence ICS and some or all of it resistors too.To fixed the tv convergence board to solved the tv convergence pictures problems.The tvs shops will cost like $300-350 for parts and labors.

Go in ur tv menu go "Picture"go down to reset.Press it,will go back to Factory setting.The colors should be back to factory setting.Not,than ur tv Main Tuner signal board is the cause must change to fix.

maybe or maybe not. It is a pixel that is stuck 'on' all the time. Not a warranty claim item as a few bad pixels are allowed.....

It does not spread, but that is not to say that another pixel somewhere else on the screen will not go bad.

Same Problem Here on different Toshiba Model. Did you get it fixed?

Your convergence ICs could be going Bad if so TV will shut down if the one that starts it goes out first STKs big black ICs also 2 resistors l;ow ohm 2.7 ohms near ICs.

i had the same problem! i just changed my scart leads to some quality gold ones, this made the picture a lot crisper . hope this helps :0)

Color Picture Tube get effected with Magnetic waves, please check and remove any thing having magnet inside like speaker etc near your tv.

loretta change your power pack
entwined  try another cable

The light engine bulb might be bad or going bad. Check it first. Then check its power source. These are you two most likely problems. I would suggest you having a TV technician perform this task.

I hope this helps,

Thank you,

Shuttle83