KDL46W4100 no picture small white crack is visible when turned on. Crack got longer and eventually went across entire screen. People have told me the lcd is broken and it's not worth fixing - ie the part would cost as much as a new TV

Internal defect needs factory service. Module inside needs replacing and you cannot do that.

make claim on your home insurance

If it looks like a crack, it is a crack. You may not feel it because the internal screen is protected by an outer screen. Pressure of some type is usually the cause of cracked screens. This is an expensive repair.

If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
Search the site by type in the "BRAND NAME" of your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts

only solution is replacing entire screens. very expensive, try finding manufacturer on internet.

If the main PCB is not cracked too bad, it should not be expensive to repair. You have lost vertical deflection causing the flat line.There may be a crack at the flyback, where the vertical IC gets its operating voltage, or a crack at the pins of the vertical IC itself.

your screen has a small crack inside, but the screen is not used to take your pictures, so the pictures turn out fine.

A small crack, turns into a big crack, Short of ordering a new piece of glass, there is no "fix" sorry. YOu can continue to use it, but eventually it will run across the cook top, and then shatter the glass... Better be safe than sorry.

Check the glow ignitor. It is located on the bottom of the drum. You will need to remove the back panel. Then with a 5/16th wrench remove the glow ignitor look for a crack that is visible or you will see a white line all the way across one side of the glow.

Your LCD screens are cracked. Almost any significant crack will make the entire screen "go white". If you LIGHTLY press on the screen you'll probably see where the crack is (appears as a small black or multicolor line and may or may not "bleed"). You need to replace the screen (at a repair shop, mail in service, or DYI with a replacement screen) or get a new phone. Sorry.