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2 types. If wooden top rail of screen surround: remove end screws of top rail by removing caps over screws on upper front sides. Remove the two screws. Remove top wooden screen bezel piece. Now pull up and out screens.
If sceen surround is plastic one-piece all-around: remove speaker grill board. Remove screws along lower front of screen bezel. Pull bottom of screen bezel out a 1/2 inch. Lift up on screen bezel to remove entire screen assembly.
If you are asking about that TV that has convergence board on lower front and it has hose type connection wires then remove screws of aluminum heat sink sheet that holds D board and convergence chips and take it off from TV front, hose type connection wires has enough length, approx 2 feet, to bring that board in front of you for soldering work.
If your TV is Sony KP-51HW40 as question shows its model then it has D board at rear, convergence chips are mounted with aluminum heat sink on D board, unplug connectors on D board but do not unlock plastic lock rings that hold hose type connection wires as that will help you to replug connectors in right connectors. remove screws on D board that holds it with plastic chassis underneath, unlock few locks on its sides and take it out. Hope that info will help you.
Remove the speaker cover on the front, it just pulls off. Pry each side a little at a time. There are 4 screws that hold the screen on. Remove them and the screen just lifts off. There are wires attached to the controls so, keep that in mind when lifting the screen.
I have posted photos of replacing my RCA DLP color wheel on snapfish, here is the link.
The key is not to go through the back, but through the front by dropping the screen. After removing the screws that hold the screen to the chassis, it pivots out allowing you to reach in, remove the light shrouds and then by unscrewing four color wheel screws and disconnecting two connector cables to pull the color wheel out.
pop off the front cove were the speakers are grab each side just under the screen were it is seperated. and it will pull right off. then their are two screws holding it in place on the bottom corners. after screws are removed the screen slides up to unhook.