Sony grand lcd kf-42sx300u the on and off switch flashes and the tv wont turn on

Most common problem is Bad Capacitors they will be vented or puffed up on Top. 2200uf 10v 3300uf 10v 1000uf 16v

09l;0;;

ebay lamp distribution

You need to change the engine. Please take it to SONY service centre

Well we need to have in mind that a generic lamp will give you 3500 to 4500 lamp hours and the Phillips will give you 6000 to 8000 lamp hours ,The lamp itself typically uses AC current and about 15,000 volts to ignite the lamp's mercury vapor gas. The gases inside the lamp react when electricity charges up the mercury gas creating very bright light. The voltage drops to keep the flow of electricity to the lamp.
The symptom of a bad ballast is that you could hear a constant CLICKING or electrical BUZZING sound,my recomendation is to take out the lamp to physically check for any sings,(shatter fillement,black or grey spots in the fillement or smoke ) you can get good deals at http://www.discount-merchant.com/?click=52978
Please keep us posted,

Probably hte lamp. You can replace this yourself.

Have you replaced lamp in TV?

Lamp is available HERE and cost approx 175

the orange lamp is suposed to be on when the set is off but there is still power to the set
red will be on when in standby
green when set is on and working

Im afraid my friend the lamp needs replacing (model: XL-2100E), if you have a hunt on google you will be hit with the pain of the cost... like me :(