I have a onida ultra slim 200 color TV. It's sound is there but no picture is there. please suggest me something to how to repair it.The screen is in black color and some alphabet like "PW" in bottom left corner appear when TV is ON ; "PW "disappear when "RECALL" button is pressed.
When "DISPLAY + OK" button is pressed "DW" appear in bottom left corner
please reply as soon as possible.
Thank you.

Most modern tvs are not " repaired ",new control panels are replaced. You may find a new TV costs less than a service call and parts. If The TV is more then 5 years old, replacement is the best way to go.

It is only 20 month old but out of warranty

As ma said, there are no "user" serviceable parts... so it's not likely that it
Could be repaired...

Can anybody provide me the circuit diagram of onida ultra slim 200

Have you tried Google?