After all searching I got two solutions…..
1 Purchase same make and model number DEAD TV ( main board not working ) and replace the panel ..this is very low cost solution
2. All TV’s panel have details of below at backside of panel when you open back cover of TV( sticker pasted on panel)
a. Panel make
b. Panel type
c. Panel number
These all new panels are available in china searching by “Panel Number” and you have to import it by importers of your country.
Panels are available by '''Panel model Number''' only not by TV make and model numbers
ex : Sony KD-49x700d used panel is “Lc490eqy-sja3 or syv4951”
you have to search as Lc490eqy-sja3 or syv4951 not Sony KD49X700D panel.
This solution is expensive as 1 panel cost 2. import charges 3. taxes
so good luck….