@luckyfella : sorry for late replying.. i was out for few days.
thank you so much for your great advice, as you have said to do process eliminating, i have checked one by one. when i connect TV directly with PC, getting clear picture. when i add splitter and 1 meter coaxial cable, poor picture quality on TV. that means problem is of HDMI splitter ( i.e. HDMI to RCA splitter). what should i do further to resolve this problem ?
@tesc_cctvpro : HDMI splitter is local make