Hi,
I'm also fed with this LNB failing problem. Tatasky has changed 2 LNB this year on my dish - in March & June - still I keep getting 'no signal' error. Mine is not in warranty, I paid Rs. 100 for replacement LNB+ Rs. 170 visit charges each time. Tatasky customer care is a headache.
I've seen plastic bottles (top nozzle part cut) to cover up LNB on some dishes, does it help?