I'm sorry to hear that you're having this problem.
I checked, but I didn't see any firmware update on the Samsung's U.S. website. Where did you find the file you're referring to? Can you provide a link? It may not be the correct firmware, and would not install as a result.
I have been experiencing HDMI drop outs since I have purchased my tv 3 years ago. I thought it was issue with my cable box, but alas it is my freaking Samsung. Thanks to this forum, I have tried to update my firmware. After putting my usb thumbdrive into the tv usb port, going through the menus etc, the tv says that no file can be found to update the firmware. I am extremely frustrated and am posting this as a last ditch effort. If I can't get it fixed I am simply going to throw my remote through the tv and buy an LG.
Model # LN-T4042HX/XAA
I have tried using the firmware update on Samsung's website, firmware name: T-SC40AUSC.zip. I unzipped it to the thumbdrive as instructed in the pdf file and got no results. Am I using an incorrect update?
My tv is also making the capacitor clicking noise. If I can't fix one of these two problems then I am going to get my sledge hammer.