My 40″ Samsung TV model LNT4053HX/XAA developed a problem where when first turned on it would make clicking noises and turn on and off until it finally stayed on. I lived with it for a few months but it progressively took longer and longer to fully turn on. Before I purchased a replacement I decided to search the Internet for a fix. I figured that others may have encountered the same problem. Sure enough Paul of TampaTec YouTube channel explained exactly how to fix my problem. It seems that Samsung engineers under-specified the TV’s power supply capacitors and they were swelling up and failing. I ordered the five capacitors that Paul indicated were usually the problem.
Today, I went through the significant trouble to remove the TV from its tight, cable-full under-counter nest, took out many screws and opened it up. The power supply had one, and only one, capacitor that had failed, see photo below. After scrutinizing all of the power supply capacitors I decided (fingers crossed) that the other four were OK and only replaced the obviously bad one. IT WORKED – the TV now powers up correctly and, hopefully it work for years to come. Thanks Paul of TampaTec YouTube channel.