Okay here’s a really good video to help folks fix the power supply on a 42-inch Vizio LCD flat screen television (Model SV420XVT1a). Basically the problem becomes evident when you turn on the unit. You will see the Vizio insignia LED power indicator go up but see no images and screen will just be a complete blackout. The video gives a nice Macgyver tip on how to determine whether it’s just the backlight and/or the LCD screen that are/is out using a small flashlight.
Video teaches how you can repair the TV’s power supply module (part #0500-0405-0270) by replacing the bad components. You can of course opt to just replace the entire power supply but why do that when you can replace just a few parts, save some money and get the TV working again.
This video (which can be played in good quality HD) is intermediate level so be sure you know you can handle the safety aspects of the fix before going into it. Some soldering deftness is also needed because the components that you’ll need to work on are pretty small. You’ll need a multimeter for this repair.
Video will show you how to replace 5 problem parts: 1 pc. Field Effect Transistor (FET), 1 pc. FET driver IC and 3 resistors. Other tools you need includes a dental pick (to help you pry those tiny blown out resistors loose), some acetone and a small brush that you can use to clean the circuit boards (see video on how it’s used).
Thanks to norcal715 of Youtube for this repair video.