Question about Vizio M420SL 42 in. HDTV
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Posted on Jan 02, 2017
I had this exact problem on my Vizio 47" HDTV. I removed the speakers and all the screws on the back cover. Took the cover off and located the fuses on the largest circuit board. The are in the upper right hand corner of the board. There are 3 of them in a row labeled LF 1.5, LF 3.0 and LF 3.0. The are white in color with copper ends. I took a volt meter and measured continuity across all fuses individually and found the LF 1.5 to be blown. The guy at the electronics store sold me a barrel 1.5A fuse and told me to soldier it across the top of the blown fuse. It took an extra set of hands but the TV works perfectly.
Posted on Jun 23, 2009
stored voltages are high no touching these circuts becuase they hold charges and alot of screws.
fualty capacitors you say after a while it stays on theres a full charge in the unit theres some type of discharging effect on the set after its off for a while. voltage goes to low or unstable after it is off for a while. your better off getting the service docs for this set if you want to diy..other wise get a tv tech to check it for you. hope this helps
Posted on Jun 25, 2009
I have had the same problem. I called vizio they told me how to reset my tv. It did not help me, However, maybe it will help you. They said turn the power off, Unplug it hold in power button for 30 seconds then plug it back in and power it back up. My white light flickered and then nothing. So I am going to end up buying a new tv all together.
Posted on Oct 23, 2009
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