Question about Vizio SV421XVT 42 in. LCD TV
I have a VIZIO SV421XVT Tv. 6 months ago or so I had an issue when I try to turn on the TV it would fail to turn on the screen properly. I could hear the audio but no picture until I turned it off and tried it again. Once I got it on it would work perfectly fine. Now I am having a problem when I am watching cable tv hook directly through the COAX jack the TV every once in a while will completely freeze. The screen will either freeze on the picture or go to a black screen and none of the buttons or remote buttons will work. I have to unplug the tv to reset it. I haven't had this problem yet when playing xbox hooked in through the HDMI slot since I have hooked cable directly into the COAX jack. I'm trying to figure out if it is an issue with the cable or an issue with the Power supply board maybe having bad capacitors. Any insight on this would be amazing! Thanks!
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Posted on Jan 02, 2017
If you are using a set top box this might be caused by turnig the box on at the same tie as you turn the tv on or slightly after you turn the tv on. If you are using compnent or HDMI inputs the set needs to see the signal as it is turned on to know what formt the signal is in.
I’m happy to help further over the phone at https://www.6ya.com/expert/dewayne_4a10eab6caecdb92
Posted on Oct 23, 2007
Thanks for using FixYa. Please check the following—
1. Is Power board output +5V?
2. Is J1 (#19 in the right diagram)connector good?
3. Is DC-DC OK, check the voltage at J1 using a multimeter.
4. Is U4 (3.3V) working ok, U4 is an IC, you’ll need an IC tester or an oscilloscope to check this IC.
After checking this if it still doesn’t work then check P3 D-sub Input (on the D-board). See this schematic for details--
Please do accept the solution if the issue is resolved or else revert for further assistance.
Posted on Oct 17, 2009
I had a similar problem after having a Vizio for 2 and a half years. I
left the room for a minute, i came back and the screen went black. I didnt hear an arcing sound though.
There was still power to the unit and you could see that the back light
was working, just no picture, no sound, and you couldn't use any of the
buttons. The only way to turn it off was to unplug it. It would then
start up, with the Vizio logo going from orange to white, and then do
the same thing all over, no pic or sound. I would check the ceramic fuse first on the board that gets power from the plug.
HOW I FIXED MINE: I ordered a new "main PCB" from tigerdirectparts.com (you can also use searspartsdirect.com). This is the circuit board with all of the inputs on it (hdmi, cable, etc.) I opened it up, disconnected the old one, put in a new one and now it works fine.I used both serial numbers on the board to search for it online. It cost me $144 to do it, but that's better than $450 for a new TV. My tv is the vx32l hdtv10a. I hope that helps.
Posted on Jan 22, 2010
SOURCE: My Vizio 42" LCD SV421XVT
U getting a non respones from ur remote or the manual side panel tv controls buttons wright.U already tries resetting it back to factory setting.But the problems still the same.Yes,the tv Tuner signal board is the causes and the problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish tv Tuner signal board for the replacement.
Posted on Dec 11, 2010
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