This is my first time on this site and I apologize up front if I am going about this the wrong way. I don't post on forums much at all. I read some posts regarding the similar problems they were having and have quickly ascertained I may be in over my head. I have a Vizio VT420M LCD tv that has no sound or picture. The Vizio lights up, but nothing else. The screen stays black. I am able to turn the tv on/off with the remote or power button. I took the back off the tv and there are three boards. One on the left is the power supply and the one on the right, where the hdmi and other plugins are, is the main board. At the top of the back of the tv, in the middle, is a smaller board with a metal cover over it. I think this is the LCD Controller? Anyway, I would like to replace one of these boards and a couple of posts I have read on other forums said they replaced the inverter and that took care of their problem, which was identical to mine. Is the LCD Controller the same as the inverter? That is where I would like to start. Any help, or suggestions would be greatly appreciated. This tv was given to me, so I am money a head anyway.Do my symptoms point to any one thing in particular?
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Re: Vizio VT420M - No picture/No sound
It's been said many times, One picture is worth a thousand words.
While it is possible that the inverter is bad, typically you will still have sound with a bad inverter. The inverter is NOT the LCD controller.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic. -
Re: Vizio VT420M - No picture/No sound
You say the Vizio logo lights up as in changes state when turned on
Nothing else works?
I've seen that symptom on at least three or four Vizio repairs during the past several months
Typically it's been a SMD three terminal 3.3Vdc regulator on the board - <$3.00 for the part
Might want to look at the many AMC1117 regulatorsComment
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