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Vizio e420i-a0 has light but no image. Replaced mainboard and then power supply.

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  • Charles Rister
    Charles Rister Apr 25, 2017

    Tcom is built into mainboard.

  • richie46 Apr 25, 2017

    Do the flashlight test to make sure that your inverter board is good.?

  • Charles Rister
    Charles Rister Apr 25, 2017

    Did flash light no image. Have light on screen no image. Inverter built on power supply board and already try a different board.

  • richie46 Apr 25, 2017

    When you do a flash light test and have no image that is a clear indication that either the backlighting leds are not working or the t con board is fubar. But the conundrum is that you have indicated that you replaced a main board that included the t con (picture digitalization) and inverter boards (led illumination). A puzzlement.

    Are you SURE that the backlights are all working? How about the main board - was it new or a used one? - could the latter be bad? And is the PS actually putting out the necessary voltages to feed the other components?

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T con board issue.

Posted on Apr 25, 2017

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Posted on Jan 02, 2017

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http://electronicshelponline.blogspot.com/
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http://electronicshelponline.blogspot.com/
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http://electronicshelponline.blogspot.com/

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http://electronicshelponline.blogspot.com/
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Check the attached links,
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."


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http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced.

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http://electronicshelponline.blogspot.com/
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Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
Some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.

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