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Vizio E420i-AO black screen.

I have a 42" Vizio E420i-AO that stopped working about a year ago. If I remember correctly, it happened over the space of a few days. The picture started going black, but the sound was still on. Turning it off and on would restore the picture. It got worse and worse and eventually the picture would not come on at all. I decided recently to try to fix it. After watching the videos, I took the back off and started looking around. The unit powers up and I do get faint images on the screen using the flashlight test. I have no sound, but I don't have anything hooked up to the tv. Nothing was obviously bad on the boards, so I took some voltage readings on the led 1+ and led 2+ pins. With the power on and the connector plugged in, I get 70.2 and 70.1 vdc. With the power on and the connector unplugged, I get 70.0 and 69.9 vdc. What is my next step? Thank you in advance for any help.

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  • Contributor
  • 15 Answers

Looks like your screen backlights are not working. Check for faulty electrolytic capacitors on the power board and the backlight drive board. You may have to change the backlight drive board.

Posted on Aug 17, 2019

  • 1 more comment 
  • Randal Mercer Aug 17, 2019

    So you think its a problem with the board and not the backlights?

  • Randal Mercer Aug 17, 2019

    The led driver is built in to the power board isn't it?Last night I also did voltage checks on the 12 pin connector going to the main board. The readings were all ok.

  • Gerald Gutteridge
    Gerald Gutteridge Sep 11, 2019

    If the voltages are correct it may be the screen

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4 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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olga8004
  • 7 Answers

SOURCE: No back-light on LG LED TV

That means dead transformer supply chain. Replacing search not possible, donor Yes

Posted on Aug 08, 2016

AJIN G
  • 6694 Answers

SOURCE: I have LG 42LN5300 which is reading 230VDC at led + plug and no back lights. All other voltages going to main board are OK, I changed main board because of flickering on and off screen, so is it MB

Back - light problem. 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://electro-medical.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. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Posted on Jan 20, 2017

Testimonial: "I ordered and replaced inverter board, no change, picture is still dim pulsating while everything else works. Power board is separate on this model, so anyone know why voltage is 230VDC at LED+ point when it says on board it should be 157VDC for 42 inch, could it be the MAP3202 IC which causes higher voltage, or another component?"

  • 2794 Answers

SOURCE: I have an LG 42 TV that powers up and only shows black screen.

Chances are you have some open LED's, if one opens the entire strip will go out as they are wired in series and the power supply is shutting down the LED circuitry due to improper current or voltage

Posted on Nov 15, 2017

Testimonial: "Thanks Larry, I didn't want to get into replacing LEDs since it's considerable work and not the cheapest parts to replace. I was hoping for a less expensive and time consuming option."

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