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Vizio E500i-b1 went dark, any ideas on what to check next?

Hi, I have a Vizio E500i-b1, was bright and working fine and then just went off. Thought it might have been a power surge. There is no color or light from the TV. The power indicator light on the lower left hand side goes on when you try to power on with remote briefly then fades out, so I know power is getting to it. The panel does not light, you do NOT get the Vizio display or any other indication on the panel. The serial number is: LTY6PLKR0250037 and the main board assembly part# is: 705TXESM37400X E333660. Here are the things I've tried: 1 Removed the back panel to check for any lights when powered on, no lights visible even in dark room. 2 Flashlight test - powered on and looked for any visible sign of an image with a flashlight when powered on, none visible 3 Replaced the Main board - Got part new Main board from ShopJimmy and replaced: Part# Vizio 756XECB02K061 Main Board for E500I-B1 LTY6PLKR - After replacing, same - nothing changed. My model looks to have a Power Supply Board, Main Board but don't see a TCON board, or LED driver board might be there, but not immediately visible Do you have any thoughts on next steps? I don't think it's the LED lights, as they were very bright right before they went off, and I doubt they all would have died like that in unison. I could try a replacement Power Board next, but wanted to get some thoughts. Thanks

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Larry

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You can change boards in your TV all day and it's most likely no going to fix this set. Have you ever had a set of miniature Christmas lights that seemed to work great then all a sudden none would light, either because a bulb burned out or fell out? There are 2 types of electrical circuit wirings, one is series the other parallel. In series like your LED backlights are wired in your TV there are about 8 button lamps per circuit that have a 24 volt DC supply serving each set as this TV has what's called local dimming, one of the lamps has opened up making that set not light up, the power supply has over voltage and over current protection for each supply if one lamp opens up they all go out and this is exactly what's happened in your TV, the power supply safety circuit is non discretional, if it detects an error it shuts down the entire backlight circuit giving you no backlights. As far as a break down on what fails 5% of the times it's the main board 5% its the power board and the other 90% of no backlight failures on this model TV comes from the backlights being bad. You can change just the one bad strip if you wish but it's advised to change them all. Good luck!

Posted on Oct 27, 2021

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