Was gifted a 42" Vizio LCD TV, model E421VO. Will not power on. DOA. No activity. Checked power cord, it's good. Checked remote, it's good. Here's some pics. Where to start?
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If you know how, then you need to repair the power supply or replace it with a new one (look for a donor).Attached Files -
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start with some test on PS if the 3,5,and 12v are presentComment
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At the moment there will be no voltage at the output, because the hot part of the power supply burned out (the high-voltage ceramic capacitor shorted and exploded and took with it several components (this could be a power mosfet, resistors, diodes, PWM, ...) and most likely the fuse also burned out.Comment
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So get in there and replace that cap, test everything on that circuit. If no other problems, maybe test it with a dim bulb tester or similar. if no problems then fire it up, sometimes it can be just the one component that is bad. Testing is the only way to proof it out. If your not sure whats on the circuit just trace whats connected to that cap. Saying there's more wrong without testing is just a guess. I don't do guesses.
Last edited by nomoresonys; 05-07-2025, 12:03 PM.Comment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
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I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
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