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No power and chirping noise when power is plugged in

I was watching my Vizio M50-C1 television when then screen went black (no back-light), and a chirping / clicking noise was heard. the TV would not respond to the power button on the remote or on the back of the TV. When the TV was removed from power, the noise stopped.

I tested the outlet with other devices, those worked fine. Next, I opened the back panel of the TV, and tried to identify the location where the sound originated. The sound appears to be coming from the same board that the power is plugged into, but on the opposite side (red circle is area where sound is).

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There does not appear to be any damaged components - capacitors do not look bulged or leaking. what would be the best way to find / replace any defective component?

Thank you in advance!

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Hi Brian. I'm having the same chirping issue in the same spot on the power board on my Vizio M49-C1. I was watching TV and then suddenly the TV powered off and the chirping started. I was thinking about replacing my power board as well until I came across your post.

I'm curious, did you ever find a solution for this? Or did you just buy a new TV?

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So I replaced the power board today but just like Brian I still had the same issue. The issue seems to stop when I disconnect the cable connected to the main board but then resumes again when I plug the main board back in again. I'm going to try replacing the main board next and I'll let everyone know if that solves it.

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changing the main board fixed it!

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Does the main board just plug in? Or do you need special tools to change it?

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sorry it's been awhile... but if I remember correctly a screw driver is all you need. No special tools. BTW my TV is still working fine since I fixed it about 2 years ago. :-)

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Great news! I had the same exact problem as Brian, but replacing the main board has solved my issue. The TV is back working again. Even though the chirping sound is coming from power board the problem is actually on the main board. So if you have this problem don't bother changing the power board until you've changed the main board first. I hope this helps. Good luck!

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after replacing the boards, did you have to do anything except plug tv and go?

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I replaced mine and now it's in demo mode and my remote doesn't work with it. Can't get it out of that mode...

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@Candie Barton @krerdman1 I basically plugged in and it worked. The TV had to download a bunch of updates but that was it. I can't remember if I had issues with the remote, I don't think so.

Just an update... it's July 2021, I use the TV everyday and it's still working. But it's probably time to upgrade soon. The Youtube app is slooooooow

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What is happening is there is a shorted diode or transistor that is loading down the SMPS (switch mode power supply). You can take an ohm meter and check the components around the area where you hear the chirping sound for a short. That means there is zero, or close to zero, ohms of resistance.

I don't want to discourage you because sometimes these problems can be cured with one component needing replacement at a cost of under five dollars. However there are usually some components associated with the circuit in question on the reverse side of the power board that are surface mounted. These are trickier to test and replace than ones with leads on them. Additionally one component may be what is termed "leaky" and may not show as defective under a static test but may in fact be the cause of other component failure. So even though you find the "bad" part and replace it, it may last a few days or so and fail again.

One good resource is shopjimmy.com. For some power boards they have kits for 20 or 30 dollars and you simply ( hopefully simply) replace the components and see if it cures the problem. You can find out by entering your model number on their website and look for the kit in the parts listed.

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Thanks for the Reply!

I did end up getting a new power board from shopjimmy and put it in yesterday - once the new board was in, the issue continued. There is still the same noise when the power is attached..

Any thoughts?

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Thanks for the input, I experienced basically the same thing on my Vizio E series that is 3 years old. I heard a pop and then the TV shut down. After reviewing comments about the same problem on this forum, the fix recommended seems to be replacing the main board. However, my question is, since this seems to be planned obsolescence, what is the point in replacing a major component and then risk replacing other components later, probably sooner than expected? Is it worthy of beating a dead horse, other than the tech challenge of correcting a failed infrastructure? The industry seems to be bent on this strategy of replacing a major investment in TV tech within 3 years of purchase. Why fight it? Isn't it better to just get a new TV with all of the major enhancements that the rapid advance of technology has to offer? If the conclusion is to the contrary, then we'd still be watching black and white TV. Just saying.

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I tend to repair them and use them longer,like many people we cant afford top of the line TVs every 3 years. But I can fix a broken 2 year old setup with all the bells and whistles using certified tested used parts for much cheaper expense.

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Amen .....Jeff Gaddie

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