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Old 06-09-2021, 05:47 PM   #1
ChillingCicada
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Default Vizio VO42L Issues: Need Guidance

We've had our Vizio VO42L since before 2010, and it's worked flawlessly this entire time. However, just recently it started emitting a high-pitched buzzing/humming sound. I followed the basic troubleshooting tips of just unplugging it for a moment, and even holding down the power button while doing so, all to no avail.

Furthermore, after I attempted these basic steps and powered the TV back on it would always begin visually flickering while the sound stuttered. After a few moments of being turned on this would go away, but it still periodically comes back.

I also disconnected every device from the TV, but it didn't have any apparent affect upon the problem whatsoever.

I've just ordered a new power cord, because Vizio claims this could be the problem, but I obviously have my doubts as to whether or not this will solve the issue at hand.

Meanwhile, I've also taken the back off of the TV after unplugging it, and currently have it set aside for further troubleshooting. My biggest question at the moment is what the most likely culprit is, and/or is there anything else I can do right now in order to isolate the issue here?

I've taken photos of the main board and power board, which I've also noted the model numbers of, but I'm hoping that I can be guided in the proper direction before I potentially start ordering a bunch of unnecessary parts.

Thank you.
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Old 06-10-2021, 06:39 AM   #2
dick_barton
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Default Re: Vizio VO42L Issues: Need Guidance

If you could post your photo's of the boards they may help.
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Old 06-10-2021, 08:32 PM   #3
ChillingCicada
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Default Re: Vizio VO42L Issues: Need Guidance

I've attached some photos of the boards from a few different angles. The only backplate I haven't removed so far is the one covering the board on the far left-hand side of the TV. If anymore details are needed, just let me know. Thanks.
Attached Images
File Type: jpg IMG_2598.jpg (525.0 KB, 8 views)
File Type: jpg IMG_2613.jpg (467.6 KB, 5 views)
File Type: jpg IMG_2602.jpg (629.3 KB, 8 views)
File Type: jpg IMG_2604.jpg (602.0 KB, 6 views)
File Type: jpg IMG_2617.jpg (766.7 KB, 4 views)
File Type: jpg IMG_2620.jpg (541.0 KB, 5 views)
File Type: jpg IMG_2626.jpg (663.2 KB, 3 views)
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Old 06-11-2021, 06:09 AM   #4
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Default Re: Vizio VO42L Issues: Need Guidance

The power supply could do with a good dusting. I would check all the solder joints on the underside of the power supply especially around transformer joints. The coils at the output also may also have run hot so I would check the solder joints on them too.
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Old 06-11-2021, 10:29 PM   #5
ChillingCicada
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Default Re: Vizio VO42L Issues: Need Guidance

I do admit that it had some dust, lol, although I was surprised at how little there was inside the set compared to some other devices I've opened up, especially at a decade plus in age.

I just gave it a dusting as you mentioned, and I took some photos of the underside. Everything looks okay to my eyes, but I'm including another photo so you can take a look.

I also have a video clip of the issue from just now, hopefully this will also prove useful:
https://drive.google.com/file/d/1Iui...ew?usp=sharing
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File Type: jpg IMG_2634.jpg (719.7 KB, 8 views)
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Old 06-12-2021, 04:22 AM   #6
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Default Re: Vizio VO42L Issues: Need Guidance

J7 link doesn't look so good. Also D604 appears to have some residue around it.
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Old 06-12-2021, 08:02 AM   #7
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Default Re: Vizio VO42L Issues: Need Guidance

It may well be worth reading the comments by Budm on the following page
https://www.badcaps.net/forum/showth...ight=dps-260hp
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Old Yesterday, 10:03 PM   #8
ChillingCicada
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Default Re: Vizio VO42L Issues: Need Guidance

Quote:
Originally Posted by dick_barton View Post
It may well be worth reading the comments by Budm on the following page
https://www.badcaps.net/forum/showth...ight=dps-260hp
I really appreciate the advice you've given me.

I ended up replacing the power board since I found a great deal on one, and so far the flickering is completely gone. There remains the slightest buzzing sound, along with some undulation in that sound, at least when I'm listening to the exposed board right there in front of me, but the sound appears to have lessened even more so as I've left the TV turned on for a few minutes. I've attached a video so you can double-check it for me before I reassemble the entire set and place it back on the stand.

I may just be somewhat jumpy of any sounds emanating from the boards given what just occurred, so I'd prefer a second set of ears letting me know if all sounds well.

Thanks.

https://drive.google.com/file/d/1zPc...ew?usp=sharing
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Old Today, 03:45 AM   #9
dick_barton
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Default Re: Vizio VO42L Issues: Need Guidance

If it is a used power supply then I would check the the underside of the board to ensure all the solder joints especially on the larger components are well soldered.
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