Re: Vizio VF550M screen flicker (to black) then eventual shutdown

I got my new power supply board in the mail today. It looks like that was indeed the culprit in this case. It appears to me that the problem was in the main transformer... on the dying one you could hear arcing coming from the transformer. Not sure if that was the only problem with the board, but that's the one that seems most likely to me.

They jury is still out on whether this fix is truly done, but it has been working great for the last few hours, event with 100% backlight.

Agent24,...

Re: Vizio VF550M screen flicker (to black) then eventual shutdown

So I'm thinking (and hoping) more and more that this is going to be a power supply issue... but in case it's not, I was looking into alternative solutions, i.e. if some of the CCFL bulbs are toast or partly toast. I am putting this information here for information/documentation only. I called this place in Nebraska ((402) 330-2222), [URL="http://www.ccflwarehouse.com/lacclaforlcd.html"]http://www.ccflwarehouse.com/lacclaforlcd.html[/URL] in hopes that they could help out with a few of my questions. They...

Re: Vizio VF550M screen flicker (to black) then eventual shutdown

Okay, here are some pictures of all the boards. I didn't notice anything terribly out of the ordinary... but maybe some better trained eyes can see... The new power supply and invertor boards are not yet in, so I haven't really tested anything else other than listening during the flicker a little bit. There was quite a hum coming from the invertor boards, and the large transformer in the middle of the power supply board (near the top) sounded like it was arcing inside... it had a sort of high frequency spark sound;...

Re: Vizio VF550M screen flicker (to black) then eventual shutdown

I lose sound in the same moments that I lose picture during flickering. Then, with enough flickering, the whole thing goes into a shutdown state and doesn't come back on until I cycle the power.

Re: Vizio VF550M screen flicker (to black) then eventual shutdown

From what I read on other posts, the only thing that makes me think it may not be related only to the backlight is that when the backlight cuts out, it takes the sound with it. Maybe that's normal, I really don't know. Maybe it draws too much current from the power supply board and somehow that also shuts down the sound. But if it is a bad lamp, can you even buy new ones? I know most people have said at that point you may as well throw out the TV... I'm willing to be adventurous here if the cost for a new lamp is...

Re: Need some expert advice

If it ain't broke, don't fix it! That's my two cents!

Hello all,

I recently found this forum and I look forward to drawing on your expertise in fixing this problem I am having! Recently my neighbor gave us his broken TV because it was flickering and he had already upgraded to a new one. He said if I could fix it it's mine. Now we are upgrading from another freebie: a 20" CRT monstrosity (I think it weighs at least as much as this 55"), so this is a pretty major upgrade for us if it works.

A little background on me: I like to tinker and fix things; I've been building and fixing my own computers since I was a...

Re: LCD TV turns off randomly


If you have a shutdown preceded by screen flicker is that telling of a particular board that may be going bad? I will start a new thread on my issue with a Vizio VF550M as soon as I get access. Just found this forum and it's great!...

Re: New Members - please post your introductions here

Hi, my name is Ryan. I am a sort of jack of all trades. My Dad passed on the bug to fix things rather than replace them even when it makes no... sense... whatsoever

I am a PhD student of mechanical engineering, but with a long line of electrical engineers in the family, I have always liked tinkering with electronics. I am one of the few in my area of expertise who can design and build simple and inexpensive circuit boards to solve the problem at hand rather than resorting to expensive industry solutions......