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So my Vizio TV was flashing on & off rapidly every time I switched it on. I would have to give it a smack at the back to get it to stop. I know it's not a good way to get something to work, but it got things working until I had time to repair it. After some Goggleing it was clear it was most probley some capacitor that where damaged. After opening it i found 4 caps on 2 of the circuit boards blown. I replaced them and now it works great. 

1. VIZIO Model  VW42L  HDTV10A
2. Replacment capacitors 470μF

Step 1: Finding the Problem

1.  The first step was to find a safe place to work on the TV. I put a moving blanket on our dinning table and put the TV face down on that.

2.  Next I unscrewed all the screw that i could find and removed the stand and back cover.

3.  I inspected all the capacitors and found 4 of them were damaged on 2 of the circuit boards on the left and right of the set.  You can easily see when they are damaged when the ends are bulged out and/or split open.

4. I unplugged, removed, repaired and replaced one board at a time.

 
dschilz1 month ago

Thanks for the Instructable and good comments as well. Only thing I would add is that, even though you should match the same exact micro-farrad value, you can always go to a higher voltage rating on your caps as long as they physically fit on the circuit board. This voltage rating is it's maximum break-down value so a little higher will certainly not hurt and, may in fact, help. Lots of bad caps out there so spend a bit more and get them from reputable places like Jameco or digikey. Never gotten a bad or counterfit part from either one.

csiverd2 months ago

I don't know if this thread is still open, but I just removed the back of the tv and inspected the boards and I don't see any puffy caps or any obvious signs of a component frying. What next? Mine is a VIZO XVT423SV.

Thanks

rww675 months ago

What is the voltage rating on the replacement capacitors 470μF ?

MartinMakes (author)  rww675 months ago

The voltage rating is 35v

MohitG25 months ago

I have a VIZIO M420NV and it's 'VIZIO' logo light is blinking and it's white. Display is not turning on. Not sure what happened with it.

Could it be the circuit board? I would welcome any recommendations if I should repair it or buy a new one

semosig6 months ago

My Vizio GV47L (47 inch) TV works fine except the 2 HDMI ports no longer work. Is there a way to replace the HDMI ports?

semosig6 months ago

My Vizio GV47L (47 inch) TV works fine except the 2 HDMI ports no longer work. Is there a way to replace the HDMI ports?

AndyZ27 months ago

Nice tutorial. Takes little bit of work but definitely fixes the issue. For parts that can't be fixed, www.vizpartsdirect.com sells boards if you are unsure or unable to repair the TV yourself.

4doora9 months ago

Thanks for the instructions! I just fixed my dad's 42" vizio.

alex1sc10 months ago

Oh yeah. THANKS!

alex1sc10 months ago

I just used this on my Visio GV47L (47 inch) TV. It appears to have worked. For mine, it would flicker after being on for about 10-15 minutes. However, when I opened it up, none of the capacitors looked swelled or blown. I replaced the 2 on the master and the 2 on the slave boards and put it back together and it (so far) appears to have worked. My wife says it still make a light clicking sound when you put your ear near the TV, but that might be normal? I don't hear it.

nelson_k11 months ago

Anyone have ideas on how to repair the sound on a Vizio TV? It works through the DVD player but not without. Thanks for any help!

daldridge31 year ago

GREAT instructable, I found the exact same tv while my family and myself were on our nightly walk around the neighborhood. Someone had thrown it out, right next to the recycling. I took it home and turned it on and it would nothing but flash. I tried everything that Vizio said to do( reset it) but nothing! So I searched for flashing repair and found your instructable and $6.40 later I had I perfectly good 42" LCD TV. Thanks again for the great instructable!!

MartinMakes (author)  daldridge31 year ago

Fantastic story! I'm glad my instructable could help.

jujypooge1 year ago
i had this TV sitting around for a couple of years after the flicker/blank screen. I found this posting and everything worked out perfect. Now I have a new TV!
MartinMakes (author)  jujypooge1 year ago

Awesome! I'm glad it worked for you.

pfred23 years ago
I just replaced bad caps in my Samsung. I went with the same ratings but a better manufacturer. I got Nichicons.

I'm not sure if hot glue is a viable replacement for silicon. They have different heat ratings.

I'm also not too keen on the idea of using WD-40 as a flux remover. WD-40 is designed to lay around for a bit, not evaporate too quickly. WD-40 is essentially aerosol oil. Rubbing alcohol is a more generally accepted flux removing solvent. It is the main ingredient of my actual flux remover. A bit of nail polish remover (acetone) with it and you're good to go there.

It is great your repair worked for you though.
MartinMakes (author)  pfred23 years ago
WD 40 is used to displace water from electrical circuits and forms a protective layer. So it is not a problem to use it.

TIP: Use WD40 on you motorbike electrical system to protect it from water.

The hot glue I use has a melting point of about 180 C. The reason I use it is that it sets fast. I also use it to seal outdoor electrics like seasonal lighting ( Halloween and Christmas ) good to insulate and waterproof.

Thanks for the comments. Nice to have feed back.
Nice to see whatever works.