Introduction: Vizio TV Repair

Picture of Vizio TV Repair

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

Picture of 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.

Step 2: Repairing

Picture of Repairing
1.  First thing to do is get replacement Capacitors. After a quick look on line I found my local Radio Shack had some in stock. I when and got 4 of the  470μF 35v capacitors the temperature rating was a bit lower than the originals but should work fine.

2.  Next I desoldered the old capacitors, cut the mounting silicone with a sharp blade and removed them.

3. After cleaning up the the old solder flunks with an old tooth brush and some WD40. I bent and cut the new capacitor leads  to size making sure the polarity was correct.

4.  I then soldered them in place and cleaned with WD40 again

5.  Then used hot glue to replace the silicon mountings.

6.  Finally put the board back and plugged back in.

I put the back cover on and put all the screws back, plugged it all in and it worked great with no problems and is still working now.


armetr (author)2016-11-19

My VIZIO HDTV doesn't recognize the network[s] available. The VIZIO tech mentioned a part that might need replacing. Does anyone know what that part might be and where I might get it?


MjS19 (author)2016-04-17

I have a 42" Vizio model number M420NV perfect picture everything works except the sound! Anyone know what I need to fix my sound or just buy a sound bar?

AmikkaS (author)2016-04-15

My speakers are blown what can i do

EuniceA5 (author)2016-04-08

I replaced all thr capacitors on my tv. Tried it just now and its still flickering.

InstructmeBH (author)2016-02-29

Thanks I will try it out

InstructmeBH (author)2016-02-29

Thanks I will try it out

InstructmeBH (author)2016-02-29

Capacitors hmmm...

StephanieC88 (author)2016-02-06

My 42 inch vizio just plain lost its picture and sound all at once. When you turn it on the vizio word changes from amber to white then slowly dims slightly and thats it no picture. I removed the back panel and found two bad capacitors i am currently trying to purchase new ones but my symptoms are differnt could i have additional problems?

laself (author)2016-01-12

I replaced the bad capacitors and now I have NOTHING. What did I most likely mess up? I was careful handling the board and soldering and have the polarities right. I double checked the remounting and connections. Any suggestions?

jorgem65 (author)2015-11-01

I am here to testify this fix worked for me also. My 7 year old 42" Vizio was rapidly blinking between bright and dim.

Took back cover off. Put the different screws in zip lock baggies to reduce confusion later. Don't waste time uncovering big cover in the middle like i did; it's the 2 covers on each side. noticed the caps were puffy on ends.

Radio Shack is now out of business. Got the 4 35v, 470uF Nichicons caps from Amazon ($14).

Soldered out old caps. wasn't comfortable using WD-40 either to remove flux. Mixed acetone with alcohol. used cotton swab. didn't really work, just left cotton fuzz on sticky flux.

Soldered in new caps. confirm polarity. i didn't have glue gun or silicone. the caps weigh nothing. i figure the solder will hold just fine.

Put 2 side covers and the cover back on.

It's been 6 weeks. TV is working great.

dschilz (author)2015-07-19

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.

csiverd (author)2015-06-11

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.


rww67 (author)2015-03-09

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

MartinMakes (author)rww672015-03-31

The voltage rating is 35v

MohitG2 (author)2015-03-17

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

semosig (author)2015-02-24

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?

semosig (author)2015-02-24

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?

AndyZ2 (author)2015-01-27

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

4doora (author)2014-11-19

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

alex1sc (author)2014-11-01

Oh yeah. THANKS!

alex1sc (author)2014-11-01

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_k (author)2014-09-17

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!

daldridge3 (author)2014-08-29

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)daldridge32014-08-30

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

jujypooge (author)2014-01-31

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)jujypooge2014-02-01

Awesome! I'm glad it worked for you.

pfred2 (author)2012-03-30

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)pfred22012-05-22

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.

pfred2 (author)MartinMakes2012-05-22

Nice to see whatever works.

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