vizio turns on and off in matter of sec

[bigred*]

So its the vx32l model to be exact, I've been trying to read what I could, but most everything I've read has been on just answer with techs giving pointless advice to guys who don't understand it, and can't follow through
Whats happening is I plug it in, the orange light comes on, hit the power, vizio logo turns white for about 3 secs then back orange, no flicker, back light or noise, the relay never even clicks on which makes me think the problem could be there but I've also read it could be a software update.. well I've got my multimeter on the ready, where and what should I be looking for?

[bigred*]

Re: vizio turns on and off in matter of sec

Oh and I have no bulging caps anywhere or anything that looks fried

[budm]

Re: vizio turns on and off in matter of sec

Pictures of the boards and the whole back side of the TV?

[bigred*]

Re: vizio turns on and off in matter of sec

Are these good enough? It was pretty hard to get a good pic of the caps as they are covered, but they're aren't bulging out the top at all

[bigred*]

Re: vizio turns on and off in matter of sec

I'm guessing if this is a hardware problem its in the power supply right?

[budm]

Re: vizio turns on and off in matter of sec

Let's start with checking the power supply output voltages at the 3 connectors when the TV is OFF, and when TV is ON.
List the voltages of each connector.

[bigred*]

Re: vizio turns on and off in matter of sec

Going down the rows the top two sections both split off to each side of the tv and mirror each other
Power off they all vary between 0.00v to >1v
Power on the top 4 pins show 24v and the rest are >1v

The bottom 3rd outlet read, well I can't remember, the top pin power off read <1v, power on read 3v, the next few ones I can't remember, some said 0v power on or off, and some of the pins close to the bottom said 5v power on or off.. problem is, is while I was testing these, it all of a sudden lost power, the vizio logo on the front no longer lights up orange at all and I'm not really getting any power ratings at all anymore, i don't know if I contaced two pins at once and shorted something out or if something was going out and just finally went completly out

[bigred*]

Re: vizio turns on and off in matter of sec

And the fuse is still good

[truep]

Re: vizio turns on and off in matter of sec

From your fourth picture, There looks to be at least one bad cap under the heat sink.
Are all of them perfectly flat on top? It's the brown one on the left.

[newtothis]

Re: vizio turns on and off in matter of sec

Ok unplug the set and plug it back in after a few minutes... still no life?

Are there any signs off life at all?... LED or anything?

[bigred*]

Re: vizio turns on and off in matter of sec

No its flat, ill see if I can get a better pic of it, but ya no life at all, no leds or anything, I unplugged it and let it sit, I tried different outlets and still nothing, is there something specific I could check on the power supply to see if it failed, to rule out the possibility of it being that other big board below the powersupply where the on and off signal comes from, I know when that board was unplugged the tv would show no signs if life like it is now

[newtothis]

Re: vizio turns on and off in matter of sec

DMM set to dc 600v ... probe to each leg of the big 450v cap on the PSU... Careful!!.. Deadly Hot Side!

[bigred*]

Re: vizio turns on and off in matter of sec

By dmm do you mean digital multi meter? All I have now is my cheap harbor freight one I'm still learning to use, no 600v setting, on 200v setting its not reading anything, on 1000v setting its flexing between 140-145

Haha when I was younger me and my friends used to pull disposable camera apart to get to their 400-500v capacitors and we'd make little tazers out if them, stung like hell to get hit by one!

[newtothis]

Re: vizio turns on and off in matter of sec

You do have it set to DC don't you?... As it is below 200v at the moment the 200 setting should of picked it up.

Well at least we have power going in but can you confirm the voltage... DC 1000v probe to each leg.

[bigred*]

Re: vizio turns on and off in matter of sec

Ya I'm going to do some reading to make sure I'm using this right as its not like my old one I'm used, the one I have now is the free one they give you at harbor freight, and yes its set to dc
That's what I wasn't getting, if its saying 145 when set to 1000vdc then that would mean 145 v but then why is it not showing up on the 200vdc.. also I did notice when I unplugged it I went to discharge that big capacitor so I didn't zap myself, and well there was nothing in it to discharge, no pop

[Shane711]

Re: vizio turns on and off in matter of sec

Looks like it has been a long time since anyone has posted on this post. Just wanted to add my comment. I have worked on a few of these TVs and every single time it is the main filter cap, the biggest one on the power supply. 120uf 450v. You will not see it pop but you may see it leaking from the leads. The leads burn right off it. So even if it looks good just remove it and test it. No other time have I seen it to be anything different.