Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

Did you read post 14 as well? also when the remote control transmitter did not work when the picture came on, but I don't know if it works anyway, has new batteries and the light works when pushing buttons. I noticed the Processor on the main board is very warm when I leave the 3v battery to PSON to keep voltages present to Main Board, I was hoping to isolate the problem down to a bad component but may need to just replace the Main Board instead of spending hours trying to fix it. any Ideas on which component? it looks like all the Voltage regulators are good. Thanks.

[budm]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

I think to get down to component level beside the bad regulator will be real hard to do without the diagram. The strange thing is that you did get to see the pictures on the screen but do not have much control on some of the function. You can use your digital camera to find out if the remote's infrared emitter is working or not by just pointing the remote at the camera lens, then you should see flashes on your camera's screen as you press the remote buttons.

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

I actually had control of the functions while the picture was on the screen, all buttons worked and I was able to power off with the on/off switch but wouldn't power back on, only had sound for a few seconds at a time, maybe once every 5 or 10 minutes,but volume level bar on tv screen worked.So I guess I need to order a Main Board..I didn't know about the digital camera to test infrared emitter on the remote, that's awesome, will test it tomorrow. Thanks for the info.

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

The remote test worked with the digital camera so I'm hoping the Main Board was also causing it not to work. I'm wondering if any of the electrolytic caps could be bad on the main board causing this problem, didn't see any bulging. Thanks again to all you guys for all the help, this forum is the best. All of you guys are Great!!!

Someone near here has a Vizio Model VX37LHDTV10A Mine is a VO37LFHDTV20A too bad the boards are different, otherwise I would get it for the parts, it has a cracked screen but works fine other than that. Both are 37" Vizio but I don't think the LCD Panel would interchange, if it would I could put my panel with that chassis.

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

I removed the main board this morning to visually inspect, didn't see anything obvious. re-installed it, now the PSON 3.3 is present again, I pushed power on, heard relay click, checked all voltages are present on rails of power supply,5v,5vsb,pson,12v,24v. My question is...Shouldn't the backlights be on?? the voltages are all there. can a malfunction on the main board prevent them from coming on? last time this happened I left the tv on in this same state and it started working after leaving powered up for a few hours it had a picture with intermittent sound, no remote control function, (hand held remote transmitter is good), all function buttons on the tv set worked. could it be something other than the main board? remember the 3.3 PSON is Not Always present.
Thanks in advance..I appreciate it..

[budm]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

Do you get the BL_ON also for the inverter to be on.

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

I didn't see anything marked BL_On but I just left the TV On in the state it was in and gradually came on like this: !st 3.3 PSON Was present, I turned on tv with power switch and heard relay click, after about 20 mins the backlight came on then in another 10 mins. the video came on the screen with a great looking picture using a dvd movie via input to tv. intermittent sound at only 2 seconds to up to 10 second bursts. I think it is a component on the main board but its hard to isolate it. What do you think?? Thanks again Bud.

[budm]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

On you power supply board, I believe there are pins labeled with 'A', 'B', one of this is for BL_ON, another one is for Dimming, these two wires from A and B should go to the inverter board, the wires will be bundle wih the same set of wires for the 24vdc for the inverter.
There should be 'ON/OFF' or 'BL_ON, or 'ENA' pin on the inverter board, that will be used for turning inverter on-off.

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

In checking A and B Terminals both connectors on the power supply rail and While the TV had a picture, "A" had 1.7v and "B" had 5.1V on both connectors, I just checked it and this time and was only able to turn on the PS with the 3v battery to PSON, in this case now with no picture both A&B only had .03 and .07 volts. So do you still think it's a main board problem?? how does the BL_ON and Dimming voltage arrive to the A&B Pins on the PS? in other words does the main board make the power supply board supply these voltages?? Thanks!

[budm]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

That means the main board is not sending out those two signals to the inverter board. The signals for the A and B from main are routed through the power supply board, the power supply board is just the junction points for these two signals, into one connector and out at the other connector that goes to the inverter board so the wires routing is cleaner that way with just one bundle of cable to the inverter board.
I really do not know what you can do to fix this main board at this point.

[tom66]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

It could be a problem with the large heatsinked processor. Perhaps BGA bonding issues. You can try reflowing it in the oven. I brought an Nvidia GPU back to life doing that. But remember to use flux. Lots of flux.

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

That particular processor heat sink does get pretty warm almost hot to the touch, I thought that maybe that meant it was working, but I guess it could be partially working, I did do a reflow to a processor on an xbox one time using a heat gun and it actually fixed the problem, but maybe the oven would be better, should I load up lots of flux on the underneath side of the heatsink trying to get it under the processor, then put the main board on foil and put in the oven on ??____degrees, for ??______Minutes.

[budm]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

That was the same as the Vizio VO370M that I am trying to find the main board for it. The heat sink for the processor was too hot to touch even in standby mode. I could not put my fingers on it more than 10 seconds.

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

That was the same as the Vizio VO370M that I am trying to find the main board for it. The heat sink for the processor was too hot to touch even in standby mode. I could not put my fingers on it more than 10 seconds.

There's some on ebay, here's the link to one.

http://www.ebay.com/itm/Vizio-3637-0...item1c2e36fec0

[budm]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

I have been looking, but it cost too much. I will wait for the one with broken screen to come in.

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

I've been looking for one like mine with a broken screen too ,but may try the re-flow or buy a used board.

[beer-b-q]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

I'm in the same boat.

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

Hi beer-b-q I'm in Florida on vacation and bought this Vizio, going back to Illinois this weekend, I've searched craigslist both here and home, no luck on this model with a cracked or broken screen, there is one place on Ebay that has 5 of these Main boards for sale asking $79.99 with free shipping, you might want to make sure you have the same exact one, part number on white sticker with bar code.

http://www.ebay.com/itm/140890120074...84.m1438.l2649

[MisterD]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

Any re-flow method suggestions from anyone???? Thanks!

[Ogien]

Re: Vizio 37" VO37LFHDTV20A Has Standby Vizio Amber Light

Please keep this thread going as I'm in more or less in the same boat with OP. VIZIO 26" with not picture, left it on and eventually the picture would come on.

Finally, that trick stopped working and now I have a VIZIO that has no picture or light from the lamps. The Orange logo is on when the tv is powered down and turns white when powered up (this is normal for this tv).

I check almost all of the regular suspects in regards to bad caps (I'm wondering if maybe there is a bad cap that didn't blow it's lid as that does happen some times) and I checked the fuses and everything seems OK. I need to check the voltages but had to locate batteries for my multitester which I did just a few minutes ago.

I like to listen to and work on all sorts of tube and solid state high end audio gear and I also like working and modifying amplifiers and building kits. I mention this to settle my skill level with electronics.

I have looked on YouTube, like everyone else, and the solution everyone is displaying is the changing of the Motherboard. This is NOT what I want to do. I want to find the specific component that is malfunctioning.

Someone out there must have that information about the component because refurbished boards are being sold by every Tom, Dick and Harry so they must be refurbishing (replacing/fixing) something and I would like to know what that something is.

Replacing boards is just not my style. Yeah, the money is an issue and a gamble but mostly I find it hard to believe that these boards are not "serviceable" cause I can see every component on there and thus I know it IS serviceable.

Any advice beyond what's already been posted?

Also thank you for a great thread with tons of info and also, this is my first post.