Question about Vizio Televison & Video
Hi, I have a Vizio e442va 42lcd I was watching Tv when it turned off and never to on again. The standby light is on and but it never boots up the screen remains black. I am thinking it is the power supply -model 715 g3829-p02-w30-0035 see attached pic or the system board 715-G4365-M01-000-005K. I am first trying to test the power supply. I tested both of the 5v's to ground and I do get 5 volts. I am trying to test the 12v's and the 24v's but I don't know what two pins I need to jump first. Can you assist me telling me what to jump in order to test the: 12v to grounds and the: 24v to grounds? My pins for the cable of the power supply are labelled: pwr-ok 5v 5v ps-on 24v 24v grnd grnd grnd 12v 12v bl-dim Bl-on FYI- there is a diode connecting the pwr-ok to the 2nd 5v Thanks so much
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Posted on Jan 02, 2017
Your main board is faulty. I've done several of these but haven't been able to figure out which component is actually bad these yet. I've simply had to replace the board itself, and it fixes it every time. One thing you can do to get your backlights to come on (and so you know I'm not Jive'n you) Is unplug the three wire bundle that spans from power supply to main board. This will usually make the backlights fire up. I even had one that after I left it that way for a minute (with the backlight on) it suddenly started working again! But this was short lived. :-(
One time I even tried recapping the entire main to see it that would fix it. It did not. I think it might be something to do with the small chip labeled SL37HA37. It's a 16 legged bastard near the 3-wire plug I told you to pull. It's that or possibly the bigger IC near it that has a heat sink on it. The ball grid array solder joints may be faulty. Just guesses, if any smart guys out there figure this one out, be sure to tell the rest of us please!
Thanks, Chris Boise LCD www.boiselcd.com
Posted on Apr 23, 2010
SOURCE: we have samsung LCD with
So the standby 5vdc is working but not the rest of the power supply outputs are working? Look for PS_ON signal (3.3~5vdc for ON) from the main board that feed the power supply board. You can tak ethe power supply moudule out the do bench test using 24v lamp attach to the 24vdc out put and feed the PS_ON with 3.3v to see if the 24vdc will turn on.
Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.
I have a feeling that the main board is damaged since the protection Diodes are blown, it may have taken out the processor.
Posted on Jul 01, 2011
SOURCE: Vizio refurbished 47 Inch flat screen TV, Model E470VL. After a power outage, the tv comes on to a seemingly test pattern screen, but will not boot beyond that. There is no sound. Sometimes the boo
Sounds like you had a high voltage power surge just before going out
Are u using a high grade reference center or surge stage 2 or 3?
Posted on Nov 28, 2011
Did you check for the "ON" or "PS ON" signal on the power supply board? It should be around 3.3vdc.This signal comes from the main board, it commands the other sections of the power supply to come on and turn on the TV set. This signal should be present when you press the power button from either the TV or remote. If you are not getting this signal from the main board, you're most likely dealing with a main board failure. If you are dealing with a main board failure, take heed, some Vizio main boards can be expensive.
Posted on Sep 05, 2012
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