Question about Vizio Televison & Video
I have a Vizio VO22L FHDTV10A that lost the picture but still has sound. I can see an image on the screen with a flashlight, so I am guessing either the backlight or the inverter board has failed.
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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: 26" LCT HDTV Backlight Problem
It can be that the inverter is not getting the 24vdc fromt he power supply module, check for that first, you can check it at either the power supply termninals or at the inverter board. Look to see if the power supply has any leaking/bulging top caps. Modules are easy to replace, fixing it down to component level is not so easy unless you have proper tools an electronics knowledges.
Power supply and Inverter bd: http://www.shopjimmy.com/catalogsearch/result/?q=Vizio+VA26L+
Learn more here:
Posted on Jun 14, 2010
Testimonial: "Thanks. I swapped out the inverter board for one that I know works, but still have the same proble. I'll look for indications of a bad power supply for the backlight."
Chec to see if you are getting 12vdc at the T-CON board power input pin first.
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Please see my basic troubleshooting guide here:
Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Posted on Oct 04, 2010
Testimonial: "So far so good! Almost got it figured out. Thanks!"
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