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Sounds like a power supply issue possibly bad caps. You can get replacement power supplies from www.tvrepairworld.com just hit the contact us button on their website to leave a email with your model number if you dont see your model listed.
If the red light won't come on it is not getting power.First,try plugging it in to a different outlet,or unplug one of the gadgets you know is working and plug the tv in there.You are simply switching.If you know that there is power coming from the outlet and it still won't come on then you'll have to check the cord;don't go much farther than that without expert help.
hi welcome to fixya
i want to clarify first the problem sir so as of now the problem with your tv won't power on then you are using again the old main board is that right ? when you use the new replacement main board the tv is functioning will the only problem is that the HDMI / DVI inputs doesn't work. and now you encountered power supply problem like won't start up or something that cut the supply in which the stand by indicator is turn off so as my idea it has a problem with the old board. but before you come up with the board making sure all the connectors coming from the power supply is properly connected to the main board as will as flexible and lvds cable for the T-con board is properly inserted.just let me know if is that what you are asking for so i can give you additional solution thanks for consulting the fixya.
if the tv won't power up then just only a blinking light from the indicator, you will need to check the power supply first. you can apply the visual checking usually bulging capacitors at the secondary filter capacitor of the power supply they are leak which need replacement. sample of bulged capacitor
en.wikipedia.org/wiki/Capacitor_plague . you can find replacement at www.digikey.com. now after you replaced defective capacitors turn on the tv unit then check all the out put voltage if normal the 5v stand by. 5v switched, 12v, and 24v for inverter ballast now if those voltage are stable i'm pretty sure your tv unit will working fine.
Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
This sounds like the main power board went bad. If this is still under warranty, contact 1-877-MYVIZIO and they will have it repaired for you. if not, let me know and I will guide you to the right part.