Sanyo DP42849 in particular is known to fail into a mode where it would not want to power on and this would have nothing to do with the power board and bad capacitors.
Please note that this does automatically mean the problem is NOT in capacitors or that the problem you have is the same that they are known to develop.
If anything, most Sanyo models are also known to come in several , often completely different sub-models (they call them chasis), so for example Sanyo DP42849 chasis P42849-03 is completely different from chasis P42849-04.
For more see
http://blog.coppelltvrepair.com/2012/07/sanyo-dp47460-dp42840-dp46819-and.html
And for possible repair service use
http://www.coppelltvrepair.com/search?q=dp42849
Hope this helps!
WHEN I PUSH THE ON BUTTON ON MY HDTV 50 INCH, THE GREEN LIGHT COMES ON AND THEN IT GOES OFF COMES ON GOES OFF. WON,T COME BACK ON UNLESS I PUSH THE BUTTON AGAIN. SAME THING OVER AGAIN. WON,T STAY ON...
Plasma and LCD TV sets are prone to having capacitors in the power supply section fail. This is the most likely cause for the probem you describe. When capacitors fail your will commonly see one or more of the following symptoms.
Again, You can get a power supply repair kit with the parts, detailed instructions, and support from sites such as www.TvRepairKits.com . Or just click here to see more details on their kit.
Here are pictures of capacitors...Notice that the ones below look bloated. They have failed and will need to be repalced. 
Capacitor being replaced! Fairly easy DIY fix.
Again, You can get a power supply repair kit with the parts, detailed instructions, and support from sites such as www.TvRepairKits.com . Or just click here to see more details on their kit.
REPLACED POWER BOARD AND THE T V IS DOING THE SAME THING LIGHT COMES ON FOR A FEW SEC. THEN GOES OFF AND ON AND OFF
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