My 40" Coby flatscreen is getting power but wont turn on....any solutions?

Model?

check out this website which deals with Coby products, many people having terrible problems with this company's products and they are not backing up with solutions. Best to dump set and get a different one.
http://coby-tv-reviews.measuredup.com/9211179

Most likely the power board is defective. A new power board will cost $40 to $100 depending on your model. ShopJimmy.com is a good place to look for boards. They are not too difficult to replace if you have a minimum of electronic repair experience.

unfortunately the coby company has gone out of business probably because they have produced an inferior product that has had many, many problems, many people are posting problems with these sets. it is better you just purchase a different brand of tv and leave this heartache causing product behind.

Main power supply regulator board fault. Contact any service technician. Check and replace damaged component/s at it main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Electro help Pull up older posts.

TV will not turn on. At first I coule get it back on and then it would soon go ogg again. Now I cannot get it to turn on. Now a No Signal comes on. Thanks for your help!

I'd add something to this. We had the same issue with a 40" coby. We'd declared it dead and after a few days turned it on again to show the problem before trashing it. The TV came on. We've since learned that there seems to be a HDMI handshake issue related to this tv. If you turn it off with HDMI devices still sending a signal, it will periodically return to this point, and take a day before it will turn back on (I guess until the caps are fully drained.) If you turn the TV off first and then devices however, this never seems to happen. Dunno if this is the same for others, but I'm curious

I had a 32" Coby that did the same thing, turned out to be a defective main board. The main board wasn't sending the 3.3v signal to wake up the power supply. In my case I sold the tv for parts because it wasn't cost effective to replace the main board. It sound like your main board

Your TV's manufacturer support page(s):
http://www.cobyusa.com/?p=support

Solution #1 - exercise the manufacturer's warranty - www.cobyusa.com
or even (possibly) the return policy of the point-of-sale store - find your receipt.

Solution #2 - replace the entire power supply as a unit, rather than debug the (analog
electronics = differential calculus of electronic engineering). analog electronics of the
power supply

Solution #3 - if solution #2 unavailable, desolder each suspected component of the power
and individually test components, until the culprit is identified, then replace it.

hi nick think it may be blown capacitors on your power input board?