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There is more than one problem with. A it could be the main board that finally gave out. B the power board in your TV is not work, and now you can see a picture. Depending on how it's connect the screen could be burn out. but just what type of light comes on when you try to turn it on. if the green light comes on and stay on then it has to do with the picture not the power if you need help narrowing down the problem you can call 226-2211 My E Discounts. I'm a tech and we work with a Astar TV from time to time.
Most video problems originate in the power supply and not the video boards.
Lack of ventilation seems to be damaging the electrolytic capacitors in the PS's
If you know how to use an LCR meter and desolder the caps, you can determine which ones to replace. The PS feeds all the varius boards in the back of the set. This is the first place to start. If the main fuse is bad, you may have to replace the IC regulator chip too. Hosfelt Electronics or Mouser are good sources for components.
Make sure to replace with 105c rated caps. You may help the ventilation problem by adding several holes on the back plastic panel over the PS. If you have no electronic skills, it is best to hand it to one that has. Good Luck.
OK HERE'S THE DEAL WITH THE ASTAR YOU ALL SPEAK OF THE PERSON FROM SOLUTION 3 IS RIGHT IT'S A POWER SUPPLY ISSUE WE'VE GOT 130 OF THESE I'VE FIXED 40 OUT 44 POWER SUPPLIES. IF ANY OF YOU HAVE SOME SKILLS WITH SOLDERING. THE MAIN PROBLEM IS IN THE CAPACITORS. THERE ARE 3 SETS OF CAPACITORS THAT NEED TO BE REPLACED. 4 3300uf 35v, 8 2200uf 25v, 7 1000uf 10v. ONCE YOU REPLACE THESE YOU SHOULD BE GOOD TO GO. THE OTHER 4 WE HAVE PROBLEMS WITH ARE STILL POWER SUPPLY ISSUES BUT ALITTLE MORE IN DEPTH WILL POST WHEN WE FIGURE OUT THE PROBLEM.