I have a sylvania 37 in flat screen that will not come on.

From the bottom there should be a couple of screws to hold the base on. If they are not there then you need to remove the concealment panel at the base where the stand goes in. Once that is off you will see 3 or 4 screws holding it on.

check for bad component parts at the t-con board.

The power supply is down . Sylvania power is very simple went you take the back off you should see the two bad capsitators on the board.Just replace them with same value .

Hello; I am John at J. D. Electronics, Poland Maine. This problem is usually caused by defective inverter transformers. These sets are made by Funai Corp. I have now replaced 100's of these. They are about $5 each and most sets have 5 to 8 of them. Replace them ALL at once. There are many other problems I have found that require replacing whole PCB's , so this is only a guess. John

Power board is dead,must replaced parts like capacitors puff up or burst open.Or replaced the whole power board.The websites Shopjimmy.com,Ebay.com have reburbish power board part.

I just want to clear things here.
The stand by light will remain on whenever the tv set is turned on by a button on the side of the tv.

Then use your remote to turn on the tv, but wait as it can take 10secs before you get a picture.

try to replace all popped capacitors on the power supply board first,the tops of bad ones will be heaved up in a "bubble"

To remove the base stand, place the TV face down on a smooth surface. Place a cloth underneath it to protect the screen. Remove the 4 phillip screws from the stand. The stand can now be removed. The set can with a cover plate you can use to cover the opening.
See page #86 in the User Manual.

i have a black cloudy area about 2 inches wide and 14 inches long at an angle onmy 37 ninch sylvania hdtv

if its remote control try pressing no 1 and see if it comes on.alternatively the on and off switch if faulty on th tv,but the remote control should still switch it on.also switch off the tv for 24 hours by completely removing it from the mains and see if that resets it.
ricch