I have a RCA P61937 and i have sound but no picture. does this t.v. have a bulb that could have blown out?

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No,
You would need to purchase a new tv. TVs are either Hi-def, or they are not.

WE HAD THE SAME PROBLEM AND OURS IS AN OPTICAL ENGINE. WE ARE CURRENTLY LOOKING FOR SCRAP TV OR OPTICAL ENGINE. GOOD LUCK WITH YOURS.

well look under power supply board around flyback. they have bad solder joints. it will then blow
the 400 ma fuse. just rtesolder the flyback and replace the 400 ma fuse beside flyback

Tries these websites like Tvrepairworld.com,Tvrepairkits.com and Ebay.com to search and buy.Price are vary at each sites.

No the problem is not likely the picture tubes - unplug set and see if it restarts

I have the same issue, we've had to change our bulb three times in less than two years. now we have 61" expensive paper weight. Our current bulb is less than 6 months old. The TV is only 2 years old and like i said this is our third bulb.

the blue light blinks 4 times. you get sound. then a few minutes the the picture returns... then it goes out, and the cycle goes on.

A solution to this would be greatly appreciated.

If this is a DLP, which I believe it is, your bulb is blown. Look for an indicator light on the front of the tv. After you hear the bulb try to warm up two or three times the indicator light should come on and stay on steady.
I own a 57" Mitsubishi DLP and have replaced the bulb three times now. It was the latest and greatest technology when I bought it, but knowing what I know, I dont think I would buy another DLP.
By the way, get the bulb number then check ebay, by far the best prices.

bad color wheel

I have a RCA 52inch D52w136D, the power button blinks three times, but nothing happens no picture or sound