Television and Home Theater

We turned on our Sony rear projection TV...and the convergence is a mess....we still get a piture although clearly the convergence is way off.....the front LED blink 4 times....the set is about 5yrs old and this is the third time it's needed repair.....I was hoping to get a service manual to decode what the 4 blinks mean and see if I could fix it myself......I've serviced other  TVs....but I'm certainly no pro....any help is appreciated.  

Hello,I just wanted to thank Mr Dillon.....you are one smart fella.

I'm receiving snow and the channels in the upper right hand corner continously evolve from 1-99.

By luck or through persistantly turning the tv on and off I can eventually get a local channel ( I'm on an antanae}, and a good picture.Even when I get a good picture the channel numbers in the upper right hand corner still continue to evolve. When I do get a channel I don't dare turn it off or I'll have to start the process al over again!