36 inch tube tv - Screen flickers

Unlikely to need a new screen. The likely culprit is a bulging capacitor heating up and failing.

Its the tube

I had the same issue occur on my ln55c650 and they had to replace the power supply pc-board. Seems some issue with power module in the TV rather than the side panels. Luckily for me, TV was still in warranty.

This sounds like tiling. are you using a cable box?

Yes, I used to work in Best Buy and one of the key things about rear projection TVs and the reason they push those service plans on you is that the tubes/colors need to be calibrated each year. You can do this yourself by checking out the following website: 
http://lgknowledgebase.com/kb/index.php?View=entry&EntryID=3229

Check power supply for the 24Volts connected to the backlight inverter ,bad caps could be the fault

dumped it.

I went to the Sony support page for your model.(link below)http://esupport.sony.com/US/perl/model-home.pl?mdl=KP61V85&LOC=3
They are undergoing maintenance right now, so I couldn't find any answers for you. I would check back with the website to see if they can help you. If the Standby timer light flashes, you may need to have the TV repaired. There is a "Hot Topics" section for "How to troubleshoot television picture issues" that will probably be very helpful to you.

Looks like your picture tube is dying, or there is a bust capacitor(s) inside...I'd recommend taking it to a service shop to get it repaired.

Cheers!
IrishDruid

Sorry to say, it sounds like a bad picture tube, But could be also the capacitor that filters the screen voltage on the crt drivers. In all my years though, your complaint has been the picture tube. Good Luck.