Blinks red 7 times

SOURCE: My Bravia Model KDL 46Z4500 (4 months old) turns

Replaced circuit board under warranty.

SOURCE: my sony bravia tv is flashing red stand by light

Try leaving the TV unpugged for 30 minutes so the TV can reset itself.
If that doesn't work, most likely the TV has a power supply related problem. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
I can't say it's 100% the problem because I can't actually look at the tv over the internet.
If by chance the TV is still under warranty, go that route.
If not under warranty and If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you flashing red light codes, circuit diagrams, test points, and part# lists. Usually, cost under $20.

I hope I shed some light on the subject for you.

SOURCE: Sony Bravia standby light flashing 6 times

there is a bad ground may on the cable check the voltage on the cable & set if on cable call the cable company. if tv call sony they may help with cost may be still under warranty

SOURCE: Sony KDL46XBR switches itself off randomly light blinks red twice

Your power board got zapped you will need to replace it.

SOURCE: sony bravia 200 z tv turns itself off at random

EASY.. SWITCH AC OFF!!!
NEVER HEAR A SONY GUY TALKING HERE...