Sony bravia KDL-CX520 won't turn on, standby indicator flashes 6 times

SOURCE: Four blinking red lights.

you can have the inverter board replaced...instead of the entire panel.
KDL 40S2010: inverter part # 178950032, you will also need 2 spacers..part # 289765511
you're looking @ 200-300$ for the inverter and 5-10$ a piece for the spacers.

KDL-46V2500: inverter part # A1251295B
you're looking @ around 500-600 $ for the part

SOURCE: Flashing Standby Light (6 times every 2 second interval)

A 6 flash error indicates a problem with the backlight. Your set is less than a year old and still in warranty, so you should contact Sony and arrange for a service call to get it repaired.

SOURCE: Sony Bravia KDL-40V3000 standby light blinking

I just worked on this last week 13 blinks means there is a problem with the backlights.So it can be 1 of 2 things bad inverter board( which costs less than $200) or the panel in which case you can thow the TV away as it will probably cost as much for a new TV.Unfortunately the set I worked on ended up being panel. If you try the inverter board just take your time removing it its plugged in rather tight I gently tapped it out with a screwdriver to get it started.

Rustym62
The TV Dude

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: 40'' Sony Bravia goes into standby with the light blinking 9 times

I finally managed to solve this problem by unplugging everything - scarts - HDD cables - power etc and left it for an hour. When I turned it back on again the problem had sorted itself out.