The 9 blinks is caused by failed zero cross diodes you can get the repir kit for that issue which includes the diodes nd the CD with repair instructions from www.tvrepairworld.com the kit is listed under the Sony Repair kits catagory.
SOURCE: Sony KP-51Ws520
9 blinks means, "Zero Crossing Detector" and the probable cause locations listed are "D6166 or D6114 is open (G board)". I had the exact same problem so I just ordered a new G board and swapped it with the old one and now everything works fine! You could order a new one at this site: http://www.partstore.com/PartSearch.aspx?PartNumber=A1054157A&x=31&y=19. The Sony board number is A1054157A. Replacing the G board is rather simple; all you got to do is pull out the back cover of the TV and the G board is the first board on your very left. After that unplug the four connectors and replace it with the new one. Here is a picture of the G board inside your TV: http://img47.imageshack.us/img47/8396/backev6.jpg. Hope this helped!
SOURCE: Sony Wega stanby light blinks 5 or 6 times
When a Sony TV flashes five times, that means that there is an AKB circuit fault.
Six blinks is also a fault related to video problems, and regards a fault concerning the digital board and the Jungle IC (the main CPU).
This means that there is something wrong with the video.
Try first unplugging power for few hours, if that does not work, call a
technician, as several IC and components must be tested and eventually
replaced.
SOURCE: 9 blinks
D6117- Change switching Regulator on G board you can also do Self-Diagnostic Mode Press display ,5 . vol- ,power. this should turn set on and show other codes telling you what else maybe wrong. TO Remove codes and clear back out Press display,5,vol+,power Now Press 8 and Enter.
SOURCE: My KP-51WS520 blinks 10 times
Type in Sony Blinking codes on Google you will find all blinking codes and what they mean.
SOURCE: I have a Sony KP-51ws520. I cannot power on. says
Those LED flashs are a fault indicator...First thing to do is to try a reset:
With the TV plugged in push and hold down the reset button on your remote then press the power button on the the TV and then release the reset button once the screen has come up.
9 blinks means, "Zero Crossing Detector" and the probable cause locations listed are "D6166 or D6114 is open
If you are handy you can replace D6301 diode and it fixed the problem. You can buy that diode at partstore.com for $3. good luck
If still no luck then this is going to require a serviceman.
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