Warning. TV circuits can hold dangerous power levels. Take all precautions, to prevent electrocution. Discharge caps, etc.
If you suspect that there may be an issue with the power protection, I suggest that you check for a bad diode. A bad diode or e-cap is very typical. Bad e-caps can, often, be found with a close visual inspection. Look for leaks and/or swelling.
I imagine the flash code means something in particular, but you will likely have to dig for that, yourself. A cap can power an LED for a good long while, depending on what components are involved.
Here is the manufacturer's document site. The bigger operations manual has a troubleshooting section that mentions blink codes. But, I didn't see your pattern.
https://www.sony.co.uk/electronics/support/televisions-projectors-lcd-tvs/kdl-32s5600#downloadsYou may get better information, on a TV repair forum. They're out there. Be careful though, some are pay to play.
Also, I think YouTube has some channels where you can ask questions. I did a quick YT search for your make and model and found several videos directly related to your issue.
https://www.youtube.com/results?search_query=SONY+KDL32S5600The reason you did not get a quick response is likely the fact that most folks on this forum think you have a basic responsibility to investigate these types of resources yourself. I, on the other hand, think that, sometimes, folks don't know about these basic resources. Hence, why I replied.
Keep at it. Ask more questions, if necessary.