Sony Bravia OLED XR-55A90J Help Manual page 138

4/7/2021
Count how many times it flashes (interval time is three seconds).
Reboot the TV by disconnecting the AC power cord from the TV for two minutes, then turn
on the TV.
If the problem persists, disconnect the AC power cord, and contact Sony Customer
Support with the number of times the Operational response LED flashes.
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https://helpguide.sony.net/tv/iaep1/v1/en/print.html
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