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A 4 blink code on this set is a Fan Error per the service manual, and this means one of the three fans inside of the set has stopped spinning (due to dust/debris, failed bearings, etc.).
If you're looking to repair this yourself, you will need to be comfortable disassembling the TV, then accessing and cleaning, lubricating the 3 fans in the set (it's generally the rear exhaust fan however). Is this something you're looking to do yourself?
If so, let me now and I will pull up the service manual for you.
Alternatively, if this is not something you're comfortable with- then a shop will typically charge between $150-$250 parts and labor to clean/replace the fan(s) as necessary. Keep in mind either of the three fans will trigger a 4 blink red code on the set. It doesn't point to a specific fan, it simply indicates "Fan Failure".
If you'd like, you can use the link below to locate a shop in your area:
Other than that, I'm sorry for the bad news and wish there were a quick fix.
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The error code indicates are shown on page 11, and the main Scirocco fan and it's access is outlined on page 20 of the service manual below.
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