I have sony kdl-46hx800.When I turn on tv it work for 10 min. than cuts off by its self after that red light blinks 7 times.

You need a service engineer

SOLVED: blinks the red light 10 times frequently - Sony Bravia ...

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Apr 24, 2018 - @hdcifix215 10 blinks apparently is not a real error code from Sony. The descriptor for that is "Watch Dog Timer used to track micro processors, ... 2 answers
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Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. If blinks continue without any pause, the main board is faulty.
Counting of number of blinks to Philips TVs is entirely different to that of other brand TVs. It is not a direct count procedure. The site have details about how to count the number of LED blinks [Fault Codes] to Philips brand TVs are given; along with details of the faulty circuit location.

Sir
please one thing remember that red led blinking indicate specie fault please watch red light count and find the correct fault which is written below
Monitoring Items Number of Flashes of red led Main Power Supply Voltage Error 2
DC_ALERT1 3
DC_ALERT2 4
DC_ALERT3 5
Backlight Error 6
Internal Temperature Error 7
Audio Error 8
Digital FE Error 10
Trident Error 11
Balancer Error 13
T-CON Error 14
thanks

Sony Bravia TV kdl- red blinking led light error codes ...

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https://www.youtube.com/watch?v=0KGysXbxnaU
Mar 28, 2015 - Uploaded by Tampatec
Sony Bravia LCD TV KDL models red blinking led light error codes & possible ... with perfect picture, no warning signs and it just shuts off. is it that quick? ... with the following problem: I connect the power grid lights Standby red light. ... the title before deleting, it is very fast after that flashes Standby 6 times.Missing: 46w3000 ‎30

7 blink by it means the internal temperature problem. Can be because the main board is faulty. You have to change the mother board of the tv . Also remember that when you change the mother baord you have to make necessary setting through service settings.
check the link bellow there lost of sony tv models and its service modes are listed . surf with the model number.
http://electro-medical.blogspot.com/

in this case you tv main board is defective because this is a temperate error please replace main board

IKR Error at power on 05. 5 blinks denotes this. Actually, the fault is related to its main digital board, and the work will not an easy one. Anyway, http://electronicshelponline.blogspot.com/ check this link. Pull up previous posts there, either by its left side bar, or view it in Timslide option, and see whether there is something to help you. If you're not sound in electronics, no need to proceed. Contact any service technician or authorized service centre for Sony.

Sony Bravia 7 blinks disclosure
https://www.facebook.com/photo.php?fbid=711021065598851&set=a.103481003019530.7279.100000728915080&type=1&stream_ref=10

Replaced circuit board under warranty.