Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.
SOURCE: MY HISENSE TV SWITCHES CHANNEL IT SELF AND
take batteries out of remote control see if it stops
SOURCE: Hisense tv turns on and off
STOP!
The unit has a fault on its power board and sustain board.
It turns off because the sensor is preventing some component from bacoming overheated and catching fire or damaging further components. Seel professional repair.
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SOURCE: Hisense tv
The problem with these poorly made (in my view) sets is they are made in China and the company there has gone out of business by my count 2 times---they make poor sets for export and no parts or service literature so when you replace it consider another brand and something worth being repaired.
SOURCE: HL32V86 Hisense 32' stuck on standby wont turn on it seems screen stay black
Call the HiSense tech dept. You can find the number on line and they will tell you how to fix it or you can try using the remote and go to settings and see if you can fix it that way. Also the manual for this tv should be available online as well.
SOURCE: I can get a picture on my Hisense tv just a blue screen, I hear everything but can get a picture
Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
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