Smart TV continually restarting

[Jimm]

Hopefully someone can help/advise on the problem I've got with my Smart TV (UE40D5520RKXXU).

A few days ago the remote was used to power the TV up but it wouldn't get passed the start-up screen switching itself off then trying to restart reaching the same point and shutting down and restarting again, this just goes on and on.

Now the power is switched off as it won't start but when the power is switched on it automatically tries to start but fails every time as above.

The TV is about 6 years old, in perfect condition, I'd like to keep it but only if it's going to cost a reasonable amount to sort out.

Last year this same thing happend and I opened the back up to have a look around to see if anything obvious was wrong and with a many power on/offs it started up, much to my surprise, so the back was re-attached and we had been using it without any problems for the last 8 months.

Could the problem be in the software or is it a power supply problem? Hopefully someone can come up with a suggestion or two.

Thanks in advance.

[Artemis81]

This fixed my rebooting. I tried all the suggestions in this thread and was about to dump my RU8000 which is only some 4 years old. Unfortunately it was a week after I'd bough a new replacement, £550 I needn't have spent. The replacement was NOT a Samsung. I shall never buy this brand again, the staff in Currys confirmed they get more faulty Samsungs returned than any other brand.. 

[Billy Martin]

Samsung UE40D5520. Twice I have had it stuck in boot loop.

First time was 2 years ago. Solution: Opened up and disconnected the BLU wire from the power board which allowed the TV to switch on and installed updated firmware. Reconnected BLU wire - this worked for 2 years.

Last week stuck in loop again. Solution: BLU wire did not work this time. I removed the main board (the one with the NAND chip) and put it in the freezer for 30mins. Reinstalled and TV turned on as normal. This time no new firmware available, so used the ‘alternative’ update option which reinstalled a fresh version of the current software.

Hope this helps.