OLED panel failed

The engineer has just been to my daughters house to look at her 2.5 year old 55” Panasonic OLED TV that went off last week, it’s a TX-55HZ980B and covered by Panasonic’s 5 year warranty.
He diagnosed a screen failure and said they would order a new OLED panel / screen and return in approximately 7/10 days to replace it, is it common to replace the panel as I have been told that the cost of the new panel plus the labour costs could total as much as the cost of a replacement TV.
She’s been without her TV for over a week now and it looks as though it will be at least another week before she can watch it again

We had the panel replaced on a Samsung under warranty a few years ago though he did it there and then (JL TV repair guy). We'd have been going up the wall without a TV, I'd have bought some crap off marketplace to tide us over and then sold it again.

OK, update on the original post, 2 engineers returned to replace the 55” OLED panel, put it back together, turned on and the fault still existed.

They said that when the screen failed it must have taken the power board with it, so they took the TV to their workshop, replaced the power board and the fault still existed, it took 5 weeks to get the TV back.

On the positive side, apart from the stand and rear casing she’s got a brand new TV