Sony KDL-40R510C suddenly gives code #6

[RJARRRPCGP]

Suddenly, there's a green LED, but it's very brief. Then a red LED blinks 6 times, pauses and repeats. (probably at 1-blink-per-second)

This Sony TV, certainly doesn't look like the champion that the old Sony Bravia, which still has a nice picture and sound! The old Sony Bravia is still on HGTV right now, right outside my bedroom.

The Sony with the problem, is my mother's and father's, in their bedroom on the upper floor.

I'm like, "WTF!", after doing a tiny bit of internet search-fu, wondering how an LED or LEDs can be bad, even when very possible.

The picture background color, first off, doesn't look bad, unlike the LG 49UH6100 that's in my sister's bedroom, where it looks like faulty LEDs, FFS! (based on internet photos)

[RJARRRPCGP]

Re: Sony KDL-40R510C suddenly gives code #6

Update: The main board is the most suspect, because it's been working in demo mode sometime after moving to our new-to-us house.

Unlike Sony cameras, which are well made, it looks like Sony TVs lately, (the recent ones, at least since the later-2010s) have a lot of problems! It seems to almost always be the mainboard.

[RJARRRPCGP]

Re: Sony KDL-40R510C suddenly gives code #6

Unlike the LG, LEDs or one of the LEDs, are more likely to fail without visibly failing.

I saw this YouTube video:

https://www.youtube.com/watch?v=yaF9Vo6Bjs0

It doesn't even look that hard to get to the LED strips.