SAMSUNG LE40B530 need help

[daroo]

Hi, I have a samsung LE40B530P7WXBT.
It started to show a message sayng "not avaiable" ( "non disponibile" in italian). The message stays always on and in every source. the menu doesn't work well anymore, it stays for less than a second and than goes away.

I have tried to reset the tv but it doesn't work. I have opened the back and I can't see any visible damage, fuses are ok.

[daroo]

Re: SAMSUNG LE40B530 need help

Not the easiest thing to fix purely because of how fiddly it is but it is doable, you'll need to remove the button assembly and then free the PCB from the button housing, you will see 7 micro switches, these are the cause of the issue. Using a Stanley knife blade, very carefully prise off the metal retaining cover(go to the side and gently twist the tab, it will gently rise allowing for careful removal) once off be careful that you don't loose any of the components, there's the retaining clip, a plastic button and a very small metal disc pressure pad(dome up). You'll see three points of contact, two outer and one centre, around these you may see what looks like a water mark, this is probably a form of corrosion and so needs scraping away, gently scrape away and clean with Isopropyl Alcohol freshening up the contacts at the same time, do this for all the buttons and it will cure the issue. I hope this is of some help to someone, good luck and thanks, Andy.

I've found the solution searching on this fantastic community.
Thanks to the member Dang.
I post this pic to help who wants to do the same operation: