After 1hour of red led flashing the tv turned on with an issue

Hi,

i have a samsung tv lcd serie 5 from 2012

it have of problem that it turn on after some hours

so, after searching, i found that i need to replace the capacitors on the power board

but the capacitor looks ok, not blown or something

anyway, i replaced 2/8 capacitors

and the problem didn’t fixed and i got new problem which is the colors in the screen and blinking led 6 times every 1minutes for about 1hours(which is better than before that it was taking 4 to 5 hours to turn on)

Another thing

The motherboard have a lot of acid in the back of it, so, i clean it with alcohol 95%

What i should do other than buying new motherboard or power board?

Do i need to continue replacing the capacitors ?

what is the reponsable components for that colors ?

Two boards photos

Appreciate any help !