LG 42lw4500 flashing red light , wight light , 2 clicks

[GRANDGG]

Hi i have an issue with LG 42lw4500 wich after pressing the power button flashes red then goes solid white light 2 clicks and nothing , the weird thing is SOMETIMES if i leave the tv plugged in it would come on and fuction normally (i should mention that vertical rectangle going from the bottom to the top of the screen have some red dot artafacts it only appear in somthing like the tv input menu and any input i give like vga , but not in the system menu , i thought i should mention this , i cannot confirme if the tv had this issue when it was up and running in its previous owner . ) when checking the voltages i found that 3.5 12 24 are all present , trying to turn the tv on all the voltages drop to 0v in the perioud of two clicks and they go back to normal.
i did check all big caps by removing them and messuring the with my mutimiter and they all fine .

[lotas]

The problem is in these chassis processor, if reballing does not help, then only replacement, and since these processors are no longer available (new, original), then look for a motherboard...

[GRANDGG]

Are you sure the issue is the processeur as the tv does turn on and fuction normally sometimes , if that's the case would a reflow be enough as i do have a hot air station .

[lotas]

The BGA balls come off, contact is lost, and that's where the problems come in: sometimes it turns on, sometimes it doesn't, and there's a stripe on the screen, also because of the processor soldering...
Heating with a hair dryer may not help, you need to remove the old solder and apply new balls (with lead) through a stencil.

[GRANDGG]

I guess you are right as serching lg cpu reballing directed me to the same tv just a slightly diffrent loggic board and if you watched the vedio the issue is fix it by rebballing the cpu .
bummer as i would need a board heated wich i dont have so i need to source a new board seems very difficult .

The youtube vedio :
https://youtu.be/qkkXPnq6hDA?si=SSqYia86NsEdYwyc