Lenovo V14-IILWont Only post with OnBoard RAM

[Kambi13]

Hi all, need some help, I've got a Lenovo V14-IIL that as total of 8GB of RAM (4GB onBoard - 4GB Sloted), out of the blue it stopped posting, After investigating, found out that removing the RAM stick from the slot, the laptop would post and work with no other issues. So tried with a different RAM stick suspecting that the original one somehow died, but to my frustration the issue remained, so again tried a different number of known working RAM sticks with different capacities and speeds but with no avail.... Unplugged Battery, removed CMOS battery,Reset and Updated Bios, also measured voltages and I'm getting 1,20V in the inductor that provides RAM voltage, and also tried in the RAM stick itself, checked the pins in the slot thinking that maybe one had some cold solder joint and found nothing. Unfortunately I'm still at square one!!!
Does anyone have a clue what could be causing this issue?
Best Regards

[RethoricalCheese]

Sadly common issue on this board.

I haven't checked yet but take a look at ram slot pins. Poke them with tweezers to check if some pins are loose. Most likely either first pins or last pins.

[Kambi13]

Yeah already tried that they're all pretty solid, and to make sure also tried with beeping mode with multimeter

[прямо]

Most likely broken solder ball joints under the CPU, that are part of the data and clock lines connected to the RAM slot. Which is why if a RAM stick is inserted into the slot, the CPU can't post because it fails to communicate with the RAM stick.