My control triggers the L2 forever?

No matter what I do with the controller, it keeps triggering the L2.

I tried to change the conductive film (of a dualshock that works), but strangely it keeps pressing the other button, R2.

I think it may be a defect on the motherboard, is there any solution?

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Do you tried to change the conductive pad (the white silicon pad just under L1/L2 and R1/R2) ? If you swap them while changing the conductive film, it would explain why it's now the R2 button that is not working. Also the conductive film is connected with pressure to the motherboard (if there is not enough pressure it could cause some fault), you can check around the pin of the conductive film if everything look allright.