@oldturkey03 My bridge to C602 is trying to emulate SL but i think it is not necessary and i’m removing it now. Then black stuff at the IC6 left is my attempt to put solder so i can connect broken via.
Yes “corrosion around IC4” is a typo, sorry about that.
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Because i can’t follow the PCB trace properly, i try to shine a phone camera light diffused by few layer of paper towel to the PCB. From my previous attempt i know that via under my wire bridge is destroyed so i try to connect it with long copper wire but still not working. I suspect that there is a further corrosion under the IC6 and unfortunately further procedure require IC6 desolder and i don’t have right equipment to do so. But thanks for y’all help so far.