I need help. I found that contact 3 has no resistance reading, while the other three contacts show normal resistance values. So, I scraped into the second PCB layer at this contact, but it still reads no resistance, leading me to conclude that there's an internal trace break within the board layers or an IC failure.
Through Google searching, I learned that both contacts 2 and 3 connect to the B303 IC, but I don't know which specific point underneath this IC they connect to. I then removed this IC and used a continuity test on contact 2, confirming that contact 2 connects to the red point. However, when I tested contact 3, I found that it was not connected to any point. Therefore, I concluded that the IC itself is not damaged, but rather an internal board line is broken.
To fix this, I need to figure out which point contact 3 connects to, but I'm currently unable to confirm it.
Through Google searching, I learned that both contacts 2 and 3 connect to the B303 IC, but I don't know which specific point underneath this IC they connect to. I then removed this IC and used a continuity test on contact 2, confirming that contact 2 connects to the red point. However, when I tested contact 3, I found that it was not connected to any point. Therefore, I concluded that the IC itself is not damaged, but rather an internal board line is broken.
To fix this, I need to figure out which point contact 3 connects to, but I'm currently unable to confirm it.
