Repaired a board that had some very minor liquid damage to LP8550 and U3210. Got everything cleaned up, went to test the board, and all is fine except the Thunderbolt port. I noticed that whenever I plug a device into the Thunderbolt port, it causes the unit to slooooowww down and throttle itself almost as if a sensor is damaged. Trackpad movement is incredibly slow (even slower than when a bad trackpad is installed, etc). When I unplug the thunderbolt cable, all returns to normal immediately.
When troubleshooting, I noticed I pulled a U3210 from an 820-3437 board to repair this one; I didn't realize this chip was actually different between the two boards. I replaced the chip with a proper one (from another 00165), and the issue persists.
System Preferences does not show anything connected ("No device connected") when I plug in a Thunderbolt monitor (that I use to test all boards with). Everything around the area looks fine where the liquid spill was.
Any idea what the issue could be? Did I fuck something up by installing a slightly different chip? This is a customer board, so unfortunately they will want Thunderbolt working of course. Any ideas appreciated!
When troubleshooting, I noticed I pulled a U3210 from an 820-3437 board to repair this one; I didn't realize this chip was actually different between the two boards. I replaced the chip with a proper one (from another 00165), and the issue persists.
System Preferences does not show anything connected ("No device connected") when I plug in a Thunderbolt monitor (that I use to test all boards with). Everything around the area looks fine where the liquid spill was.
Any idea what the issue could be? Did I fuck something up by installing a slightly different chip? This is a customer board, so unfortunately they will want Thunderbolt working of course. Any ideas appreciated!