We recently had an iPhone SE 2022 (3rd Gen) come into our workshop with a frustrating issue: the touchscreen was completely unresponsive.
The customer had already tried screen replacements elsewhere — no luck. That’s when the real diagnosis began.
Diagnosis: Touch Not Working Due to Broken Trace
After ruling out the screen, connector, and software issues, we narrowed the problem to the logic board itself. Using a microscope and schematic tools, we found the most likely cause:
A broken trace between the Touch IC and the screen connector — a micro fracture not visible to the naked eye.
Logic Board Secured for Microsoldering
We began by removing the iPhone SE logic board and placing it securely in a PCB holder to avoid movement during microscope work and soldering.
Inspecting Under the Microscope
On closer inspection, we identified a missing connection in the touch signal path. Rather than digging further into the board to locate the exact break — which could cause more damage — we chose a safer, smarter approach: a jumper wire from point A to B.
Board View Verification
We used boardview and schematics software to cross-reference the pinout and ensure the signal path was correct before making the connection. This extra verification helps avoid mistakes in multi-layer board work.
Notice all the parallel trace lines in the detailed view of the board close to the iPhone touch IC. The board is weak in this area and prone to flexing. This is the reason the traces break on this iPhone model.
Precision Jumper Wire Repair
A single copper wire was microsoldered from the output of the touch IC directly to the pin on the screen connector responsible for that signal. This bypasses the damaged trace entirely, restoring the connection.
iPhone Touch Function Restored
After reassembling the phone and testing with a new screen, the touch was fully functional again. A clean jumper repair saved the day — no need to replace the logic board or throw the phone away.
Need Advanced Microsoldering Repair?
Whether it’s touch issues, charging problems, or dead devices — Device Repair Guy can help with advanced logic board repairs.
Visit us at 148 Lambton Quay, 104 Manners St, or 57 Willis St in Wellington.