• R_TOP = 453 kΩ: output to FB
• R_BOTTOM = 100 kΩ: FB to GND

Text
3.3 V output ── 453 kΩ ──┐
                          ├── TPS62827 FB
GND ────────── 100 kΩ ───┘

1. Completely disconnect USB and the LiPo.
2. Locate the PCB trace directly connecting U6 FB pin 3 to the 3.3 V output.
3. Carefully cut that trace and confirm with a multimeter that FB is no longer shorted to the output.
4. Solder 453 kΩ between the 3.3 V output and FB.
5. Solder 100 kΩ between FB and GND.
6. Keep both resistors and wires extremely close to U6; FB is sensitive to switching noise.
7. Check for shorts under magnification.
8. Initially power the board from a current-limited bench supply or USB current limiter, without the battery.
9. Measure the output before allowing the ESP32-S3 and other loads to run. Expect approximately 3.3 V.

• U6 is a tiny 1.5 mm VSON package, so soldering directly to FB pin 3 is difficult.
• If the FB trace cannot be isolated cleanly, replacing the IC with TPS6282533DMQR may be safer.
• Do not power the board until the modification is complete. With FB directly connected to the output, the adjustable part will attempt to regulate near 0.6 V, not 3.3 V.
• Use 1% resistors. Avoid long jumper wires around the SW pin and inductor because those carry noisy switching signals.