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D9 USB LED: loose contact reflowed, now lights correctly

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Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Dennis Brentjes
2026-09-30 17:38:17 +00:00
parent 951c7bc3f3
commit 48cd3555f6
1 changed files with 5 additions and 6 deletions
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hardware/re-bba-rb/TODO.md
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@@ -249,18 +249,17 @@ schematic changes.
OVLO divider off 12V_RAW, R_top ≈ 1.1 M / R_bottom ≈ 100 k → trip ~15 V. OVLO divider off 12V_RAW, R_top ≈ 1.1 M / R_bottom ≈ 100 k → trip ~15 V.
See REVIEW.md eFuse entry. Bench workaround: feed 12 V onto 12V_EXI (C65+ / See REVIEW.md eFuse entry. Bench workaround: feed 12 V onto 12V_EXI (C65+ /
U3 VIN) to bypass it. This must be fixed before any V2.1 fab order. U3 VIN) to bypass it. This must be fixed before any V2.1 fab order.
- [ ] **D9 "USB" LED dark — OPEN SOLDER JOINT on its anode pad (found at - [x] **D9 "USB" LED dark — OPEN SOLDER JOINT on its anode pad — FIXED by
bring-up 2026-09-30). Assembly defect on this unit, NOT a design bug.** reflow 2026-09-30. Assembly defect on this unit, NOT a design bug.**
Symptom: D9 never lights, on USB-only or GC power. Measured 3V3 on the Symptom: D9 never lights, on USB-only or GC power. Measured 3V3 on the
anode-side pad and 0 V on the cathode with the LED dark — i.e. the full anode-side pad and 0 V on the cathode with the LED dark — i.e. the full
rail standing across it, so no current and no drop across R42 (if D9 were rail standing across it, so no current and no drop across R42 (if D9 were
conducting the anode would sit at Vf ≈ 2 V). Touching the anode pad with a conducting the anode would sit at Vf ≈ 2 V). Touching the anode pad with a
meter probe makes it light at full brightness: the probe pressure closes meter probe makes it light at full brightness: the probe pressure closes
the joint. So Q2 (S8550 PNP) and R42 are fine and the LED itself is fine — the joint. So Q2 (S8550 PNP) and R42 are fine and the LED itself is fine —
the terminal is sitting on the pad without wetting it. **Fix: flux + the terminal was sitting on the pad without wetting it. **Reflowed —
reflow D9's anode pad** (and R42's pad on the same net, `Net-(D9-A)`, D9 now lights correctly.** Cosmetic indicator only; never affected the
while the iron is there). Cosmetic indicator only; does not affect the power mux, which works (GC/USB handover verified via D8 + rails).
power mux, which is working (GC/USB handover verified via D8 + rails).
Footprint is not suspect — D6/D8/D12 are the same reverse-mount part Footprint is not suspect — D6/D8/D12 are the same reverse-mount part
(Everlight 24-21, C2980185) and all three light correctly. (Everlight 24-21, C2980185) and all three light correctly.
- [ ] **12 V inrush limiter (U13 TPS25961 eFuse) — SCHEMATIC DONE 2026-07-31**, - [ ] **12 V inrush limiter (U13 TPS25961 eFuse) — SCHEMATIC DONE 2026-07-31**,