From 48cd3555f614ad2b00d9b8b27a0c5f9f5e6cdd0f Mon Sep 17 00:00:00 2001 From: Dennis Brentjes Date: Wed, 30 Sep 2026 17:38:17 +0000 Subject: [PATCH] D9 USB LED: loose contact reflowed, now lights correctly Co-Authored-By: Claude Opus 5 --- hardware/re-bba-rb/TODO.md | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/hardware/re-bba-rb/TODO.md b/hardware/re-bba-rb/TODO.md index 18d84cb..ba28123 100644 --- a/hardware/re-bba-rb/TODO.md +++ b/hardware/re-bba-rb/TODO.md @@ -249,18 +249,17 @@ schematic changes. 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+ / 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 - bring-up 2026-09-30). Assembly defect on this unit, NOT a design bug.** +- [x] **D9 "USB" LED dark — OPEN SOLDER JOINT on its anode pad — FIXED by + 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 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 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 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 + - reflow D9's anode pad** (and R42's pad on the same net, `Net-(D9-A)`, - while the iron is there). Cosmetic indicator only; does not affect the - power mux, which is working (GC/USB handover verified via D8 + rails). + the terminal was sitting on the pad without wetting it. **Reflowed — + D9 now lights correctly.** Cosmetic indicator only; never affected the + power mux, which works (GC/USB handover verified via D8 + rails). Footprint is not suspect — D6/D8/D12 are the same reverse-mount part (Everlight 24-21, C2980185) and all three light correctly. - [ ] **12 V inrush limiter (U13 TPS25961 eFuse) — SCHEMATIC DONE 2026-07-31**,