PMI8994 Power iC

Power faults on Snapdragon 808 and 810 boards rarely trace back to a single cause, but the PMI8994 sits at the center of more dead phone cases than most technicians expect. This IC isn't the main PMIC — that role belongs to the PM8994/PM8996 pair — but it works directly alongside them, managing secondary voltage rails, general housekeeping functions, and user interface power support. When it fails or develops a dry joint, the symptoms often look identical to a main-PMIC fault: no power, no display, hang on logo, or a board that draws current but never boots.You'll mostly encounter the PMI8994 on HTC One M9 and LG G4 boards, since both devices run the Snapdragon 808/810 platform (MSM8992/MSM8994) that this PMIC pairs with. If a customer brings in either of these models with a dead after flash condition, or a board that powers on but shows no backlight, checking this IC's solder joints should be one of your first diagnostic steps — before you start swapping bigger, more expensive components.Diagnosing a PMI8994 fault starts on the bench, not in software. Pull the board under your microscope and check for cracked balls, cold joints, or corrosion around the chip, especially on boards that came in wet or after a hard drop. A short on one of its rails will usually show up as high current draw on your power supply the moment you connect the battery, with no display response. If you're seeing that pattern and the main PMIC checks out clean, the PMI8994 becomes the next logical suspect. Some technicians try jumper lagana as a temporary fix on a lifted pad, but a clean reball with fresh BGA balls almost always holds up better long-term than a jumper wire under stress.Replacing this IC is a rework job, not a beginner task. You need a hot air station with accurate temperature control, flux rated for BGA work, and a steady hand under the microscope — pull too fast or too hot and you risk lifting pads on a board that's already fragile from age or prior repairs. Preheat the board evenly before you go anywhere near the chip itself; thermal shock on these multilayer boards causes more collateral damage than the actual desoldering. Once the old chip is off, clean the pads thoroughly, check for lifted traces before reballing, and reflow the replacement PMI8994 with a matched stencil for accurate ball placement.This chip earns its place in a GSM repair shop's parts inventory because power faults on the HTC One M9 and LG G4 aren't rare, and they're not always software marna fixes. A customer with a "no charging" or "hang on logo" phone has usually already tried a factory reset or a battery swap before walking through your door — meaning the fault sits at hardware level, and this IC is a common culprit on these specific models. Stocking a few PMI8994 units alongside your PM8994/PM8996 stock keeps you from turning away board-level jobs on this chipset family.Pair this IC with the right tools for the job: a hot air station rated for fine-pitch BGA work, a decent microscope for pad inspection, and a reballing kit sized for this chip's footprint. If you're already running an ISP or eMMC setup on your bench for software-side faults, this IC covers the hardware side of the same Snapdragon 808/810 repair workflow.