9468B3 Audio iC

Audio faults are one of the most common tickets a GSM technician sees on the Samsung Galaxy S20 series and Xiaomi Mi 9/10 boards, and more often than not the root cause traces back to a single point on the motherboard: the 9468B3 audio IC. This chip sits between the CPU's audio interface and the phone's mic, earpiece speaker, loud speaker, and headphone jack circuits. When a customer walks in with "no sound on calls," "mic not working," "one side speaker gone," or "hang on logo after audio issue," your multimeter checks usually lead straight back to this IC before you even open the schematic.The 9468B3 works as the audio codec — it converts digital audio signals from the processor into analog output for the speakers and converts analog mic input back into digital data the CPU can process. A short, dry joint, or IC-level damage here shows up as garbled audio, one-channel dropout, mic sensitivity issues, or complete silence on both incoming and outgoing audio paths. On Samsung Galaxy S20, S20+, and S20 Ultra boards, and on Xiaomi Mi 9 and Mi 10 series boards, this IC occupies a fixed position near the audio connector traces, which makes it a predictable and repeatable repair point once you've handled a few units.For your repair bench, this means a dead-audio complaint doesn't always require a full board swap or a costly out-of-warranty replacement quote for the customer. In most cases, an IC change resolves the fault completely, provided the surrounding traces and the audio power rail test clean. Before reaching for the hot air station, check for physical damage around the IC footprint, run a diode-mode check across the audio lines, and rule out a software-level audio driver glitch — some "no sound" complaints trace back to a corrupted audio codec configuration rather than hardware failure, and a software flash resolves those without any soldering.Where the hardware fault is confirmed, this becomes a straightforward reballing and rework job for a technician who already runs BGA IC changes regularly. Preheat the board evenly on your hot air rework station, lift the faulty 9468B3 cleanly without lifting pads, clean the footprint, reball the replacement IC to match the original ball pattern, and reflow with correct temperature control to avoid tombstoning or bridging. A microscope check after reflow confirms ball alignment before you power the board back on. This IC is manufactured for direct drop-in use on the original footprint, so you're not modifying pads or adjusting the schematic — it fits the same position the original chip occupied.This audio IC sits within the board-level repair workflow alongside your power IC, CPU, and charging IC work — the same soldering skillset, the same hot air station, and the same reballing stencils you already use for those jobs apply here. Stocking this IC on your bench means fewer callbacks for audio complaints on S20-series and Mi 9/10 boards, and a faster turnaround for one of the most frequently reported faults technicians see in the service center. Each unit is tested before packing, cutting down the chance of a second failed unit on the same job and protecting your workshop's repair time on a ticket that customers usually want back the same day.