PMD9645 For iPhone 7 7plus Baseband IC

Every iPhone 7 and 7 Plus motherboard depends on a chain of power ICs to keep each subsystem alive, and the baseband section has its own dedicated controller: the PMD9645. Qualcomm manufactures this chip and marks it on the board as BBPMU_RF, though most Pakistani technicians simply call it "baseband power IC" or "chhoti baseband IC" because of its compact 103-pin footprint compared to the larger baseband chip beside it.This IC does not process signal data directly. Instead, it manages voltage sequencing and power delivery to the baseband processor and RF front-end. When you get a handset with "no network," "no sim detected," "signal aata jata hai," or a phone that shows full bars but never actually registers on the network, this power IC belongs on your suspect list before you jump to the main baseband chip or antenna flex.A common failure pattern shows up after liquid damage. Corrosion around this area breaks the power rails going into the chip, and the phone either shows no network at all or randomly searches for signal without locking on. Another frequent case: dead after flash. If a technician flashes firmware and the phone dies or bricks with no baseband response afterward, checking continuity and voltage on the PMD9645 pads often reveals a lifted pin or a shorted rail caused by the reflow heat from a previous repair attempt.Because this is a small IC with tight pin spacing, reballing requires a proper stencil matched to the 103-pin BGA layout, quality solder balls, and controlled hot air temperature. Overheating the surrounding capacitors or adjacent RF shielding during removal is the most common mistake that turns a simple IC replacement into a multi-hour board repair. Technicians working with a microscope get far more consistent results than working with naked eye, since alignment on a footprint this dense leaves no room for guesswork. Diagnosing before replacement saves time and avoids unnecessary IC changes. Check the voltage rails feeding into this chip with a multimeter first — if you see a dead short on a rail, don't apply power to a new IC until that short is cleared, because the replacement chip will burn immediately. A DC power supply with current-limiting is your best friend here; watching current draw at low voltage tells you whether the board still has a short before you commit to reballing.This chip fits directly into the standard mobile repair workflow: diagnose the power rail issue, remove the faulty IC with hot air, clean the pads, reball with matching solder balls, align under microscope, reflow, and test network registration. It pairs naturally with your existing hot air station, microscope, and multimeter, and belongs in the same toolkit as your ISP pinout tools and jumper wire stock for board-level iPhone repair.Stock genuine PMD9645 units rather than pulled or reworked chips when possible — a used IC pulled from a damaged donor board carries a higher failure rate and can leave you chasing intermittent network issues that trace back to the replacement part itself rather than the original fault.