JTX BGA Reballing Stencil — 0.3/0.35/0.4/0.5mm UV Green Oil Isolation, Universal Hole Spacing

The JTX BGA Reballing Stencil 0.3/0.35/0.4/0.5mm is a practical tool for any technician who replaces the solder balls under a chip instead of replacing the whole chip. Pitch means the center-to-center distance between two balls, and each hole in the stencil is cut for one pitch, so you pick the hole set that matches your chip’s ball layout before you start. When a cracked joint causes a dead phone symptom or a boot loop issue, a clean reball can bring the chip back, and this stencil covers four pitch sizes without forcing you to buy four separate stencils. Start by removing the old balls with flux and solder wick or your reballing station. Clean the pads with isopropyl alcohol and let them dry fully, because residue under the stencil causes missed balls and bridging. Secure the chip in a holder so it does not move, then align the JTX BGA Reballing Stencil 0.3/0.35/0.4/0.5mm over the chip. Check that every hole lines up with a pad, and press the stencil down so it sits flat against the chip. Apply flux through the holes, pour the balls onto the stencil, and spread them with a soft brush until each hole takes one ball. Tap off the extra balls and inspect the holes under magnification before you move on. Lift the stencil straight up slowly, so the balls stay in their positions. Reflow the chip with your hot air station using a moderate temperature and a steady airflow, and let it cool completely before you touch it. Thin steel responds quickly to heat, so keep the nozzle moving and heat the whole chip evenly instead of focusing on one corner. Many technicians report that a stencil lifts or warps when heat concentrates on one side, and a lifted corner can release balls before they reflow. If you see this, stop, let the stencil cool, and reseat it in the holder. Clean the stencil with isopropyl alcohol after every job, because old flux dries into the holes and blocks the next set of balls. Store it flat and away from sharp tools, since a bent hole causes bridging or missed balls on the next chip. Inspect each hole before you start, and replace the stencil when you see a warped plate or torn edges. Technicians often use pitch-matched stencils for eMMC, NAND, PMIC, RF, and CPU chips, so confirm your chip’s pitch on its spec before you pick the hole set. Match the ball diameter to the pitch, because a ball that is too large sits on top of the pad and a ball that is too small fails to make contact. Your repair bench also needs a magnifier or microscope, a good flux, solder balls in the correct alloy for your work, and a stable hot air station. A reball will not fix a chip with a hardware fault in its power rail, so test the board and confirm the chip is at fault before you spend time on a reball. Follow the sequence of diagnose, remove, clean, stencil, reflow, and test. A clean first pass saves you from overheating and losing the chip on the second attempt.