YCS Inductance Coil Tester

Most dead phone and no power complaints on a modern motherboard trace back to the power section, and the small SMD inductors around the PMIC, charging IC, and backlight driver take constant stress from heat, liquid damage, and drops. The YCS Inductance Coil Tester gives you a fast way to check those coils directly on the board, so you skip the slow routine of lifting parts or reading every component on a meter. The tool works on the electromagnetic induction principle. You bring the probe to the inductor, the tester couples with the coil's magnetic field, and a green LED lights up when the coil responds normally. When the LED stays dark or behaves inconsistently, the coil has an open winding, an internal short, or physical damage, and you can mark it for replacement straight away. That clear pass or fail signal matches the pace of a busy repair counter in Lahore, Karachi, or Islamabad, where one technician handles several dead sets, charging issue phones, and display problem boards in a single shift. Picture a typical bench job. A customer brings an Android phone that went dead after a fall, and your DC power supply or test box shows abnormal current the moment you inject voltage. Instead of guessing, you scan the coils around the main power management area one by one, and the tester shows you which inductor no longer responds. The same approach helps on boards that hang on logo because one supply rail collapses under load, on phones with a dark screen where the backlight boost coil has cracked, and on sets with a charging issue where the coil near the charging IC has failed after a faulty charger surge. In each case you narrow a hardware fault down to one component in seconds, which leaves more time for the actual repair. The tester fits into a logical diagnostic chain. You start with a visual inspection under a stereo microscope to spot burnt marks, corrosion, or cracked parts. You check current behaviour on a DC power supply or test box. You confirm coils with the YCS Inductance Coil Tester, then cross-check resistance and continuity with a digital multimeter when you need numbers. Once you identify the bad inductor, you mount the board in a PCB holder, lift the part with a hot air station, and solder the replacement with a temperature-controlled soldering station. Keep in mind that this tool gives a qualitative result rather than a microhenry reading, so it complements a multimeter or LCR meter instead of replacing it. For a technician, that trade-off works well: you do not need the exact value to know a coil is open, you need a quick and reliable answer before you start removing components. The YCS Y-001 body measures roughly 75 mm by 29 mm, so it sits comfortably in the hand and takes almost no space on a crowded repair bench or in a field kit. You do not need calibration, menus, or software; you power it up and start testing. That simplicity makes it a good tool for training institutes and new staff, because a junior technician learns to read a green LED far faster than interpreting meter values across dozens of tiny SMD coils. Experienced board-level technicians value it for a different reason: it cuts the time spent hunting through the power section, which directly improves how many jobs your shop closes in a day. The tester works on SMD inductors and coil circuits across smartphone motherboards, tablet boards, BGA boards, and computer motherboards, so it stays useful whatever brand lands on your counter. It targets low-voltage electronic components only, so keep it for PCB work rather than automotive ignition coils. If you are building a complete board repair setup, pair it with a reliable multimeter, a quality hot air station, a soldering station, a microscope, a reballing kit for BGA work, and a sturdy PCB holder, and you cover diagnosis, removal, and replacement in one workflow. For repair shops and service centers across Pakistan that want faster fault finding at an affordable cost, this tester earns its spot next to the power supply on every bench.