» Low ohms resistor such as 0.22 ohm, 0.33 ohm and etc. » Horizontal yoke coil winding of a picture tube, inductor and primary winding of a transformer – If a shorted turn is present, inductance drops dramatically and meter will show ohms reading. » Horizontal output transistor (HOT) in a monitor or TV – If an open-circuit reading is obtained, short-circuit is elsewhere. If short-circuit remains, transistor is faulty. » Short-circuit in track, usually trace to components - You can use ESR meter to locate short-circuits on printed circuit boards by measuring actual track resistance. If reading increases as you probe further along track, you know you’re going in wrong direction! » Speakers, amplifier etc - The pulses have a fast rise/fall time, so it would probably make a crude RF signal injector as well. » The condition of both normal and rechargeable batteries – Flat and faulty battery will have high ESR.

Is some cases a fuse will open up fast enough when there is a surge so that other components aren’t damaged. If this is case, replacing fuse with one of same type and rating restores operation. Unfortunately, a high probability exists that if a fuse blew, something in circuit it was protecting shorted out. In this case, a replacement fuse blows right away. The blown fuse can easily be replaced by a new one, after overload has been eliminated when come into replacement. Use only same current and voltage ratings as original. The common type and current rating of a fuse in a monitor are slow blow 2A to 5A. When you buy replacement fuses, get several – you can easily use all of them while you’re troubleshooting an elusive problem.

Testing Fuses

Turn power off and remove fuse from circuit to check with a multimeter set to lowest ohms range. Connect probes to both end of fuse. You may check fuse while it still in circuit. A good fuse should showed continuity or read 0 ohm. A blown fuse is open which reads infinity on meter.