| Electronics > Beginners |
| How to test dead components on a board? |
| (1/1) |
| Mechatrommer:
Can anyone teach a proper way of testing a working or broken components without separating it from its board? a) Resistor b) Capacitor c) Inductor d) Diode e) Transistor f) FET/MOSFET? g) chips And Dave, can u make a video on many types of diode and/or transistor and/or FET/MOSFET. Diode alone have many types (Scmith, Schotky, i dont know the names and differences), all i know diode is a one way ticket for the current to flow. |
| dds:
Oscilloscope, Huntron tracker, (component tester) while DUT is turned off. |
| dds:
ESR meter for elco capacitors. |
| djsb:
Hi, Circuits should be checked using a top down approach wherever possible working from the front panel of a unit and finally down to component level. This helps to isolate a fault to a specific subsystem. 1/ Visual check for burnt components,leaking capacitors,loose components,shorted tracks etc. 2/ Voltage checks using Schematic or service manual if available. 3/ Signals can be injected and traced to narrow down a fault. 4/ When the specific suspect area is isolated then individual component checks can be done. 5/ Most checks can be done with a multimeter using the ohm meter,continuity tester and diode test feature. a/ Resistor-Check for correct value, open or short circuit b/ Capacitor-Check if the capacitor charges using the ohm meter. c/ Inductor-Check for open circuit. d/ Diode-use diode check for correct forward voltage drop (0.7 for Silicon or 0.3 for Germanium etc) and infinite reverse resistance. e/ Transistor-Use diode check to test individual PN junctions. f/ FET/Mosfet-Check drain source resistance. g/ Chips-Check voltage at power pins and refer to schematic/data sheet for other voltages. That's the fault finding method I use anyway. Practice and persistence also helps. HTH David. |
| Kiriakos-GR:
I believe that all the "Ideas" , that David added so far , are all that you will ever need. But as Mediterranean technician , I would add and the most famous one .. the hammer ;D ;D ;D If everything else fails , its your only option !! :D |
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