FAULT FINDING IN SMD RESISTOR & DIODE

 Fault Finding in SMD Resistor



To check SMD Resistor, first keep the multimeter in Buzzer mode.

If it is good, then the multimeter will give a Beep or Buzz sound. If there is no sound, then keep the multimeter in ohms mode & check if the resistor is showing any high value above 2K.

If it showing value, then the resistor is good, or else it is open which needs to be replaced.

Fault Finding in SMD Diode. 

SMD Diode
SMD Diode

To check SMD Diode, first keep the multimeter in Buzzer mode.

Connect positive of the multimeter probe to Anode (+ve) & negative of the multimeter probe to cathode (-ve) which is said to be forward bias. In this condition, the multimeter should show a value between 130 to 600 ohms.

Then place the multimeter probe in the reverse direction (reverse bias)., i.e., positive probe to cathode & negative probe to anode. In this condition, the multimeter should not give any value.

If there is sound or both side value, then it needs to be replaced with a new one.

Note: There is no polarity for SMD Capacitor, Resistor, Coil. It can be removed or place in any direction. But Diode has a polarity which needs to be replaced with the new one in the same direction. You can find one vertical mark near the cathode point.

These are the important process of the Fault Finding of Components in Mobile Repairing

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