Resistor showing incorrect value in circuit

Thread Starter

rokz_2005

Joined May 14, 2011
68
Hi,

I opened up an inverter board for an LCD screen. I thought I would use a multimeter to check all resistors to see if any of them were not working.

I found two SMD resistors near each other, type '103' which is 10k but the reading I got was about half of that. I checked other '103's on the board and they displayed the value correctly.

The board is not connected to any power supply. Are they broken?
 

MCU88

Joined Mar 12, 2015
358
You cannot measure resistors while they are in circuit. The reading will be wrong. You need to remove them from the circuit first.

It is very rare for an resistor to be faulty... (generally speaking) ...
 

crutschow

Joined Mar 14, 2008
34,285
Any other resistances in parallel with the resistor being measured will affect the measured resistance. That's why, in general, you cannot measure resistors in a circuit and expect the correct value, unless you know there're no other resistive paths in parallel with the resistor.
 
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