Just tried to troubleshoot the following pcb 
I am checking the capacitors first, none of them have any marks of them so I'm using my multimeter to check their resistance.
(I've checked online and found at least one site that says they can be tested by checking the resistance, however I found other sites that say they simply can't be tested using a standard multimeter.)
When reading the resistance of the top 4 capacitors, the leftmost three have the same reading; 18.73kΩ, however the last one reads 2.2kΩ. They all have the same markings on them, so I assumed the readings should be consistent.
Does this mean this capacitor needs replacing, or am I barking up the wrong tree?
Thanks.
Best Answer
You can't reliably glean any information that way when IN circuit.
If they are all connected in parallel to the same circuit they will all measure the same anyway. e.g. decouplers.
If they are connected to different circuits you would have to factor in the resistance of the circuit. Even then, if it is not what you expect, you can not know if it is the capacitor or something else in the circuit.
With the capacitor in hand, or with one leg up, you can use a multi-meter to check for shorts or perhaps leakage in the capacitor, but that's about as far as that little meter will take you.