Replacing NTC Thermistor with an SMD Resistor

[ScyberMhaster]

Hello masters! This is the diagram from my motherboard's PWM Controller (Richtek RT3606BC). I experience overheating flags on VRMs, even if it is not literally overheating. There are two NTC Thermistors in my motherboard, on the top side, I measured it with 68k Ohms on ambient temperature, as I put heat on it, its resistance goes down. On the bottom side, there is also an NTC Thermistor with that diagram (above). However, when I measured it, it is constant 12.09k Ohms, regardless of heat. So I suspected that I have a faulty thermistor, so I replace it with a resistor (98k Ohms), but still it shows 12.57k Ohms, so I replaced the R1 with 0.5M Ohms, and I get a constant 67k Ohms on the NTC Thermistor (Resistor) part. Am I doing this right? Hehe. Just experimenting and no advanced knowledge with this. Hehe.

 

[Nigel Goodwin]

It's extremely unlikely your thermistor is faulty (unless you've physically broken it), they are incredibly reliable devices. You can't read it's value in-circuit, because you also read through the other connected components - particularly R1 and R2, but also potentially the IC.

If the system thinks it's overheating, why do you think it isn't? - replacing the thermistor with a resistor will remove all protection from the VRM's, which could potentially be catastrophic.