Yes, this is normal. The 2009 white plastic non-Pro Macbooks don't have their temperature sensors tacked onto the exhaust port of the heatsink, and so there's no cable running from there to the logic board's temperature sensor socket (J5520, to the left of the fan), but instead one temperature sensor is contained inside the CPU (the "CPU diode"), one is on the logic board in proximity to the CPU, one is inside the MCP chip, and one is on the logic board near the Northbridge chip that interfaces between the CPU and the rest of the logic board. A utility like Macs Fan Control can show you the temperature readings for all these sensors.
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Yes, this is normal. The 2009 white plastic non-Pro Macbooks don't have their temperature sensors tacked onto the exhaust port of the heatsink, and so there's no cable running from there to the logic board's temperature sensor socket (J5520, to the left of the fan), but instead one temperature sensor is contained inside the CPU (the "CPU diode"), one is on the logic board in proximity to the CPU, one is inside the MCP chip, and one is on the logic board in proximity to the Northbridge chip that interfaces between the CPU and the rest of the logic board. A utility like Macs Fan Control can show you the temperature readings for all these sensors.
Yes, this is normal. The 2009 white plastic non-Pro Macbooks don't have their temperature sensors tacked onto the exhaust port of the heatsink, and so there's no cable running from there to the logic board's temperature sensor socket (J5520, to the left of the fan), but instead one temperature sensor is contained inside the CPU (the "CPU diode"), one is on the logic board in proximity to the CPU, one is inside the MCP chip, and one is on the logic board near the Northbridge chip that interfaces between the CPU and the rest of the logic board. A utility like Macs Fan Control can show you the temperature readings for all these sensors.