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Run Apple Service Error Diagnostic

Run Apple Service Error Diagnostic 


Run Apple Service Diagnostic version 3S135 to determine if any thermal sensors or blowers
are malfunctioning. If ASD is not available, run Apple Hardware Test version 3A189 by holding
down the D key during startup. When a test reports an error, reseat appropriate connections.
If issue persists, replace the corresponding part (sensor, blower, logic board, video card, or
power supply). See Apple Hardware Error code chart below for correlation between error code,
affected sensor, sensor location, and additional checks to perform.
AHT Error code Suspected part and
Location
Suggested Action Notes

4SNS/1/C0000008:

 TA0P - xxx mbient temp sensor damaged or disconnected from logic board.
Verify sensor cable is securely connected to the top edge of the logic board and attached to the left
speaker housing. Replace sensor cable if damaged. All fans ramp at full speed if sensor is
disconnected.

4SNS/1/C0000008:

 T00p-xxx ODD temp sensor damaged or disconnected from logic board. Verify sensor cable is
securely connected to the logic board and the sensor is properly attached to the ODD mechanism. Replace
sensor cable if damaged. The ODD fan will run at full speed if sensor is disconnected.

 4SNS/1/C0000008:

TH00--xxx HDD temp sensor damaged or disconnected from logic board. Use the correct sensor cable,
each drive vendor has a unique sensor cable. Verify sensor cable is securely connected to top left side of logic board and is connected to hard drive. Check for damaged cable on logic board.
The HD fan may run at full speed if the sensor is disconnected.

 4SNS/1/C0000008:

TL0p LCD temp sensor on LCD is damaged or disconnected from top of logic board
Verify that the LCD sensor cable is securely connected to the logic board and the sensor is attached to the
LCD. Replace the sensor cable if damaged The CPU fan will run at full speed if the sensor is disconnected.

4SNS/1/C0000008:

TS2P-xxx Skin temp sensor (Quad-core models only) is damaged or disconnected from top
of logic board. Verify that the skin temp sensor cable is securely connected to the top of the logic board and sensor is attached to rear housing (near the camera). Replace the sensor cable if damaged.

Apple Support Call us: +1-855-517-2433.
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