Message: "Alert! Air temperature sensor not detected" displayed at boottime. Dell OptiPlex 755

Hi Mathijs,

The air temperature sensor that Dell installs on systems works without any user interaction. There is no need to turn it on or off or to configure any settings. The sensor comes configured for optimal running configurations no matter what climate you use your computer in.

However, if the desktop halts with an “Alert! Air Temperature sensor not detected” Message During Startup, one of the solutions is to "Reseat the Thermal Diode Power Cable".

Please click on the link below for steps to reseat the Thermal Diode Power Cable. Read the Safety Information in the same link prior to opening the system chassis. Dis-assemble the system chassis only if you are comfortable doing so.

http://dell.to/13522yd

Please reply if you  have further queries.

Thanks and regards,
Babita S
#iworkforDell 

For easy access to drivers, manuals and product updates, please visit our Support Site .

Hi,

I have followed the instructions in the link you provided. I opened the case and removed the front IO card to inspect to see where the "Thermal Diode Power Cable" resides. (as described in the procedure). But unfortunately, there is no Thermal Diode Power Cable on the IO card. And I am pretty sure there never was one. I did not notice any loose cables or anything. It seems like there is not even a jack to insert it to on the IO card - there is only one jack and that is a pretty big one (see attached photos)

You can see it on the pictures of my IO card, I have included in this message: could you tell me where the Thermal Diode Power cable jack (connection) resides on this IO card?

I removed the big cable though, then reseated it again, but unfortunately at reboot the same errors occurs (Alert! Air Temperature Sensor not detected).

Do you have any follow up comments, or new tips/ideas?

Any other tips from other forum members are also welcome.

Hi Mathijs, The air temperature sensor that Dell installs on systems works without any user interaction. There is no need to turn it on or off or to configure any settings. The sensor comes configured for optimal running configurations no matter what climate you use your computer in. However, if the desktop halts with an “Alert! Air Temperature sensor not detected” Message During Startup, one of the solutions is to "Reseat the Thermal Diode Power Cable". Please click on the link below for steps to reseat the Thermal Diode Power Cable. Read the Safety Information in the same link prior to opening the system chassis. Dis-assemble the system chassis only if you are comfortable doing so. http://dell.to/13522yd Please reply if you  have further queries. Thanks and regards, Babita S #iworkforDell  For easy access to drivers, manuals and product updates, please visit our Support Site .

Hi Mathijs, The air temperature sensor that Dell installs on systems works without any user interaction. There is no need to turn it on or off or to configure any settings. The sensor comes configured for optimal running configurations no matter what climate you use your computer in. However, if the desktop halts with an “Alert! Air Temperature sensor not detected” Message During Startup, one of the solutions is to "Reseat the Thermal Diode Power Cable". Please click on the link below for steps to reseat the Thermal Diode Power Cable. Read the Safety Information in the same link prior to opening the system chassis. Dis-assemble the system chassis only if you are comfortable doing so. http://dell.to/13522yd Please reply if you  have further queries. Thanks and regards, Babita S #iworkforDell  For easy access to drivers, manuals and product updates, please visit our Support Site .

Thanks for your tip. However,

I have come to the following conclusion:

There is small chip on the upper left side of the front IO card, which I have damaged accidentally when cleaning the inside of the machine.

Temporary replacing the card with another IO card (from another machine) did resolve the error. (no error message Alert! Air temperature sensor not found).

However, I am now looking for another new/used IO card, to replace the item in the machine permanently.

Mathijs

Hi Mathijs,

Thank you for your reply.

It is great to know that the issue has been resolved and the system is working fine with the replacement part.

You can click on the link below to check for available spare parts for your computer. Otherwise, you can also speak with our representative in the Dell Spare Parts Department to confirm if the part is available. The contact numbers are available on the same link below after you select the country you are in.

http://dell.to/18X9D6X

Let us know if further help is needed.

Thanks and regards,
Babita S
#iworkforDell 

For easy access to drivers, manuals and product updates, please visit our Support Site .

Hi Mathijs, Thank you for your reply. It is great to know that the issue has been resolved and the system is working fine with the replacement part. You can click on the link below to check for available spare parts for your computer. Otherwise, you can also speak with our representative in the Dell Spare Parts Department to confirm if the part is available. The contact numbers are available on the same link below after you select the country you are in. http://dell.to/18X9D6X Let us know if further help is needed. Thanks and regards, Babita S #iworkforDell  For easy access to drivers, manuals and product updates, please visit our Support Site .

Unfortunately, the spare part is available (I have spoken with Dell customer service in the Netherlands), BUT only to business clients :emotion-6:

Dell unfortunately does not sell spare parts to non-business customers :emotion-7::emotion-6: (that is what was told by the Dutch representative).

The spare part number is TP004.

I am very disappointed, am not sad, not angry, but I am very disappointed....:emotion-45::emotion-6::emotion-9:

You can get it from Ebay and other vendors. 

Dell CN312 Optiplex 755 Mini-Tower I/O w/ Cable Panel (TP004 XT029).

Part Number TP004/ 0TP004 compatible with the following Dell Models:

OptiPlex 330, OptiPlex 360, OptiPlex 380, OptiPlex 580, OptiPlex 755, OptiPlex 760, OptiPlex 780

www.ebay.co.uk/.../230829231651

www.impactcomputers.com/tp004.html

The place that seems to have failed could be on the panel OR on the ribbon cable.

You can get it from Ebay and other vendors.  Dell CN312 Optiplex 755 Mini-Tower I/O w/ Cable Panel (TP004 XT029). Part Number TP004/ 0TP004 compatible with the following Dell Models: OptiPlex 330, OptiPlex 360, OptiPlex 380, OptiPlex 580, OptiPlex 755, OptiPlex 760, OptiPlex 780 www.ebay.co.uk/.../230829231651 www.impactcomputers.com/tp004.html The place that seems to have failed could be on the panel OR on the ribbon cable.

Thanks for the info.

The failure is on the panel to be exact: the chip on the marked R8 and R7 is damaged - cable is OK (tested with another card : problem was resolved).

I still think it's a pitty that Dell itself doesn't support non-business clients in delivering spare parts.. :( :(