Question about Dell OptiPlex GX620 PC Desktop

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When in the setup section looking into pc setting cooling fan goes on to high speed then pc shuts down, then when I reboot and the screen comes up tells me that there was a thermal shutdown and ask me to press f1 to continue or f2 for setup I just got this used unit and I am still just checking it out it has the a11 bios and I see no heavy windows use when the pc has booted meaning using task manager. Dell OptiPlex GX620 PC Desktop Service Tag: CPSQV81 System Type: OptiPlex GX620 Ship Date: 11/17/2005 Dell IBU: Americas Quantity Parts # Part Description 1 W8400 Processor, 80547, Pentium 4 Prescott Dt, 630, SKT-T, Male 1 Y9628 INSTRUCTION..., DEVIATE-TO-MCSF-L5.5 0 149DF INFORMATION..., PREPARATION MATERIAL..., DEVIATION..., PRECISION WORKSTATION..., INCREASE..., #2 1 5120P Cord, Power, 125V, 6Feet, SJT..., Unshielded 1 C8649 KIT..., Mouse, UNIVERSAL SERIAL BUS..., 2 Button, Lead Free, Optical, Primax Electronics Ltd 1 N6250 Keyboard, 104, United States Universal Serial Bus Multi-media, Liteon 2 F6761 Dual In-Line Memory Module, 512533M, 64X64, 8, 240, 1RX8 1 U9565 Assembly, COMPACT DISK READ WRITE/DIGITAL VIDEO DISK DRIVE COMBO..., 48X Half Height, Toshiba Samsung Storage Technology, CHASSIS 2005... 1 DC164 Kit, Documentation on Floppy Disk, Software, PowerDVD, 5.5 RLOB 1 T6116 Display, Flat Panel Display, 19 Dual Voltage, 1905FP, Midnight Gray, DELL AMERICAS ORGANIZATION... 1 H9142 Card, Graphics, 128, X600 OUGA3, Full Height 1 XD673 HardDrive, 80GB, S2, 7.2K, 8M, Lead Free, Samsung 1 DD131 Assembly, Floppy Drive, 1.44M SONY, CHASSIS 2005..., Lead Free 1 WD766 Kit, Software, Overpack, WXPPSP2BCDWD, English 1 J8181 INSTRUCTION..., DEVIATE-TO-MND-L5.5 1 J7109 Assembly, Heatsink, Shroud Mainstream, Matrix, Smith, Mini Tower 1 Y8343 ASSEMBLY..., CHASSIS..., MATRIX,SMITH,MINI TOWER..., OPTIPLEX..., GX620, PWA INTEGRATED... 1 J8182 INSTRUCTION..., DEVIATE-TO-MSMT-L5.5 1 D9899 Assembly, Speaker, 1W, 28MM 12CBL, Lead Free 1 TC935 Kit, Compact Diskette, Driver Resource Compact Disk Optiplex, V2 1 J8461 Assembly, Cable, Video, Lead Free 0 83535 INFORMATION..., PART, ADVANCED TECHNOLOGY ATTACHMENT PACKET INTERFACE..., DEVICE 1 T4860 Guide, Product, Information Desktop, AMF/BCC

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  • info20383 Sep 13, 2009

    ok how do I "reset your motherbord settings to factory defaults"

  • info20383 Sep 13, 2009

    Hey thanks I was doing that while I was waiting for a reply here is what I found....

    It was a recond pc well the tech who worked on the unit had left one screw lose and 1 not even tight on the other side so the heat sink was not in full contact thus creating an overheat condition so I will except your reply just because your replies were correct if that was what I would have needed but have a great day ....


  • info20383 Sep 13, 2009

    This tech was right on target the reason I had come to you was because of all the write ups I found online for gx620 overheating and your tech steered me in the correct procedures so thanks....

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  • 4,281 Answers

It is becaseu of heating event on motherbord for that First reset your motherbord settings to factory defaults.
Remove dust from all circuit of motherbord.
Reconnect RAM memory.
If still face issue then you have to need put extra fan in cpu and change heat sink fan upon processor.

Let me know if you need more assistanse.
Thanks.

Posted on Sep 13, 2009

  • For RESET motherbord settings to defaults pull CMOS cell from motherbord for 10 minutes so all settings are defaults.
    CMOS cell is round cell.
    Let me know if you need more assistanse.
    Thanks.



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Posted on Jan 02, 2017

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I have a 2006 buick lucerne 3.8 v6 cxl.my coolinf fans dont come on .i need to know how to change the relay and the fuse.


Your vehicle cooling fan's are controlled by three relay's , couple of fuse's an the PCM - engine computer . The engine coolant temp. sensor is a input to the PCM , when engine temp get's to 212 the PCM will turn on the cooling fans in low speed . Checking to see what the actual temp is with a scan tool an a infrared thermometer at the thermostat housing ,an looking up the specification's in a service repair manual is how to diagnose . Not guessing an replacing parts . Plus learning how the cooling fan's work .
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The engine cooling fan system consists of 2 puller type electrical cooling fans and 3 fan relays. The relays are arranged in a series parallel (S/P) configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block. The ground path is provided at G104.
During low speed operation, the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the cooling fan S/P relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the ECM supplies a ground path for the high speed fan relay and the cooling fan S/P relay through the high speed cooling fan relay control circuit. This energizes the cooling fan S/P relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time, the high speed fan relay coil is energized closing the relay contacts, and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit, to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
The ECM commands the low speed cooling fans ON under the following conditions:
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