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My Home PC Repaired

By on August 5, 2015
home pc repair








My home PC is an old model- HP Compaq Model HP d530 CMT (DN276S).

my home pc repair

It suddenly started working with a very slow behavior, so I restarted it and when it started, look at the error message showed on the display.

home pc repair2

The message is the error 511 which means there is no CPU fan connected and this is very dangerous, because the Microprocessor in not cooling adequately and it can be destroyed by the heat.


When the Microprocessor fan was checked, I found that it was not spinning. First thing done was to disconnect it from the CPU Fan socket and connect it into the chassis fan socket (the rear chassis fan was disconnected previously and it was spinning) and it really did not spin at all.

home pc repair 3

So till here we can conclude the Microprocessor (MP) fan was out of order. Another fan was gotten to substitute the broken one, but this time when it was connected into the socket in the Motherboard it really did not spin, but when it was connected into the chassis Fan socket it really turned well. It means the CPU Fan socket was not getting the voltage to supply the fan.

Therefore a PC male-female of four-ways of a rear fan was obtained to substitute the original connector of the MP fan (which was cut previously), look at the photo below.

home pc repair 4

At this time the male socket of the rear fan was plugged into one male socket of the SMPS, and the positive and negative terminals were soldered and isolated with adhesive tape as shown in the photo below:

home pc repair 5

The fan is spinning at full speed now, so Mission accomplished.  



This article was prepared for you by Humberto Rodriguez, one of our ‘Master Authors’ from Cuba.

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Note: You may check his previous repair article in the below link:




  1. Albert van Bemmelen

    August 5, 2015 at 2:06 pm

    Glad you could Fix your not working PC with CPU Fan problem Humberto. But I take it you were not able to find what component was defect that caused the problem on your Motherboard? Maybe a broken Copper connection to Fan Controller or a defect Mosfet or something like that? There must be a reason that caused it? It would of course help a lot if you had a schematic of this HP Compaq Board. If I find something that could pinpoint in helping to find the exact reason, I will let you know.

    • Albert van Bemmelen

      August 5, 2015 at 2:39 pm

      I have found some circuit info on a HP_520_LA_3491P_VOLGA_2.0 and a HP_540 Board. On first board the 2 pins PWM controlled FAN circuit consists of a 3Volt TC7SH00FU_SSOP5 chip that gates an AO6402_TSOP6 Mosfet on 5V that controlls the Fan (protected by an extra Diode and a Zener Diode). On a HP_540 Board these are TC7SET08F + AO3409 Mosfet without the extra Diodes in the previous mentioned 2 pin circuit, and this circuit is a 3 pin FAN output connector. And here both chips are 5Volt supplied. Hope this helps finding the real cause.

      • Humberto

        August 13, 2015 at 2:09 am

        Yes, I'll try, but if you know any website to download the Schematic Diagrams of Motherboards.

  2. Aggelos

    August 5, 2015 at 2:13 pm

    Nice fix
    Are you still getting the error message 511 at startup???
    Did you ignored it through BIOS setting???

    • Humberto

      August 13, 2015 at 2:11 am

      Yes, but it gives me the option of pressing F1 and continue. The CPU is cooling anyway.

  3. Robert Calk

    August 5, 2015 at 7:49 pm

    Good job Humberto getting your fan to working.

    • Humberto

      August 13, 2015 at 2:12 am

      Thanks Robert, it was a solution because this PC is a very good one, and HP COMPAQ is one of my favourite brands

  4. Yogesh Panchal

    August 5, 2015 at 9:27 pm

    Thanks for sharing but same question As Aggelos.

    • Humberto

      August 13, 2015 at 2:14 am

      Ok Yogesh, look at the answer given to Aggelos.

  5. reza

    August 8, 2015 at 1:08 pm

    hi Humberto
    thank u .

    • Humberto

      August 13, 2015 at 2:15 am

      Ok reza, you are welcome


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