Question about Compaq AlphaServer DS10

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DS10L AlphaServer CPU Fan Failure

Symtoms:
System powers on but fails the self test and wont reach the SRM prompt.
Event and FAN LEDs are lit

Actions so far.
Retrieved status from RMC with CPU Fan: FAIL indicated.

Replaced CPU fan assembly with out any luck.

I have o-scoped the leads from the CPU fan and I'm getting
12VDC on the red wire.
5VDC pulse on the yellow wire
~0VDC on the blue wire

I'm looking for any further trouble shooting ideas.

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The answer is to get hold of a high-speed case fan. I used a Scythe s-flex 80mm which has a +/- 5% RPM of 2800. rearrange the pins or use a choc-block such that yellow -> black, red -> yellow, black -> red. Hey presto.
Works for me.

Posted on Jul 04, 2010

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When a computer completely fails to boot or to provide any sort of power on self-test (POST) beep codes, the cause is either a hardware failure, lack of power or a bad connection.


To solve these problems, it helps to start with potential environmental causes first, such as a problem with the AC power being supplied to the computer.


From there, a good rule of thumb is to simply start disconnecting items from the computer one at a time until just the CPU, motherboard, RAM and power supply remain connected, and then swapping in known good replacements for them.


Test the AC power to make sure there is power to the outlet. Inspect the back of the power supply to ensure the power cord is fully seated, the power switch is on and the voltage setting is set to the right voltage, which is typically 110 volts.


Inspect the inside of the computer for any signs of burned components, such as capacitors or integrated circuits that are deformed or discolored, and replace the affected expansion card, motherboard, drive or other device if damage is located.


Verify a proper connection for each expansion card, cable, drive and stick of RAM by disconnecting and reconnecting each item without removing it from the system.


This can sometimes clean corroded or loose contacts and solve minor problems that prevent the system from booting.


Disconnect the drives and remove all of the expansion cards except for the video card, and try to boot with a bare system composed of only the power supply, motherboard, CPU and cooling fan, RAM, and video.


Attempt to start the computer again. If the system boots, reinstall the removed items one at a time until the system again fails to boot, and then replace the component that is causing the failure.


If the bare system fails to boot, swap in known good components for the motherboard, RAM, video card, power supply and CPU until the system boots.


Swap components into a working computer one at a time until that system fails to boot in order to locate problem components.


Hope this helps.





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If computer does not start normally, use this checklist to identify specific symptoms and take the recommended corrective actions to resolve the problems.Perform a Hard Reset Do these actions first to clear all temporary setting before troubleshooting the problem.Disconnect all peripheral devices and remove all USB devices and media cards Disconnect the AC power adapter, remove the battery, and then press and hold the power button for at least 15 seconds to drain residual charge
  1. Reconnect the AC power adapter (do not connect the battery), press the Power button and look for the LEDs to blink or glow, and listen for the sound of a disk drive and fan turning.
Perform each recommended corrective action and then attempt to restart the computer.Symptom 1: LED lights do not glow, display is black, no fan or drive sounds are heard, and computer does not startIf LEDs do not glow or blink when AC power adapter is attached and power button is pressed, there is no power available to the notebook.
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  • Connect a different battery and disconnect AC power adapter, then restart notebook.
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Symptom 2: LEDs blink or computer beeps but does not start Blinking LEDs or beep tones indicate a hardware failure during the pre-start up testing.
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Symptom 3: LEDs glow, fan noise may be heard briefly, display remains black, and computer fails to startup or boot Usually occurs if a component is installed incorrectly, or there is a device conflict or failure.
  • Connect an external monitor to check if the problem is the built-in LCD display or graphics card.
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Symptom 4: Computer may display an error message on a black screen during startup or boot
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  • Search www.hp.com for terms in error message.
  • If possible, turn on power, press F10 to enter BIOS mode, do the corrective actions listed under Symptom 3 to run memory and hard drive tests.
Symptom 5: Computer displays a blue screen or continually re-starts After an error message is displayed, you can usually bypass the error and continue to run the notebook in Safe mode to install an updated BIOS or driver.
  • Search www.microsoft.com for terms in error message.
  • Search www.hp.com for terms in error message.
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Symptom 6: Computer displays the Windows logo screen and stops respondingIf no error message displays, turn on power, press F8 to enter Windows Advanced boot options ,and select Disable auto-restart to view error message.
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1 Answer

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Hi,

I am not very familiar with Alpha. Do either of these manuals help? Here is a Console Reference and a Console Firmware guide that talks about it.

Thanks

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1 Answer

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Hi tenfive64,

Try another fan in the cpu power slot, to see if there is no power getting to that source. If the fan turns on, well! Something ain't right with the fan. If it doen't then you'll need a power extension connector to reach for another fan power source on the board. DON'T hook it up to a non-fan power source, you will fry the fan, if not the board.

Good Luck,

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This may work however i think by ignoring the sound of the Fan you might have destroyed the cpu and the motherboard.If you can try the processor in another machine you might just have to replace the motherboard only.
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:)

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