Conference mvblab::alphaserver_4100

    I'm sorry, but I'm not sure I understand what you're asking.
    
    If you're saying you see no LEDs on the PCM, have you tried swapping
    this part? Do you see anything on the OCP display? What about on the
    CPU module LED?
    
    Are you saying the Service Manual is helpful or is not helpful? If
    not helpful, would be good if you could provide feedback on what
    needs improvement.
    
    BC

    
    
    Thanks for your response,
    
    I don't see anything  beside the light in the OCP, ( no messages )
    The Leds on the pwr module and cpu mod. are OKE!!!!!! thats the funny
    part of it.
    What about this Service manual, the troubleshooting parts is not
    good, its only leds oke or not oke but for example in my case whats now
    A nice flow chart with step by step by power on whats happend in the
    machine should no be bad, then you get any idea where to look.
    
    The FS- Engineer swap everything in this machine without a solution.
    
    
    Cor

    From .0 I would read that the problem being experienced is the one
    which is the most difficult to diagnose ie
    
    OCP Display lights up but no data is displayed and the system is hung.
    
    These symptoms are caused mostly by B3050, B3040 or 54-23803 faulty or
    connector damaged modules but I have seen CPUs cause this symptom as
    well.
    
    Les

    Note 38.2 has the latest SROM / XSROM Functional spec. It goes into
    great detail about what the power-up steps are.
    
    If no OCP display, have you checked/tried the following:
    
      1. Made sure that the intensity on the display is not all the way
         down? Older OCPs have a little knob above the LCD display. The
         newer ones have a small hole that can accept a small screwdriver.
    
      2. Checked for a good OCP cable connection?
    
      3. Looked at the PCI Bridge (Horse) module's STP LED? Does it come
         on? If the CPU LED is on, one of the next things the SROM goes out
         and tests is IOD0 (simple loopback test). No CPU cache or system
         memory is involved yet.. Then onto programming the junk I/O
         devices on the PCI motherboard (Saddle) such as the EISA bridge,
         the COMBO chip, the IIC/OCP logic. Still no cache/memory involved
         so these would not be suspected to be faulty..
    
      4. Have you tried connecting a serial line to COM1 to see if you get
         any output? [Perhaps the rest of the machine is okay and the OCP
         is broken?] If an NT machine, power-up and then wait a minute or
         more (even longer if gobs of memory) and then press <CR> on the
         serial terminal a few times - console may be set graphics (VGA).
    
      5. If none of the above provides any clues/fixes, then I'd suggest
         swapping the OCP.
    
      6. Finally, the OCP hangs off the IIC bus which runs throughout the 
         system. If a faulty IIC device is taking down the IIC bus, then
         this could lead to no OCP display (though I've never seen this)
         without some accompanying COM1 printing by power-up code.. IIC
         devices live on the following modules: OCP, CPUs, motherboard,
         PCI Bridge module (Horse), and PCI motherboard (Saddle).
    
    Let us know what you find..
    
    BC
    
    D CPU STP LED to see if it comes on? [How many CPUs
         in this machine?]
    
      4. 

    
    
    Thanks for your info, I will try all your tips at tuesday because
    monday is in Europe a public holiday.
    
    Have nice weekend and thanks
    
    
    Cor

    Re: .2
    
    Which modules/parts have been swapped already?

    
    
    Re -4
    
    To answer your questions:
    
    In the machine is only one CPU
    
    1. The intensity of the OCP - Display was oke
    2. Cable oke
    3. Leds are oke on all the modules no failure
    4. There is non output to a terminal by power on
    5. OCP was swapped
    6. All modules wer swapped except the Server Control Module
    
      I swapped the Server Control module and this fixed the problem
      very funny problem, that this module hangs the whole system.
    
    Thanks to everybody for his inputs
    
    Cor