Question about Compaq Evo N610C Notebook

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High pitch noise

Whenever the laptop is turned on, it makes a high pitched squeal like a capacitor dischargind, someone told me that it was the dc converter board, if this is true where can i get the part for replacing this and is it easy to fix.

Posted by rudybear on

  • rudybear Nov 14, 2007





1 Answer

Louie Role

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For laptop repairs & parts, pls try here. Not really that hard a fix but major concern is how soon do you get the parts and how to confirm your diagnosis.

You may want to consider other possibilities such as:
1. mechanical problem (fan motor bearing, CD/DVD spindle, HD platter; and/or
2. CCFLamp inverter.

Hope this be of some help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Posted on Nov 14, 2007

  • Louie  Role
    Louie Role Nov 14, 2007

    Hi again,

    Just like in an LCD display panel, laptop's screen uses a Cold Cathode Florescent Lamp to provide the backlighting of the screen panel. This CCF Lamp is powered by a high voltage high frequency inverter circuitry that converts the laptop's battery power to suitable working voltage frequency (DC-AC). The voltage is high enough to sometimes cause arcing between terminals with a very noticeable sound (since high frequency). More often the inverter is inside the display /screen panel itself. It is relatively easy to replace since it is normally held by 1-2 screws or at times snap locked to the panel. It would have 2-3 plastic terminals/connectors. The biggest hurdle would be removing the front panel cover of the display screen. Prices vary depending on length of lamp it supplies, voltage/frequency and source/supplier. Inverters would probably cost anywhere between 30-50USD each. This site would be a good place to start. Sometimes it is just the capacitors that gets cooked and would need replacement.

    On the other hand, your post of a DC converter works on the same principle as the inverter but goes one step further. Basically it goes DC-AC-DC (multiple outputs). The initial DC is your battery which is converted to a not so high frequency AC and then transformed to multiple DC voltages (1.3+*/-, 3.3, 5.0, 12.0 & others) for use of the various devices including the motherboard/CPU.

    Hope that this be of additional information.




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