Question about Compaq Evo N610C Notebook

1 Answer

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

    ALREADY CHECKED CD/DVD, PULLED HARD DRIVE, AND FAN MOTOR SHOULD NOT COME ON UNTIL HEATED, THIS SOUND COMES ON COLD.



    WHAT DOES THE CCFLAMP INVERTER DO AND HOW MUCH IS IT AND HOW HARD IS IT TO REPLACE.

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1 Answer

Louie Role

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Hi,

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.

    Cheers.

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