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    Compaq Presario 2500 no power, dead no led lamps

    Discussion in 'HP' started by Johny Bravo007, Jan 10, 2014.

  1. Johny Bravo007

    Johny Bravo007 Newbie

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    Hello,
    i have a Compaq Presario 2500 that has no power. The laptop is totally dead. Everything happened after disassembling
    and thermal paste changing. Previously the laptop had some heating issues, since this laptop is pretty old and was never
    opened and cleaned. I decided to disassemble it and perform a cleaning and thermal paste changement. The CPU was pulled out and sticking on the heatsink since the old compound was totally dried out and it literally glued it onto the heatsink. After reasembling laptop totally dead. After 10 minutes the battery charge led starts to lightning, but laptop will not turn on. I measured several points on the motherboard, and i was able to measure some voltage presence. Has somebody a circuit diagram ?
    It is a rare motherboard that has no fuse near the DC Jack. I noticed only 2 fuses on the entire board.
    F1 has a sign p10 and is near the switch board port located, the other one is placed more near the DC Jack and is white colored and has a sign 2, which is standing for 2A ? Or am i wrong ?
    I don`t know further, has someone a suggestion or a circuit diagram ?
    The laptop has no real value, and i will not invest into a new motherboard, so i hope i will get some advices from you guys in order to get this laptop to work. Btw i tried another CPU too, but the laptop has the same condition with no changements.
    Here is the motherboard model : DAKT9DMB6F1 KT9D

    Btw : today i found some time to measure and to take a detailed overview on the board, and i found out, that the thin film fuse that has a p10 sign on it, has no continuity when i take the board chasis as ground, it has some continuity only with 2 or 3 components that are nearly grounded on it. Fuse 2 has continuity, also both fuses have no stand by voltage.

    Thanks in advance, and i hope for some answers
     
    Johny Bravo007, Jan 10, 2014
    #1
  2. simonmpoulton

    simonmpoulton Notebook Deity

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    Check the 8 legged mosfets for voltage start near the power jack and work your way in. If pin 4 has voltage on you should have power on all other pins (pin 4 is the one on the opposite end to the spot on the mosfet)
    If you find one with no power on one side then you've found the problem.

    Given the age of this machine it probably isn't worth spending to much time looking into it.
     
    simonmpoulton, Apr 14, 2014
    #2