Question about Compaq Presario 700 470024-192 Notebook

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Compaq presario 700 can only be turned on 6-7hrs after shut down?

Few weeks ago I posted a problem with a presario 700 that it would not power up. As time went by and i did several trouble shooting and i did not figure out what was going on. What i noticed is that the power light will come on only 6-7 hours after I shut down the computer. Then I would start it work regularly even try restart mode all ok. The minute I shut it down it will take several hours again for the power light to come on and be able to power up the pc. I did get a new bios battery but still no change. The main battery of course is dead but even without it in the pc the 6-7 hour start up sequence occured. Any tips??

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  • sxristi Dec 05, 2008

    Thank you for your input cosif. One more question. If the power system is burned up then why does it start up after 6-7 hours? it is strange. I do have a volt multi meter so i can check out your advice. do you know what specific i will measure? you said capacitors and coils around the power in the pc..

  • sxristi Dec 06, 2008

    I did look around and by chance i did find either a part cut off on one side on the motherbord near the charging lcd indicator. I am not sure what it is (it is silver cylindrical like a capacitor with the top flat circular section has on side painted a black chord and the reimaing part of the circle says 2 5 under 330 and under that 6A... is that a transistor??). I tried soldering it but there no way for me to do so. The holes were too little and I don't have the tools and the know how to solder something this small. However the pc did start 6 hours later as usual. Maybe this part would make it start normal...

  • sxristi Dec 08, 2008

    this is the part on top as you can see it has a black part and a written part 2 5 below 330 and below 6A.

    Here is another shot

    This part was near the power lcd of the presario laptop on the mother board top left corner and now it off the pc :( it fell off as i was putting the fan. It is hard to solder it because there are three tiny holes the that came off from the board with it ( green part :( )if you can see on the photo.

    Anyone knows what is this? a transistor?

    So now the pc powers up again after many hours and when i power it up it attempts to start up it goes through the boot up process for about 20 seconds and then just power cut off. any hints? is it this part or it could be something else i did when i took apart the board,

  • sxristi Dec 08, 2008

    thank you again. i did some securing with part and the computer started up again (the keyboard cable strip probably was not fully inserted or something like this) so now i got it to start again after 6-7 hours of charging. So the component you are telling me has to do with power source so maybe that is why i don't get power right away and it needs to waif for many hours. or maybe i see some shaking on the screen on the picture. anyhow soldering it will try but i think that the little holes cannot be soldered by me the pins of the "stabilizer" probably can because they are just like that of a capacitor even thicker. but the part that came loose on the part no way i can solder it there are three wholes . . . like these dots. :)



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Wow !!!

open it and check the power system (in the laptop) check for damaged capacitors or any other components that look damaged. Also if any check the coils (i think thats the english name) to be undisrupted, because they have a huge role in starting some power systems ...

If u have any electrical mesurement device use it to find out where the problem might be ...

The BIOS has no relevance to the manifestation that u describe, so it is not the issue!

Posted on Dec 05, 2008

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  • Cisf Dec 05, 2008

    some power systems (most modern ones) need an initial electrical power to power them selves up (i know it sounds stupid and impossibile but thats how it happenes). I am hoping that that is u;re problem also ... maybe the power system just takes an impossibe long time (7 hours !!!!) to get to the neaded initial value to start up ...

    u can try to move some fans of the computer by hand to create that initial impulse (works on desktops pc's!!!)

    anywhay even if this is not the case for u, cheching the components can not hurt, mayby is something as simple as an imperfect contact or a blown capacitor ...

    for the coils messure theyre resistance ... it's just a wire coiled up ... so it has to be unintrerupted (R different from 0)

  • Cisf Dec 07, 2008

    can u make a picture of the component ?!

    as for the soldering, u can try to attach a pin at the end of u're soldering device, so to have a fine hot end to be able to do the job... not the best thing to do but i think it will work :D

  • Cisf Dec 08, 2008

    i don't know what it is ! I also showed the pictures to a friend and he doesn't also. It can be anything ... a composed capacitor, a complex custom made component, a tiristor, a tension source ....

    the pictures are not that good, it u can take them again (check u;re micro macro settings on the camera) wold be grate ! Also show the back of the component...

    Anyway it sems as an important component so do try to solder it ! Try for example to solder some fine wires to the component and than to the motherboard, u can use a coil wire (it;s isolated so it doesnt matter if they tuch each other, and they are very thin so if there is a power surge, they will just breake and nothing bad will happen ...) ! just to see if it has any effect on the startup of the comp.

  • Cisf Dec 08, 2008

    my friend found out what it is! it's a stabilized source (power source)!!!

    so .... solder it ..



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