Question about Compaq Presario C700T Notebook

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Hello, a friend recently brought me a Presario c700 asking me to fix it. When I inspected it, it has occured to me that the entire thing looks completely fine, inside and out, I've checked this thing with a magnifying glass, every square inch, I've checked for loose connectors, cables, etc. EVERYTHING. When we turn it on, (the power jack is NOT broken.) we hear it boot up, the CPU fan is working, everything is working, except we are not getting past the initial boot up process, the screen remains UNLIT and then randomly the computer will just shut down. Also, occasionally, very rarely, we will get a picture of the laptop booting going into windows xp, and then suddenly BAM nothing, power cuts itself off, even though there is a blue charge light, and the charger is working, we've tried another charger, and another battery, and another HARDDRIVE just to get it to work. the screen / power adapter is not broken inside because it was getting a picture and we took it apart to check it for shorts or burn marks, or anything noticeable at all, any discoloration. nothing. So is it a short somewhere? maybe a low voltage short? or perhaps the motherboard is bad but we simply cannot tell by looking at it? would i need to hook a volt meter to each capacitor to find it? it's really wierd problem. at first we thought maybe the screen was bad, but its not, nothing seems bad, it just wont boot, the power cuts itself off like its overheating but its not, sometimes it just stays on for several minutes but no picture, could it be a couple bad capacitors in the video display circuit? please reply with as much information as possible, this would be of great help to us!!! thanks.

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  • xexorian Oct 22, 2009

    actually, I think it is the motherboard itself, but we do electronics repair at my shop, so I think I just need to give in and take the time to check all the circuits on the board to make sure there's not a dead short on any leads, gonna take several weeks to solve. there's no overheating problem, all the fans work, there's tons of heatsink on it, we already tried that, it's nothing obvious.

    I'm still looking for help on this one -- we had 2 more come in, same problems, unidentifiable by the obvious, they come on, they turn off if we hit the button, but usually they just shut off after 3 sec, with no sign of power on the backlight of the LCD, like normally you see the dark black/blue glow when an lcd turns on with no picture, that isnt even there, SOMETIMES it is, but 99% of the time it doesn't come on.

    I'm beginning to think its the motherboard's bios or flash ram built in is having some wierd incredible issue sending a signal to the screen's power adapter or display circuit, not sure how it works 100%, other guy i work with fixes those usually.

    I think it's the video circuit capacitors have gone bad, just a hunch, the capacitors on this motherboard are very tiny, and dont have etches to show when they've "popped" or swollen and gone bad, I'm guessing its something like that, which is still easily fixable.

    most problems with computers are physical when its something like this, I'm guessing it still is physical, and not some wierd firmware/hardware issue that arises in these models.

    I only wish HP's tech department would tell us these real wierd issues and how/if they fix them themselves. (of course they probably don't, since they have a robot build all the electronics, it's probably never checked by a human, just assembled and shipped.)




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What I recommend is you remove everything you could possibly remove from the laptop (HDD, mems, cd rom, wifi cards, etc) just to check if it will turn off even when it's not booting or posting. Try turning it on with just the charger and WITHOUT the battery and see if it stays on. If it doesn't, then most likely the mobo itself is the problem.

Posted on Oct 06, 2009

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Check your temprature,if your laptop gets to hot,it will shut down. Get heatpaste and put it on your prosesor and clean your fans and heatshink.

Posted on Oct 06, 2009

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