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Notebook PC won't power on


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#1 amateur guru

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Posted 18 April 2011 - 03:54 PM

We have been asked to repair an HP Pavilion dv2000 series Notebook PC (dv2945se). According to the owner the notebook was working and then it just stopped. Then it would not come back on; at all. After that, it sat for four months.

Problem: It won't power on. There are no beep or light codes. There is no fan. The screen remains inactive.
The AC adapter is providing power and the RTC battery is good. We know this because the LED at the DC jack lights up as well as the blue "charging" icon on PC face (not the monitor as that isn't doing anything at the moment). These lights only show when the adapter is connected.
The main battery was bad (could not be recharged) so we replaced it with a new one. We have tested the PC with the AC adapter and no battery and with the battery and no adapter. We have tried a reset by unplugging the device and removing the battery and then pressing the power button. That didn't work either.
From all of this (plus research on the issues with this model of HP notebooks) we believe that the problem is likely the system board. We have seen online that the problem could be the nVidia graphics card but we're not quite sure how that would shut down everything.
Is there anything else we should examine before presenting the option of a new motherboard/Notebook to the owner? Any input would be greatly appreciated.
"To err is human... to really foul up requires the root password."
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#2 MrBruce1959

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Posted 19 April 2011 - 02:50 AM

Besides a possible cold solder joint or faulty ZIF connector, a bad chip on the motherboard for the graphics accelerator can very well cause a whole system shut down if in fact the chip has shorted out internally and has caused other component damage in the process.

Using a VOM meter on the circuits that supply power to the mainboard and checking for a source of current would help determine if the current is in fact making it into the rest of the system.

Have you tried this method yet to determine if the fault is not in those circuits?

Bruce.

Edited by MrBruce1959, 19 April 2011 - 02:51 AM.

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#3 amateur guru

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Posted 20 April 2011 - 09:14 AM

Mr. Bruce we do appreciate the help and advice. It seems that the graphics accelerator is shot and that it took a good portion of the motherboard with it (apparently not an unusual problem with this model laptop according to HP). Thanks again for the advice.

BC :thumbsup:
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"There are 10 types of people in the world: those who understand binary, and those who don't."

#4 MrBruce1959

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Posted 20 April 2011 - 04:08 PM

No problem, sorry to hear you fell victim to a failed embedded component.

Good luck with your next motherboard purchase and thanks for keeping us updated.

Bruce.
Welcome to Bleeping Computer! :welcome:
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My Career Involves 37 Years as an Electronics Repair Technician, to Which I am Currently Retired From.

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