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Samsung laptop - hard drive works but won't boot after DIY repair


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#1 Malthus101

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Posted 10 January 2018 - 06:19 PM

Samsung NP700Z laptop

Windows 7 Home

8GB RAM

 

So, a while ago this laptop slid off a chair onto the floor and cracked the back case and the main board/keyboard/palm-rest part.... The screen was fine.

 

It worked fine but opening and closing the lid put a lot of stress on the hinge area which was broken in places.

 

The battery was old and useless too, so I decided I would replace the battery, the keyboard part and the back case.

 

Found the correct parts on eBay, and followed a few YouTube videos.

 

It was actually pretty straight-forward, put it back together.. and powered up.

 

Nothing.

 

The fans were spinning but not the hard-drive as far as I could tell. Black screen. Nothing.

 

I went and bought an enclosure and tested the drive with my other laptop - it could read it and I backed up the files just in case.

 

So...... the drive works, the power is powering the fans and power light.. but the hard drive doesn't seem to work anymore in the old laptop.

 

 

I've tried  few fixes like holding the power button down for a minute unplugged, using mains power only, trying to attach a monitor to see if it's the laptop screen - nothing works so far.

 

It just doesn't sound or feel like the laptop is powering up at all when in the old laptop now.

 

 

I even tried putting it all back onto the old keyboard part but got the same result - this leads me to suspect I might have damaged the motherboard somehow.

 

 

Any ideas guys? My first post here, so thanks........

 

Malthus.



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#2 OldPhil

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Posted 10 January 2018 - 06:26 PM

Open it up again re check all connections, you may have dislodged something.

 

Phil


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#3 Malthus101

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Posted 10 January 2018 - 06:30 PM

Hi Phil

 

Yes I've taken out all the parts and replaced them several times over now - same issue.

 

Thanks.



#4 SleepyDude

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Posted 10 January 2018 - 06:37 PM

Hi,

 

Just to say that without the HDD the laptop must start and post with a message "missing boot device" or similar error.

 

If it doesn't do this then something is wrong with the board or connections.


• Please do not PM me asking for support. Post on the forums instead it will increases the chances of getting help for your problem by one of us.
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#5 Malthus101

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Posted 10 January 2018 - 06:44 PM

Ah, that's interesting - so "something" should appear on screen, even without the hard drive?

 

Just before I decided to finally fix the thing, last week, as I was opening the screen/lid, the screen would go black, then come back. It made me think that the broken hinge area might be cutting down on a cable or similar... but then it should be fine on an external monitor.

 

I unplugged the laptop screen and plugged in an HDMI monitor but it said no signal detected.

 

But maybe that's because the laptop isn't set up to extend onto a second monitor?

 

Thanks.

 

PS - someone said it could be the Bios battery? What do you think? (also, this laptop seems to have two round batteries, one glued in near the hinge and one that looks more accessible on the MB. I don't know which is the bios one.



#6 OldPhil

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Posted 10 January 2018 - 06:51 PM

The battery should not stop it from loading, but can screw up time date and several other things.


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#7 Malthus101

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Posted 10 January 2018 - 06:55 PM

OK.

 

I'm in the UK so am going to bed now but tomorrow I will try a sequence of trying to power up with ram removed, then ram back in but hdd removed etc... see if i can isolate the culprit before anything else.

 

Thanks!



#8 Malthus101

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Posted 11 January 2018 - 03:35 AM

Hello

 

So, nothing is posting. The screen is not coming alive at all. The power is running the fans, that is all, not the hard drive. (maybe it is, it's hard to tell)



#9 SleepyDude

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Posted 11 January 2018 - 04:24 AM

Hi,
 
Without the RAM the machine produce any beep?

• Please do not PM me asking for support. Post on the forums instead it will increases the chances of getting help for your problem by one of us.
• Posts in the Malware section that are not replied to within 4 days will be closed. PM me or a moderator to reactivate.
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#10 Malthus101

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Posted 11 January 2018 - 04:49 AM

No, I've powered up without battery, without  RAM, without HDD, without CMOS battery....... nothing. Just power light and fans.

 

Thanks.



#11 OldPhil

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Posted 11 January 2018 - 05:18 AM

The video ribbon may very well be shorting in the hinge area, unplug the ribbon at the board see what happens.


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#12 Malthus101

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Posted 11 January 2018 - 05:24 AM

Hi

 

I think I already did that, as I unplugged the laptop screen from the motherboard and plugged in an external HDMI hoping it might post to the external instead of internal monitor.

 

Thanks.



#13 Malthus101

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Posted 11 January 2018 - 06:39 AM

Question - if I remove the RAM, should something still happen when I power up?

 

Thanks.



#14 Malthus101

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Posted 11 January 2018 - 09:41 AM

I tried it with some RAM from another laptop and still nothing.



#15 DavisMcCarn

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Posted 11 January 2018 - 10:32 AM

Ever since the IBM PC (1982), the BIOS tests for 64 kilobytes of working "scratch" memory, tests the functionality of several key components (interrupt controller, DMA controller, keyboard, and several more), then initializes the video, displays the LOGO or boot messages, and begins to attempt booting.  If anywhere in those initial sequences, something fails, most PC's won't do anything that we can see and it is completely up to the BIOS as to whether or not we get an indicator of what is failing.  Some HP's will sequence the leds in a pattern to tell us what is failing, many Dell's have diagnostic leds on the front or back so you can lookup the pattern and see what failed; but, all too often now, there is nothing.

Take out the wifi card, remove the optical drive if there is one, remove the hard disk drive, put one stick of the original memory in the PC, and pray a little while you turn it on.  If there are any led's on the keyboard or the PC, look at them very closely and, if they flash in a pattern, write it down and post it back.

Otherwise, I think you have a brick.....  Sorry.


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