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TimmoUK
05-30-2018, 09:26 AM
Hi,
First post here after doing days of searching as I need some help. I replaced the battery on my G751JM after watching various posts how to do it and put everything back together and hit the power button and I get nothing on the screen. It doesn't post and there is no HDD activity light at all. I've tried doing the reset without the battery in etc and I've tried reseating the RAM and the hard drive but no joy...I'm guessing there is something preventing it going through POST as there are no flashing lights or beeps at all. Has anyone had any similar issues or can you offer me any advice as I am sitting with a brick now....
I've hooked up the Hard drive to another laptop and have salvaged my files etc but I don't know what next to try to get the G751 working. I don't think I've damaged the cable between the motherboard and the screen and I've taken off the bezel and checked the end that connects into the screen and that looks fine.
The only thing that I may have done is disconnected the screen at the motherboard end before disconnecting the battery...Would this have fried something? I'm kind of stuck right now so desperately looking for any suggestions or advice....I had an old alienware that lasted me for 10 years and replaced with this that I've only had for 3 or maybe 4 years...
All help and suggestions appreciated thanks

TimmoUK
05-30-2018, 09:32 AM
I should also mention that the charge light comes on fine along with the light bulb light and the aeroplane light but no hdd activity light. I took the laptop apart and removed the battery and it was open on the table for 2 days with no power before I got the new battery...I doubt this would have caused an issue but I have read about the CMOS battery although that is buried under the motherboard so I haven't been there yet...

Sanctrum
05-31-2018, 05:28 PM
Have you tried connecting to external monitor/tv set?

Clintlgm
05-31-2018, 05:59 PM
Hi,
First post here after doing days of searching as I need some help. I replaced the battery on my G751JM after watching various posts how to do it and put everything back together and hit the power button and I get nothing on the screen. It doesn't post and there is no HDD activity light at all. I've tried doing the reset without the battery in etc and I've tried reseating the RAM and the hard drive but no joy...I'm guessing there is something preventing it going through POST as there are no flashing lights or beeps at all. Has anyone had any similar issues or can you offer me any advice as I am sitting with a brick now....
I've hooked up the Hard drive to another laptop and have salvaged my files etc but I don't know what next to try to get the G751 working. I don't think I've damaged the cable between the motherboard and the screen and I've taken off the bezel and checked the end that connects into the screen and that looks fine.
The only thing that I may have done is disconnected the screen at the motherboard end before disconnecting the battery...Would this have fried something? I'm kind of stuck right now so desperately looking for any suggestions or advice....I had an old alienware that lasted me for 10 years and replaced with this that I've only had for 3 or maybe 4 years...
All help and suggestions appreciated thanks


Well if everything was working before you took it apart, then you have to suspect a damaged connector or cable ribbon cable where it goes through the hinge would be most suspect as I understand it very difficult to get into the correct position on reinstall. I don't think it your BIOS Battery

TimmoUK
06-01-2018, 08:54 PM
Thanks for the input....I have tried connecting to an external monitor but as I don't get any HDD activity light I don't think its getting far enough...All the ribbon cables seem intact and the only one that looked suspicious to me was one of the 4 that connect to the keyboard which looks like it has a serious crease in it but I don't know if that could be causing the problem or not as its only going to the keyboard?

Clintlgm
06-01-2018, 09:31 PM
Thanks for the input....I have tried connecting to an external monitor but as I don't get any HDD activity light I don't think its getting far enough...All the ribbon cables seem intact and the only one that looked suspicious to me was one of the 4 that connect to the keyboard which looks like it has a serious crease in it but I don't know if that could be causing the problem or not as its only going to the keyboard?

Yep, a keyboard is required for your BIOS to complete hardware check to boot, it the same as not having a CPU or GPU or RAM Keyboard is required I would replace that damaged cable and hope that all that's been damaged.

TimmoUK
06-01-2018, 09:50 PM
I've just been looking through the assembly and disassembly pics and guides again and it appears the thin cable that I mentioned may just have an extra crease in it although I'm not 100% sure...The only other thing I notice from looking at the pics and videos is that I am not 100% sure whether I had the battery connected at any stage whilst the screen was not connected at the motherboard end? Could that have caused an issue if that was the case? I just notice that on the assembly vid I just watched the guy connects the battery after the screen and I may have done it the other way around..Could that have damaged something?

TimmoUK
06-01-2018, 09:52 PM
74063

the cable I am talking about that had the crease is the narrow one on the far right in that pic...

TimmoUK
06-02-2018, 09:50 AM
Well I have her totally stripped down again now and the screen out and everything....Everything seems to be in place and even that little ribbon cable that looks creased is just for the side number pad i guess as the main large one looks ok...I'm wondering is something fundamental is fried on the mobo ? Would connecting the battery without having the screen hooked up damage anything? Just seems very bizarre that the fans won't even spin up let alone the hdd? Even though its getting power? What am i missing?

SkyMajor
08-13-2018, 07:37 PM
Dear #Timmo,

Did you solve the problem with your laptop?
I screwed up mine one yesterday the same way.
Nothing was damaged, everything looks perfect, and it wont post.
Any advise?

ciccio80
09-01-2018, 09:39 AM
Hi, if you unplugged the screen cable BEFORE unplugging the system battery, the motherboard circuits were still under electric tension and it could be that you ‘fried’ the motherboard.
I would suggest to take the notebook completely apart and remove the SMALL BIOS BATTERY for a minute to reset it (you’ll find this battery on the same side of the motherboard where the GPU/CPU are located). Then carefully put the whole thing back together and see if it boots. If not, you have most likely bricked the mobo.

Source:**that’s how I resolved the same problem. Fortunately my mobo wasn’t damaged and the notebook restarted after battery reset.