Question MOBO only starts without cmos, battery and psu

[Berseker]

Hello hello

I ran into an issue during the last days and need some bigger/more experienced brain than mine for the solution.

I own an asus laptop r751jb and the motherboard slowly fried lately so I replaced the MOBO and ordered a new 8gb ram to upgrade a bit since the configuration is fine for me.

The MOBO arrived first, I installed it and it worked with the 2 original ram sticks ( 2gb + 4gb ). I used it for a few weeks, then the new ram stick arrives and I try it, and the laptop doesn’t start anymore...

I try troubleshooting as far as I can by myself and end up having all the rams working ( I keep the new 8gb + the original 4gb ) and the laptop starting only when the touchpad is not connected and only after every source of power ( cmos, battery and psu ) have been disconnected from the MOBO before. After further investigation I realize that I screwed the touchpad connector with its little metallic paper/pin on the MOBO’s side..... fine I can use a mouse.
And the power button which has a separated connector to the MOBO doesn’t have any effect and the only way to turn the laptop on is to unplug battery, cmos and psu and replug the psu which starts the laptop right away without using the unresponsive power button. Since the power button doesn’t turn on/off the only way to turn the laptop off is to unplug the psu and wait for the baterry to empty (if it is plugged otherwise it turns off righ away).

I’m left with the machine without CMOS ( I don’t really need it after all, am I right?), without touchpad ( I can manage ) and only the battery and the psu to control the power on/off.

My question here is what happened to make the motherboard to be discharged to be able to restart? Is it safe to go without a CMOS? Could it be so that the touchpad connector fried something in the MOBO and at the same time disabled/fried the other connector for the power button? I’ve read in someother posts that disconnecting the CMOS resets the BIOS, could that come from the BIOS then?

Other than that I can set the laptop in sleep mode whenever I’m not using it to avoid emptying the battery everytime.

Thanks for any idea, advice

 

[Lutfij]

You're definitely going to need the CMOS battery since that is what keeps the time keeper on the board. How do you think the time in your BIOS remains in check even when you shutdown and pack up your laptop? Also the CMOS battery keeps the settings in your BIOS, intact.

From my understanding, after reading through your post, it seems like you didn't follow the proper procedures to disassemble and reassemble the laptop. It could be you've taken out more than you were supposed to remove or disconnect.

You might want to look at a local repair shop to see if the laptop's connections can be salvaged. Also, did you update the BIOS after you got the replacement board? Did you pick the right board to replace the one that got fried? Why would a laptop's board get fried? You might want to look at your house's electrical wiring as well.

 

[Berseker]

I don’t mind not having the right time on that computer so if doesn’t create any other issue I can live without the CMOS I guess and stay with the manufacture BIOS settings.

Maybe I did something wrong when I reopened it but I’m pretty sur I did it the correct way. And the motherboard is not identically the same, it is the same serie but exactly the same precise model. Everything worked well though after I installed the MOBO so I don’t think it would come from that and I havn’t touched or updated the bios on this new MOBO as it’s running well for me and don’t need extra clocking on it, should I try to update and see if it changes something?

The Last MOBO slowly started erroring more and more for a few months while using the laptop until it wouldn’t turn on at some point.

Thanks