ASUS X502C charging, but won't power on

[Sadistic Taste]

Ok, so I have this laptop which charges ok, but has stopped powering on. This has happened before, and removing the motherboard and puting it back has worked in the past, but this time it's not working.

When it does work, you can reboot/restart/power off/on etc, but if it's left off a while, or goes into sleep, it just stops turning on again.

Im not sure what's going on, I hope someone can help.

[dj_ricoh]

Re: ASUS X502C charging, but won't power on

Bios failing or low bios battery.

[Sadistic Taste]

Re: ASUS X502C charging, but won't power on

Hi dj_ricoh, funny you should say that. As the last time this happened, removing and reinserting the cmos seemed to do the trick, although it didn't work today.

I checked the voltage on the battery and it reads 2.99. Should I replace it anyway? If I manage to get it to boot again, I'll update the bios.

[Sadistic Taste]

Re: ASUS X502C charging, but won't power on

Ok, I replaced the BIOS battery, but still won't turn on. Would replacing the BIOS chip be the next step?

I can only find a replacement chip for X502CA, are these the same?

[dj_ricoh]

Re: ASUS X502C charging, but won't power on

I hope you wrote a new bios on that chip.
Its useless if you just take it from another board and place it on yours.

Rewrite it.

Ok power button must have 3.3v and must drop when you trigger it.
Check this first

[Sadistic Taste]

Re: ASUS X502C charging, but won't power on

Sorry, I meant I replaced the bios battery, not the chip. Though, I intend on buying a pre-programmed chip to replace, as I don't have a programmer.

I just checked the voltage, 3.3v at the power swtich, which drops to 0 when power is pressed.

[Sadistic Taste]

Re: ASUS X502C charging, but won't power on

Soldered a new bios chip, which was pre-programmed, but still the same problem.