CF18 wont boot, some LED's come on though

Hi guys, I've been searching through the site to see if I can find an answer to this but cant seem to make any progress.

The model is CF-18KHH08BE.

First of all, plugging the AC in starts to charge the battery and the battery light comes on.
When trying to turn it on, the three lock lights flash briefly (caps lock, num lock and scroll lock) and the power light and brightness led's come on but that is all, it does nothing from there. There is nothing on the screen and the hdd light never lights up. Pressing the wireless button makes the wireless led's come on and flash away like normal. Apart from that, nothing else does anything.

I've tried removing components to try and narrow down a suspect however I am now leaning towards the motherboard being at fault.
I have removed the hdd, the wireless card, replaced the cmos battery, there is no add in RAM to remove. I have also tried an external monitor on it but nothing shows up. I have no spare cf18 as I wanted to try the keyboard but I am still doubting that could be the fault now.

Do you guys have any ideas of what I can try or shall I convert this into a door stop? TIA

 

I have had several 18's do this. Completely disconnect the motherboard from the chassis, then plug it back it. I have had that work on 5 units so far, and told at least 3 others to do that and it went back to working.

 

Oh well that sounds very promising! Thank you Ador, but just to clarify, by 'disconnect' do you mean fully remove the mobo or is there something in particular I can disconnect?

By fully remove, I mean the process from beginning to 7:05 of this vid - Panasonic CF-19 touhgbook mother board removal - YouTube

 

I'll bet a power pull reset would work.....It would be worth a try.


1. Pull battery.
2. Dis-connect power supply.
3. Hold switch on for 20 seconds...repeat several times.
4. Plug in power supply. (not the battery yet)
5. [F2] [F9] [F10] (boot to bios, set to defaults, save)

 

I have always pulled the board and looked it over, when I put it back in it worked. You may get around going that far, by unhooking everything you can get too from the bottom side access panel.

 

I had one do that and it was toasted,pulling the motherboard on an 18 is pretty easy but start with the simple stuff first,hard reset then pull it.