TP 600e totally dead.....Fuse location?

[Westford]

I have a 600e. Apart from the battery being shot, it was working fine. Since the battery died, it's always been run from AC.
Recently, and without warning, the laptop just refused to power on, and it remains in this state. Basically there is no lights(not even the orange LED which usually lights when the AC power is turned on), no sound, and nothing happens when the power switch is activated.
What have I done:
I've tried running it from other batteries, with no AC....no change (Although I do not have a known good battery to try).
I've used different AC supplies....No change.
I've removed all easily removable components (DVD, PCMCIA cards, MEM)...No change.
After that, I set about dismantling it... I checked for power in & around the battery connector location, and on the power switch, while the AC adapter is attached, and found power there....which I guess illiminates the DC power jack.
The only thing I did not do was to remove the actual mother board from the chassis back plate...But I've inspected the board as much as I could....No sign of damage, or obvious damage to components, and no tell-tale smell, suggesting that anything went pop in a major way.
Can anyone tell me if there is an onboard fuse....& it's location?
Or failling that, any general suggestions would be appreciated.
Is it time to admit defeat?

[beecee]

There are no Fuses on the 600 Series Motherboard. I think you can reasonably assume that it needs a new one. These are quite cheap these days off eBay but make sure you get the correct one, & preferably, Buy 1 with the Cpu attached.

[jamiphar]

Welcome to the forums, Westford!

Actually, there are quite a few fuses on the 600/E/X motherboards. I can't take my 600X apart right now, but I believe they have F1, F2, F3, etc. designations next to them. I would check for blown fuses (or any other damage) on the motherboard near the power jack. A good way to check the fuses is to use the ohm (Ω) selection on a multimeter and check for continuity on the fuses contacts. If you don't have continuity, then the fuse is blown.