Powerbook G4 keeps sleeping.

Help! I am having the same sleep issue as many have posted. It started without warning yesterday. Powerbook goes to sleep whether plugged in or not. Can happen 5 minutes after start-up, then repeatedly thereafter.
Checked the console application, searched for overtemp and here is a sample of what I saw:
Aug 30 14:50:19 Surek-Power-Book kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
Aug 30 14:50:21 Surek-Power-Book kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
Aug 30 14:50:49 Surek-Power-Book kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
Obviously I cannot get my work done with it falling asleep every few seconds. What do I do now? It is out of warranty obviously. Is there any other possible cause than a bad trackpad sensor?
I have reset the PRAM, reset the PNU, run disk utility. Any other suggestions?
Thank you!

I had this same problem and fixed it myself. But i'm a tech so i do this for a living but i'll describe the fix for those who want to attempt it.
My powerbook started randomly going back to sleep about 2 months ago, it would do it at all times, eventually it would even do it when i hit the enter key. I found if I applied pressure to the power button , and top right area of the machine i could cause it to jump to sleep. Many years ago the backlight had stopped working and I figured it must have burned out, that was actually related and this fix brought that function back to my laptop after it disappeared 3 years ago.
I removed the casing on the laptop and you will find directly under the power button a addon board that hold the optical sensor on that side of the machine. This is mounted on a small electronic board which makes contact with the mainboard underneath. There is no snap or screws that actually hold these contacts together and this is the source of your problem ( probably ). Because this board is held against the main board mostly with the pressure of the keyboard casing if it has any wiggle it gets disconnected as you type and shorts out, causing your system to sleep. I cleaned the contacts lightly on this board and the mainboard and added a small piece of fire safe foam on top of it. The idea being that with this extra shim the casing of the laptop will push down that much harder on this piece, removing the wiggle removing the sleeps.
After doing this and returning my laptop to it's assembled state the problem entirely disappeared. And as an added bonus my backlight came back.
Keith

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