This unit showed no sign of life and was a weird design for power in button.
I have to admit this was a 'lucky' repair. While diagnosing where was the DC power, I discovered that a power MOSFET was open, No Power anywhere, no lights, no charge and stone cold dead.
On the bottom of the board it was a mosfet FDS6676 that was open. When I replaced it with a substitute I was able to follow the DC circuit, but it dropped off at the power button. So testing that area I noticed that when I put the meter positive on point on the board the light behind the pwr button would flash briefly.
Recalling a similar experience where I had to modify another CPQ 6735 when they first came out/released. I thought I would try my luck again.
1: With the meter set to VOLTAGE and holding the meter's positive lead on this point, the unit would come on. My first guess was 47k Ohm. This worked but the laptop would not turn off, or would come on when it wanted to.
2: I would need another meter to see the resistance the meter itself presented. This turned out to be near 100k Ohm. Getting another 100k Ohm chip resistor from a dead unit, then making the leads, and adding clear heatshrink to insulate it from shorting.
3: Always test thoroughly when out of case. This way you won't have to redo, or find out something else don't work.
First picture show resistor with background for clarity. The leads were added because there was no 'safe place' to tack to board. The white connector in picture is for the power button ribbon connector.
Click pictures for larger view
This shows placement where the part will lay. Heat shrink will be slid over resistor and hot glued down.
Hot glue holds part and wires to board. Makes it easy to remove additional work is needed later. This area is covered with a L-shaped piece of black plastic insulation sheet
Final and ready to test again and then close.
I always wondered why my high school Math/Algebra/Calculus teachers said 'Show Your Work'. I was one of those students that seen solutions in my head, and couldn't always say, tell why or how I got I got the answers. They were just visible in the front of my mind. Besides how can you explain something when you don't know the terms/rules and conditions of an equation, before you are taught 'the normal way'?
I quit that calculus class because I couldn't show the work, I didn't flunk I just quit it and picked another advanced science. Their loss not mine.