I got this dv9723cl as a trade-in for another machine. The customer said that it kept powering off randomly. Ok, no problem, probably just needs some cleaning and some new thermal paste, right? Nope.
First I did just that. Cleaned out all the vents, took apart the fan assembly and cleaned very well in there. Removed the old thermal paste and applied new. All the standard stuff. Put it back together (big mistake), powered it on, it booted into Windows, ran for about 5 or 10 minutes (this was from a cold start) then just shut itself off. No warning or anything, but it did seems like it got shut down just as it was starting to beep. There was like a fraction of a second of a high pitched sound before nothing. The fan never even sped up or anything. It just kep right on spinning at a normal speed until it powered off.
Ok, well maybe there's an issue with the power jack. Tested the voltage and it looked good but decided to replace it anyway because the jack did seem slightly loose. Same problem.
Replaced the power supply with a brand new original HP power supply for that exact machine. Same problem.
Replaced the CPU, heatsink, and then a brand new fan. Same problem.
Replaced the RAM. Same problem.
Then I replaced the motherboard ... twice! Same problem.
Replaced the battery, even though this happens with or without the battery installed. Same problem.
Yes, I've spent about 3 or 4 times what the thing is worth just trying to get it to run consistently. I could have built a new one or two if I would have just bought the plastics!
The only parts that have not been swapped out are the hard drive, the lcd assembly (including cable), the power button switch, and the plastics. That's not to say that somewhere along the line I didn't replace a bad piece with another bad piece accidentally because that's really about the only explanation I can come up with now for why this thing refuses to work.
This is no longer about just trying to refurbish and resell the machine. This is personal now! I can't let this one laptop beat me! Can anyone offer any kind of advice? Anything to look for? Any suggestions (except "give up") are gratefully accepted.