Strange touchpad issue

[wavey]

I've got a HP 15-da1999na on the bench, came in for SSD and Install Win 10 (I know).
Old HDD had lots of bad sectors, running very slowly and touchpad not working.
So new SSD and Windows and all working perfectly until I put the bottom plastic back on, no touchpad. take the base back off and the touchpad works. must have tried 10 times always the same, base off it works, base on doesn't work.
Explain please

 

[wavey]

I've got a HP 15-da1999na on the bench, came in for SSD and Install Win 10 (I know).
Old HDD had lots of bad sectors, running very slowly and touchpad not working.
So new SSD and Windows and all working perfectly until I put the bottom plastic back on, no touchpad. take the base back off and the touchpad works. must have tried 10 times always the same, base off it works, base on doesn't work.
Explain please

I must say that it's not in the best condition, looks like it's been lassoed by a cowboy and dragged around the farm for an hour.

 

[NviGate Systems]

Any plastic areas that might be pinching or pressing on track pad area? Trackpad cable securely inserted and locked?

I would say since it's repeatable there is something physical happening when you put the base on. Inspect where the tracked is. Any magnets loose meant for something else? It must be something.

 

[wavey]

Tried all that, even washed it. There are 4 plastic mouldings that press on the cable locks to stop them coming loose, cut those off and still the same. Never seen anything like it.

 

[wavey]

Obviously the inside of the base is conductive so I've checked that nothing is shorting out. Weird.

 

[wavey]

I'm not really expecting an answer here Guys, just venting.

 

[Larry Sabo]

Swollen battery pressing against the touchpad, or battery not properly installed (i.e., clips under tabs)?

 

[wavey]

Since I last posted it has worked twice but failed again, got to just be a bad touchpad. Battery is nice and flat, all LOOKS good. I'll be out of the country for a few weeks now, so if he wants to bring it back when I return I'll order a new touchpad.

 

[britechguy]

If you're returning this to the client, make sure he knows to check the checkbox in touchpad settings to disable the touchpad if an external pointing device is connected.

He's going to need to use a mouse anyway for the time being, and it's better to ensure there cannot be any "weird interaction" between a wonky touchpad and what the mouse is trying to do.

 

[wavey]

If you're returning this to the client, make sure he knows to check the checkbox in touchpad settings to disable the touchpad if an external pointing device is connected.

He's going to need to use a mouse anyway for the time being, and it's better to ensure there cannot be any "weird interaction" between a wonky touchpad and what the mouse is trying to do.

Yes, done that. He collected this morning and is happy to come back once my holiday is over.

 

[phaZed]

It could be a bad ground/ground loop issue between the touchpad and the casing. I've been able to fix some of these by providing a real, soldered ground wire to the board. Sometimes it's simply the touchpad IC or circuitry that has failed and ties up the USB/I2C Bus, causing the poor performance. I'm going to bet on the grounding issue as it seems to change based on the bottom plastics being installed or not.