Asus X54H K54LY Rev. 2.0 left click button always pressed

[antoniu200]

Hello and Happy New Year! So, I have had this X54H laptop for about a year now, bought it used at a very good price for the performance, but since it arrived it had one issue: the left trackpad button wasn't working. So, now that I had some free time, I decided to open it up and fix it. To my suprise, the buttons were soldered on to the Motherboard. So, I went to a local electronics shop and bought me a similar button to the broken one, the difference being in the fact that the new one is missing a 5th pin. I hoped it would work just fine, but when I went to solder it on the Motherboard, two copper pads from the PCB came off.

Now, I started looking for a schematic, which I actually found and used it to solder some wires to connect the button pins to the needed signal creators. The schematic will be in the attachments below (OpenBoardView can't view the fz file inside the rar, only BoardViewer can, linked below in attachments). I had to replace SW3101, but both the LEFT copper pads came off, so I soldered the LEFT pins from the button together and soldered a copper wire to the chip creating the signal from the bottom side of the board (forgot its name, I'm writing this from my phone and I can't view the schematic right now). The LEFT signal is indeed being triggered, only issue is that it's always triggered, regardless of the physical press. Why is this and how can I fix this?

[BlueMidnight]

Re: Asus X54H K54LY Rev. 2.0 left click button always pressed

Some possibilities:

- LEFT shorted to ground pin/pad, nearby trace, or switch body. Visually inspect area.
- New switch sits too high and is therefore always getting pressed. Listen/feel if it clicks reliably when you press the plastic button with notebook assembled.
- New button does not have the same pinout as the old one. With switch desoldered, check which pins have continuity with a multimeter. The 2 LEFT pins may have continuity. The 2 ground pins may have continuity. But, no LEFT pin should have continuity to any ground pin unless you are pressing the switch.

[antoniu200]

Re: Asus X54H K54LY Rev. 2.0 left click button always pressed

I have already inspected the first two possibilities you gave me, but to no avail. The copper wire was touching a ground pad, but I rerouted it and now there is nothing to touch. The button is not always pressed, I took care of that from the beggining. The only option (and very interesting I might add) is the last one, which I didn't know could be possible, and will give that one a try later today. Will post back when I test that button.

[antoniu200]

Re: Asus X54H K54LY Rev. 2.0 left click button always pressed

The pins were placed in a different way and now it should be working. But I can't test, as I have bumped into yet another issue: a pin fell off the flex cable for the power button and now the laptop won't power on. I'll go looking for one tomorrow, but before that is happening, if any of you know where I'll be most likely to find one, please advise: the cable is a 60V-VW1.

[antoniu200]

Re: Asus X54H K54LY Rev. 2.0 left click button always pressed

Well, I did find some cables, but they were a bit bigger in width than I needed so I had to cut them. But, while doing so, I either ended up cutting them wrong, either their pins fell right off in my hand. So, I'm selling the laptop on parts, it's my best shot right now. I'll get some money and buy me a serious laptop, not pieces of junk. However, it was nice working on it and nice seeing the possibilities an electronic component change can give you.