2015 macbook air A1466 trackpad short

[res2223]

Hi guys.
Details about device:
RAM: 8gb 1600 MHz DDR3
Processor:1.6 GHz Dual-Core Intel Core i5

The machine was water damaged. Corrosion was cleaned and it boots up fine.
The keyboard and the trackpad don't work. When booting up, the chip shown in the image below is shorted (?) and gets very hot to the touch.

The keyboard gets power, as the caps lock light flickers. It does not turn off/on when pressed though.
The trackpad was replaced but the exact same thing happens.
The trackpad was tested with the keyboard disconnected but it still happens.
Curious to see what peoples opinions are on what the issue might be?

[mon2]

Re: 2015 macbook air A1466 trackpad short

To the best of my knowledge, the track pad documents are not public.

Based on the hot component, the controller is likely shot.

Best solution is to replace with a known good track pad and keyboard + fresh mating flex cable. We have seen too many liquid damaged units where corrosion can kill even the cable contacts. You could perhaps take from a donor unit or buy new. In the USA or Canada, try mobilesentrix. Otherwise, AliExpress or eBay.

[res2223]

Re: 2015 macbook air A1466 trackpad short

To the best of my knowledge, the track pad documents are not public.

Based on the hot component, the controller is likely shot.

Best solution is to replace with a known good track pad and keyboard + fresh mating flex cable. We have seen too many liquid damaged units where corrosion can kill even the cable contacts. You could perhaps take from a donor unit or buy new. In the USA or Canada, try mobilesentrix. Otherwise, AliExpress or eBay.

Hey mate. Sorry if I didn't make it clear but I have already replaced the trackpad + cable and it has the same issue. What are the chances I bought a faulty new touchpad?
The short still occurs without the keyboard disconnected so I'm hesitant to replace it.

[mon2]

Re: 2015 macbook air A1466 trackpad short

Ok. I will bet anything that the issue is with the mating cable to the logic board. It is most likely causing a short.

Carefully review the cable part # for the track pad you are using and then check the # of contacts that should be on the cable.

If the contact spacing is off, then you will have such issues.

Apple uses different number of contacts and contact spacing on these trackpad cables. Yet the width of the cable remains the same. It is easy to get confused here.

Post a clear picture of the contacts of the cable you are using. Then check how many contacts are supposed to be present for the logic board connector in the schematics.

[res2223]

Re: 2015 macbook air A1466 trackpad short

Ok. I will bet anything that the issue is with the mating cable to the logic board. It is most likely causing a short.

Carefully review the cable part # for the track pad you are using and then check the # of contacts that should be on the cable.

If the contact spacing is off, then you will have such issues.

Apple uses different number of contacts and contact spacing on these trackpad cables. Yet the width of the cable remains the same. It is easy to get confused here.

Post a clear picture of the contacts of the cable you are using. Then check how many contacts are supposed to be present for the logic board connector in the schematics.

Thanks. I have replaced the cable and the issue remains. I made sure the cable was the exact same so it's not the cables fault. I counted the number of contacts too. Any other suggestions?

[mon2]

Re: 2015 macbook air A1466 trackpad short

Post the full details of:

1) your logic board. The part number should be of the format 820-xxxx.

2) trackpad cable part #

3) trackpad part #

Is the trackpad cable being mated with the logic board in the proper pin 1 to pin 1 orientation? The trackpad is confirmed to be 100% good?