Hello. As in description, TP and KB are not working when connected to the OEM display (working one). The angle sensor was damaged by a water, other than that I cannot find any more liquid damage or even stains. I took the bezel off the LCD to inspect but it looks intact. when I connect a spare LCD it works like a charm. I never seen before a laptop where KB and TP would work due to a display that is displaying without any issue. Any idea?
-
-
Review the smbus / I2C and all SPI interface lines. These interfaces will also be used by the trackpad and could be causing your issues. -
I did some measurements, and the only thing I found off is the I2C DISP BKLT SDA and I2C DISP BKLT SCL lines. They show 1.24V and some data flow during boot, then goes OV. I compared this with another working LCD, where the voltage remains steady — that's the only difference I found.
There's one SPI line I don't have access to; I'd need to solder a wire to the connector to measure it. So yes, the faulty screen sometimes displays content and sometimes doesn't. In both cases, the touchscreen and keyboard aren't working.Attached FilesComment
-
-
Suddenly TB and KB started working. No idea why..Comment
-
Hi guys.
I Just replaced battery on my MacBook Pro A1989. Unfortunately doing that, I’ve broken the trackpad flex cable (821-01701-a), and I’ve already ordered a spare one. At the same moment I’ve noticed that also the keyboard it’s not working anymore and I’ve found an SMD chip unsoldered and moving freely inside the backplate. I can read L20L on the chip. Is something could explain the keyboard not working or the keyboard doesn’t work due the unconnected trackpad?
thanks...04-17-2025, 09:42 AM -
Hi! This Mac has been an headscratcher for me, I can't seem to figure out the issue. The Macbook has gotten water damage to the front of the keyboard connector and battery connector. The keyboard connector was dead, by which I mean it was completely corroded and I have replaced it with a brand new one.
I have verified all the pins are connected to the main board and the main voltages (PP1V8_AONSW_KBD_ISNS and PP3V3_AON_KBD_CONN) are both present, with and without keyboard attached.
Unfortunately, the keyboard does NOT want to work, caps lock LED not functioning as well as any...06-16-2025, 12:03 PM -
Hello,
I have been following the posts in the forum for some time now and have learned a lot. I would first like to thank you for this and hope that it will continue for a long time.
I received the MacBook in DFU. The recovery always failed with error 1. After some search, I was able to find a defective inductor (LT202).
After replacing the component, I was able to successfully complete the DFU restore. Unfortunately, the trackpad and keyboard where still without function.
So i measured all voltages and diodereadings on the JT400 connector. ... -
Hi,
I do have problem with MacBook A2681 every time i close the lid, when re-open trackpad does not work, i need to close it again and the re-open and it's come back to normal, i've tried software reset, inspected the board, replaced screen angle sensor (from Apple), nothing changed, any ideas?04-06-2024, 04:16 AM -
Hi friends.
This model has a very weird fault.
Macbook Air M1 A2337 - 820-02016
it works for a while and after a few minutes the TRACKPAD AND KEYBOARD stops working
I already formatted, I already changed flex and trackpad. The error continues, I tried with another keyboard and the same error happens.
works for a while and then stops working trackpad and keyboard
(i rebooted and it works again, after a few minutes the failure returns)
THE BOARD LOOKS VERY CLEAN and IMPECCABLE
Thanks
Comment