After updating the system to Sonoma, the keyboard backlight does not turn on! Preinstallation through recovery did not change the situation. Resetting smc and pram did not help! restore via dfu is also zero! I put the board in another Mac and it turns on the light! I put a board from another Mac into this one and the backlight works too! Only the original board does not turn on the backlight! Can anyone please advise, I beg you!
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Answer selected by PITERPENY at 03-23-2024, 04:50 PM.
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Can anyone help with a schematic and board layout for the keyboard 820-01294-A in Macbook Air A1932 please? (for reference, mainboard is 820-01521-A)
Alternatively, I'd settle for confirming value of a resistor on the keyboard (red arrow in picture below)
Water damage keyboard, with corrosion visible on the noted resistor (picture was taken after cleaning). One pad under the resistor was corroded and resistor fell off while clearing the potting resin (or whatever it is Apple has coated the components in).
By chance I discovered that mainboard 820-02443 has...03-22-2024, 11:57 PM -
my system is p5ql pro asus mobo , logitech keyboard ps2 keyboard (more than 10 years) .
my place use to get some power drip for a second ,at that time , pc shuts and restarts itself , it dint cause any problem till now , once or twice i noticed , i am not sure if it was exactly at power drip time or normal time - both keyboard and ethernet lan stopped working , the keyboard would lose power i mean led lights-num lock caps lock would not stay on , no light at etherbet cable too..then i would restart the pc - then its all good .
few years back ps2 mouse stopped working, but ps2... -
Hello all,
Am trying to figure out this backlight issue with this A1990 Macbook Pro.
Tests performed:
There is no backlight even with a good screen.
Backlight IC is receiving the correct support voltages.
Fuse F8400 ok
Current sense resistor R8400 ok
Backlight IC is receiving 3.3V on enable pin.
Backlight IC receiving voltage from PPBUS_G3H, aprox 12.5V.
Backlight IC receiving 5V from PP5V_G3S
Backlight IC BKLT_SCL and BKLT_SDA both measure 0.545V diode mode to ground
I2C_BKLT_SCL and I2C_BKLT_SDA both measure... -
Hello,
YouTube video of the problem encountered: https://youtube.com/shorts/q7TLNv36LUo
I am a pro and I have a problem that I have never seen despite my 7.5 years of experience on my own and my thousands of repairs, on a customer's Dell G3 15 3500.
On this PC I have already changed the complete palmrest because the keyboard was no longer working properly.
I also changed the screen because the PC fell and the screen was broken.
I changed the battery with a new and original battery.
I also had corrosion/oxidation on the... -
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
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