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L4800 was blown! thanks.

I'm woking on an A 1708 MacBook Pro (820-00875) Which has a bad trackpad but a functioning keyboard. I replaced the trackpad with a known good trackpad and cable, reset SMC and PRAM, the trackpad is still not working . The cursor does work with a USB mouse plugged in. Checked the F4800...

Sorry, fixed the typo in the post. Those were the measured voltages from the 6 pin Q8400.

I checked Q8400 as it's the next thing upstream from D8400 which was the only component that appeared different. Q8400 pin1: 0V pin2: 0V pin3: 12.6V pin4: 12.6V pin5: 0V pin6: 0V Looking at C8410 i'm getting 0V from ppv_s0sw_lcdbklt, and c8401 is running at about 0.5V on both pins. Am I on...

That I did! With the LCD connected measurements are as follows: PP5V_SOSW_LCD --- 5V F8400 --- 12.7v, 0Ω PP3V3_S0SW_LCD --- 3.3V D8410 pin 1 --- 0.2V D8410 pin 2 --- ~0V EPD lines from J8500 all appear to be good, no shorts to ground.

Working on an A2159 (820-01598) that came in with physical damage to the LCD assembly near the hinge/screen bevel (see attached). The board itself appears pristine with no signs of corrosion or liquid damage. Tested with known good LCD assembly and the backlight is still out. Measurements so...

Board code 820-01598 After a bit more testing I found that I'm getting 12V to the PPVIN G3H rail with the USB-C plugged in. I don't have a USB-C Meter until the 21st, but I am getting a ~10mA AC draw from the charger (assuming 100-200mA DC to the board). I've also tested the two GAY chips...

Firstly I'd like to say that everyone at the Rossman Group does absolutely fantastic work. My hat's off to you. I'm working on an A2159 board which is not booting or showing any signs of life. Testing all the main power rails PPv20, PPv5, PP3v3, etc. I'm not getting more than 0.3V. anywhere...