Macbook Pro 16 2019 A2141

[ndarjo21]

DEVICE : LAPTOP
BRAND : APPLE
MODEL : A2141
PROBLEM : Not show picture, the click in touchpad can clicked. so it seems the device power on i guess.
it can charge, 20v 3.8 amps when battery connected

MEASUREMENT :
20KOHM L7600 P5VG3S
27KOHM L7660 PP3V3
54.9OHM L8102 PP0V95
33OHM LA950 PPVDD075_GPU
0.00OHM LA870 PVDDIOMEMGPU
0.00OHM LA860 PVDDIOMEMGPU
0.00OHM LA850 PPVDDCIMEMGPU 0.00OHM LA750 PPSOC_S0_GPU
0.00 OHM LA710 LA740 LA720 LA730 PPGFX
121 OHM L7701 P1V2
19.8OHM LA7330 CPUVR_SWSA
2.5OHM L7231 PPVCC_CPU
2.5OHM L7221 PPVCC_CPU
2.5OHM L7211 PPVCC_CPU
6OHM L7420 PPVCCGT_CPU
6OHM L7410 PPVCCGT_CPU
14KOHM L8410 PPVIN
18KOHM L7030 CHGR

seems, the GPU + VRAM dead? isnt it?
can i make it into UMA
i read schematic, there are strap for VGA Ctrl Enabled

[mon2]

Can you toggle the caps key LED? If yes, then the OS has booted and you are at the login screen.

Have you attempted to mate with another macbook using the 'T' key upon power up? This should allow you to target this laptop for remote data recovery.

https://www.it-tech.com.au/recover-d...20disk%20drive.

[ndarjo21]

thanks mon for answering, but isnt it clear that 0 ohm in PVDDIOMEMGPU, PPSOC_S0_GPU and PPGFX tell us that the discrete GPU is dead?
sadly i dont have another macbook in my place, so i couldnt test that + i dont need the data btw. i will check if capslock LED respond or not. but i guess it wouldnt because the short make the PGOOD signal not come up. just guessing

[mon2]

Yes, GPU may be dead. GPU rails will have a very low resistance to ground, by design but if 0R, most likely dead. Touch your meter probes together. What is the resistance? Is this the same resistance you are measuring on the GPU power rail(s)?

20v 3.8 amps

Do you see this current spike to 3.8A immediately or climbs up to this value?

[ndarjo21]

my touched probes is 00.00ohm in resistance mode, and 0.000v in diode mode. it is uni t ut60s. yeah, it same as measuring GPU and VRAM rail.
the current climbing slowly to 3.8amps if battery connected. if not connected, it will go from 5v, then 20v 0.0 amps up to 0.4amps, then goes down to 0.07amps, then 0.00amps 20v

[ugamazing]

Make sure you check for SSD damage/death--super common on these and will give you 20v/low amps with trackpad click. Make sure the trackpad clicks fully for 30 seconds and make sure board isn't actually cycling on ~21 second intervals (a very common indication of SSD issues). If SSDs are toast, you may not be getting the data from them, so check carefully.

[ndarjo21]

hi ugamazing, thanks for answering. but i dont need the data. i just need to make sure this macbook can turn on and usable even without discrete GPU. thanks for the suggestion

[ndarjo21]

case closed, no fix