820-02037 restored dfu but no display

[Donlan78]

have 2019 16" maxed out specs would really like to get fixed, original issue was no power 5v all ports, if battery is disconnected i get 20v on all ports, soon as battery connected drops back down to 5v 0amp on all ports, thought i had restored power issue, something I'm missing,
with battery disconnected track pad clicks, display stays off, i am able to restore MacBook with apple config 2 with battery connected, but didn't help

 

[2informaticos]

Are you using original 96/140W charger?

Which big coils get voltage?

 

[Donlan78]

using oem 96w charger,
without battery
L8410 0.045
L7030 12.59 voltage bouncing drops to 7.5V
L7701 0
L8102 0
L7600 5.13
L7660 3.49
LA950 0
LA860 0
LA850 0
LA750 0
L7221 0
L7211 0
L7420 0
L7410 0
L7231 0
L7330 0

 

[2informaticos]

Forget L7030; its voltage is not relevant like in old models.

Some new machines don't boot without battery connected.
Not sure if is your case, but you must test.

Check diode mode to ground on the coils which remains at 0V.
Compare with good board, if available.

 

[Donlan78]

if battery is connected, i get 5v 0amp
closest board i have to this is 820-01700 quite a few differences
without battery diode reading
L8410 .835
L7030 .488
L7701 .106
L8102 .091
L7600 .399
L7660 .367
LA950 .003
LA860 .020
LA850 .060
LA750 .060
L7221 .002
L7211 .002
L7420 .006
L7410 .006
L7231 .002
L7330 .027

 

[2informaticos]

"LA950 .003"
Looks to have a problem there; means you have less than 5 ohm.
I got 25 ohm aprox on good board.
Probably damaged GPU...

 

[Donlan78]

sorry thought you said to take diode mode reading,
with meter on ohms black ground, red as probe

L8410 215k-300k reading is inconsistent
L7030 285k
L7701 73k
L8102 43k
L7600 250k-500k reading inconsistent
L7660 0.560m
LA950 2.5ohm ? did you mean 25ohm or 2.5ohm
LA860 15.4ohm
LA850 42.2ohm
LA750 42.2ohm
L7221 2.2ohm
L7211 2.2ohm
L7420 6.1ohm
L7410 6.1ohm
L7231 2.2ohm
L7330 18.3ohm

 

[2informaticos]

Yes, diode mode is basic test.
Switch to ohm scale only for very low readings, usually under 0.010 in diode mode.

0.003 in diode mode signifies less than 5 in ohm scale.
Too low comparing with 25 (not 2.5) I got in my test board.