820-01958-A: completely dead: no voltage no amp

[phantom]

hi, please help! i have

820-01958​

dead: no liquid spill or damage.

amp meter stay completely off in both ports...

i have 4ohm resistence on
PP20V_USBC_X_VBUS and PP20V_USBC_T_VBUS

If i go on those line with power supply with 1v 1amp, it goes directly to 0,27v 1amp in both lines but i can't see anything hot

 

[phantom]

even removing both cd3217, o have the same resistence and 0,001mv in diode mode

 

[2informaticos]

"1v 1amp"
???

If you have pure short, the board tries to sink way more current.
PSU will NOT inject anything, if you set 1A limit.
I ALWAYS said on the forum: set amp limit to MAX on PSU first.

D3300/20 are the first suspects; or D3302/22, if soldered.
If the CD3217 chips are bad, you should find bad diode mode readings on several lines.

 

[phantom]

I mean that I have set power supply with 1v and amp limit to 1amp

And as soon as i touch the line, motherboard sink 1amp

I’ve removed both cd3217 but short persist in both lines

 

[phantom]

removing d3302 and d3322 i've not short anymore....

now how can i substitute those components?

 

[2informaticos]

Try to get them from scrap boards.
Machine will work without them; of course, no overvoltage protection anymore.
This kind of failure is caused by bad/fake charger.

"motherboard sink 1amp"
And dropped to 0.25V, becuase entered in protection mode...