820-00687-a A1534 2017

[lincev]

hi to all, I have this motherboard with a problem that it does not turn on. I have tested the charging and battery connector and with another board it works perfectly. In the power pad I don't have 3.3v.

the history is it worked fine but from one day to the next it did not turn on again (this was a week ago)

Any help to know what measures to take and diagnose? I would like to know if it has a short or the CPU is dead.

thx u

edit: Sorry I was testing a new connector, in case it helps, the original usb-c connector doesn't work in case this damage could have caused a short on the board

 

[2informaticos]

Check diode mode to ground on J9600 pins.
Compare readings with good board.

If USB-C connector was bad, you may have damaged U3100, or even CPU.

 

[lincev]

hi again:

Point 21, 19, 17, I have value 700, 690, 701 at bad board, but with good board I have 1400, 1396, 1405

 

[2informaticos]

Did you check both boards with red probe connected to ground?
Also check without USB-C flex connected.
There are some components placed on the flex.

 

[lincev]

Did you check both boards with red probe connected to ground? no sorry with black.

with red:

bad board | good board
Point 21: 590 590
Point 19: 560 486
Point 17: 470 599
Point 15: 480 353
Point 13: 360. 354
Point 11: 500. 606
Point 9: 470 597
Point 7: 470 470
Point 5: 470 470



omg sorry I'm confuse, but I check this to J9600 connector of board without usb-c flex.

 

[2informaticos]

15, 17 and 19 go to U3100.
You can change it, just to see if these values go better.

Pins 9 1 & 11 go directly to PCH/CPU; bad news.
The board may be trash now...

 

[lincev]

I have two boards to get this IC U3100 both with SSD problem, I have doubts which is better...