820-0281 no boot

[Sr. Robot]

Hi, got an 820-0281 that initially had no backlight when turning on with the battery connected. (on charger only it had backlight).

J5250 was bad so i replaced it, not the machine is unresponsive. I get only 5v on PP20V_USBC_

 

[2informaticos]

What about 3V3_G3H and PPBUS_G3H voltages?
Inspect for any damage on MLB; connectors, traces, knocked off components.

 

[Sr. Robot]

PP3V3_G3H is 3.3v but it pulses down to 2.4, 1.2 and 0.3v
PPBUS_G3H is 0v

no signs of damage that i can see

 

[2informaticos]

Remove J5250 and check if board boots.

 

[Sr. Robot]

Removed J5250, no boot.

Same "PP3V3_G3H is 3.3v but it pulses down to 2.4, 1.2 and 0.3v
PPBUS_G3H is 0v"

 

[2informaticos]

Something was affected by the heat applied on the board.