MBP A1278 - Won't power on, no green or orange light on charger

[techgeeksna]

MBP A1278 - Won't power on, no light on charger. No liquid exposure visible, where do i start? Ive already pulled the board-view for it if that helps. Thanks in advance

 

[aprendiz]

wich board is this??? First start with PPBUS_G3H and PP3V42_G3H, voltage in both...

 

[techgeeksna]

wich board is this??? First start with PPBUS_G3H and PP3V42_G3H, voltage in both...

[h=1]820-2936 Board, and PP2V42_G3H 0V , PPBUS-G3H 0.04V[/h]

 

[dukefawks]

3V42 is the first thing you need. Voltages on D6990? Check for short to GND on 3V42.

 

[techgeeksna]

3V42 is the first thing you need. Voltages on D6990? Check for short to GND on 3V42.

Hi dukefawks, D6990 Voltage - 16.55V PP3V42 Short to Ground.

 

[dukefawks]

Inject voltage on 3V42 rail and see what heats up.