820-3332-A No light on Magsafe

[MaxFix]

Hi,

Pin on magsafe board look burnt because of shitty Chinese charger.
PP3V42_G3H - 3.45v
pin 19 U7000 - 5V
pin 2 - 16.5V
pin 3 - 3.8V
R7005 - 20 Ohms

Please advise how to proceed.

Sometimes I get Green or Orange light on Magsafe that will die out within 5 seconds.

Thanks!

 

[JohnB8812]

Tried new DC in board? Exact voltage on PPBUS_G3H? If charger damage check resistance between pins 17/18 and 27/28 of the ISL6259

 

[2informaticos]

Did you try known good DCIN board?
There is some protection circuit; serie coil/resistor and TVS diode.

PPBUS_G3H and 3V42 stable and correct?
Check U6900/01 voltages and conitinuity to Magsafe central pin.

 

[MaxFix]

New DCIN board was not good. Thanks guys. I feel silly

 

[2informaticos]

Damaged protection circuit; it still can be recovered...