82-3209 no charger light

[mobajer]

Hello, i have 820-3209, I/O board was burned, now there is no sighns of life. No orange/green light on charger. 16.5v comes to Logic board. 9ahrtz is changed, but still same. what voltages should i measure?

 

[aprendiz]

pp3v42 present????

 

[mobajer]

yes, it present

 

[dukefawks]

Used new IO board and new cable? Must have green light first. PPBUS voltage?

 

[mobajer]

Hello, i have found nominal lost on resistor: R7005 changed it.. Now light comes on. Mac works from charger and from battery. But if attach charger when battery is plugged q7080 and q 7085 burns.

have changed both q7080 and q7085 also u7000, but its same.Q burns and light dont come on.

 

[mobajer]

any advice?

 

[smiba]

Are you sure they are soldered on correctly, especially their thermal pads? Any chance you damaged them?
Maybe someone else has any idea because I don't understand how these will "burn" (even when under full load they shouldn't be), these do not have a simple path to ground and also the charger would immediately cut out if it were to happen.

Resistance to ground (in Ohms) on PPDCIN_G3H_INRUSH? Using an original adapter or chinese copy?

If you're sure everything is soldered on correctly you might want to try and replace Q7080/85 and U7000 all at the same time.

 

[dukefawks]

Replace U7000, Q7080/85 all at the same time. Check Resistance between pins 17/18, 27/28 of U7000.