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820-01521 no power and sound

K

Kyle93

Active member
Arrived heavily liquid damaged from being left out in the rain. Board itself did not suffer too muvh liquid damage. Had to replace IO board and battery.

After replacing Q3200 and D3320 board was powering into the OS but there was no sound.

While measuring around for the no sound issue the board suddenly got stuck at 5v. Now, If board is plugged in with battery theres a steady 20V at 0 amp current draw. If board is plugged in by itself its stuck at 5v 0.7 amp

Already tried DFU restore but no response.

PP3V3 is good 3.3 and PPBUS_G3H is 12.30V

What should be checked next??
 
2informaticos

2informaticos

Administrator
Staff member
Very likely T2 damaged by liquid spill on audio board.
Poor design from Apple, signal lines of T2 close to PPBUS_G3H on the connector.

I found one board where SPKRAMP_RESET_L was shorted to ground, 004 in diode mode (inside T2).
No speakers sound, but good headphones sound.
 
K

Kyle93

Active member
Just checked my board and wow my SPKRAMP_RESET_L is shorted to ground 0.01 in diode mode.

Does this sound like T2 is damaged and cant be fixed at this point to at least get it to turn on again without the sound??
 
K

Kyle93

Active member
Does it make a difference if battery is plugged in?

with battery get 20v at 0 amp draw

without battery 5v at 0.07 amp
 
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