[help]820-01521 WATER DAMAGED

[phantom]

HELP! audio board+its flex+powerbtn flex water damaged (an hole on audio board)!!! chnged both, but i have 5v on both ports:

mov: IMG_3478.mov

Visit this link to play the video: IMG_3478.mov

files.fm

here some measurements

ppbus_g3h 12,29v
PP3V3_G3H 3,29v
pp3v3_upc_xa_ldo pp3v3_upc_xb_ldo 3,27v
PP1v8_UPC_XB_LDOD PP1v8_UPC_XA_LDOA 1,8v
PP1v8_UPC_XA_LDOD PP1v8_UPC_XA_LDOa 1,8v
PP1V1_UPC_XA_LDO PP1V1_UPC_Xb_LDO 1,1v

with battery connected, as soon as i connect the cable, i see direclty 20v, but stuck at 0,0250

 

[2informaticos]

T2 possibly damaged by overvoltage through its data lines connected to audio board.
Check diode mode to ground at SPKRAMP_RESET_L and SPKRAMP_INT_L.

 

[phantom]

SPKRAMP_RESET_L is shorted

 

[2informaticos]

Many times machine still boots in such case.
Seems that T2 got more damage in your case...

 

[phantom]

so i don't understand: is it 100% game over? have you seen the video of the behaviour?

 

[2informaticos]

Several people reported working machines, only missing audio, after audio board/flex corrosion.
As your own doesn't even turn on, there must be more damage.
Even if you fix that, still no sound at the end; is it worth to continue?

BTW, did you test the MLB with audio flex disconnected?

 

[phantom]

Data is EXTREMELY IMPORTANT!

Mlb doesnt work without this board

 

[2informaticos]

If is for data recovery, you can invest some more time on it.

Check first if is at least detected in DFU mode.

 

[phantom]

Should I Connect it with or without battery to my MacBook Air?

Because i have 5v without battery, 20 with battery

 

[2informaticos]

Better to have battery connected; also the trackpad.

 

[phantom]

It is not in dfu mode, i've tried to force it to go to dfu mode, but watching the amp meter, is like nothing happens...

i've done a lot of try and sometimes it goes to 20v like in the video, but nothing happens.

there must be something to check!!

 

[2informaticos]

You may have problems with power button, caused by corrosion.
External switch method is the best option.
However not easy in this case, as you don't have pads for SOC_FORCE_DFU.
You should find proper points to solder some wires and connect the switch.
Also good to use another switch for PMU_ONOFF_L, disconnecting audio flex.

DFU Mode Restore (Macs) - LogiWiki

We have Apple MacBook and iPhone Diode readings and general fault finding information compiled by the leaders in this area

logi.wiki