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4924 - Huge liquid spill, no power.

gcain

gcain

New member
It was soaked. Board is in okay shape considering

Green/Orange light okay. Originally I was only getting 1.6v on PBus. Sent it through the UC and now PPBus is right, still no power.


Voltages in no particular order:
PP_VRTC_G3H = 3.4v
PP3v3_s5 = 3.3v
PP5v_s5 = 5.02v
PP3v3_s4 = 0v
PP5v_s4 = 0v

R8115 = 0v either side.

PPBus = 12.58v
PP3v42 = 3.42v

L7560 = 3.4v
L7520 = 0v
 
A

aprendiz

Moderator
Check if you get any pulse on L7520 after connect charger, may need osciloscope.........

Check corrosion around U6100, J6100, SMC...

Resistance to ground on L7520??
 
gcain

gcain

New member
aprendiz said:
Check if you get any pulse on L7520 after connect charger, may need osciloscope.........

Check corrosion around U6100, J6100, SMC...

Resistance to ground on L7520??
Click to expand...

I don't have access to a scope unfortunately.
U6100 and the J6100 look great and beep out ok.
SMC looks spotless, even probe points aren't discoloured.

The only hint I could see is it looked like there was grime around the Camera chip (U3900) so I sent some flux under it.

Resistance to ground on L7520 never stops counting. It reached 5MOhm at one stage.
 
gcain

gcain

New member
I can actually pick up a pulse on L7520 when I first connect power.


P5V3V3_VREF2 == 1.99v, is that right?
 
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dukefawks

Administrator
The board was soaked.....so where was the corrosion? The usual suspects apply, U6100 and traces/resistors, J6100, U1900/50 and possible crap under the SMC. Also check CPU Vcore resistance to GND.
 
gcain

gcain

New member
I got the board in under and hour and it went straight into the UC or I couldn't work on it.

Only corrosion I can spot is around C7622, C7317 and C7202. They're all HS_COMPUTING pretty much and all measure 12.58v

U6100 looks good and does the jack.

PPVCC_S0_CPU (Is that VCore on this board?) is 0.3 and 0.4 Ohms to ground

I'll flow some flux under the SMC in the mean time and see what happens.
 
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