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820-00165 no power after water damage

C

crea2k3

Member
I have a macbook in that has water damage, when the power cable is plugged in it goes green and then orange, no fan spin is seen.

Damage was sustained on R7523 (P5V_S4RS3_VFB1_R) which had gone high resistance and had corrosion attaching it to the nearby ground plane. This was replaced with another resister and corroded pad re tinned.

There was also corrosion between C1272 (PP1V05_S0_PCH_VCCACLKPLL) and C1297 (PP1V05_S0SW_PCH_VCCUSB3PLL).

There was also a small amount of surface corrosion, but no component damage around R5360

The following voltage readings were made :
PPBUS_G3H
8.6v
R5430
ok

PPBUS_S5_HS_COMPUTING_ISNS
8.6v
R5430
ok

PP3V3_S5
3.3v
R2094
ok

PPBUS_S5_HS_COMPUTING_ISNS
8.6v
C7434
ok

PPDCIN_G3H_ISOL
18.5v
R7005
not - 15.04v

PP3V3_S4
3.3v
J3501
not ok - 0.340v

PPDCIN_G3H
18.5v
R7012
not ok - 15.04v

PP3V3_SUS
3.3v
R8133
ok

PP3V42_G3H
3.42v
L7095
ok

PP3V3_S3
3.3v
Q4800
not ok - 0.063v

PP3V3_S0
3.3
C5450
not ok - 0.058v

PPVRTC_G3H
3v
C1910
ok

PP3V3_S0
3.3v
C5450
not ok - 0.58v

PP5V_S5
5v
C7400
ok - 4.97v

PP5V_S4RS3
5v
C7600
not ok - 0v

PP5V_S0
5v
R8063
not ok - 0v

PP3V3_S4SW_SNS
3.3v
C5460
no ok - 0.038v
 
2informaticos

2informaticos

Administrator
Staff member
You've posted lot of information, but many confussions.
Also noted wrong assumption; suposing 18.5V means the voltage expected by you from charger.
Charger voltage depends by its type; is marked on it.

Please, stop to post SUPPOSED voltages; we need accurate information.
Seems that you get 3v3_S5/SUS but no other voltages; confirm if correct.
Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L.
 
C

crea2k3

Member
Th
2informaticos said:
You've posted lot of information, but many confussions.
Also noted wrong assumption; suposing 18.5V means the voltage expected by you from charger.
Charger voltage depends by its type; is marked on it.

Please, stop to post SUPPOSED voltages; we need accurate information.
Seems that you get 3v3_S5/SUS but no other voltages; confirm if correct.
Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L.
Click to expand...
The voltages where I put 'ok' match the voltages listed for that power rail in the schematic. Where I have written 'not ok' I have listed the voltage that was taken as it doesn't match the voltage on the schematic.

I have shorted R5115 with tweezers and saw the voltage temporally drop at PM_PWRBTN_L . I did see fan spin for a moment too, which then stopped. If I repeat this process again I don't appear to be getting fan spin again. The voltage still drops and returns to normal though as before.
 
2informaticos

2informaticos

Administrator
Staff member
Check for pulse at both PM_SLP_S4/3_L at same time.

As you get fan spin, means 5V_S0 comes on (on that moment).
Check for pulse at all big coils; also at ALL_SYS_PWRGD.

BTW, write directly on the Reply box, instead of clicking Reply button.
No need to quote an entire post, visible few centimeters above...
 
C

crea2k3

Member
Ok so both PM_SLP_S4/3_L pulse when triggered.
L7320 - CPUVR_PHASE2 - triggered
L7310 - CPUVR_PHASE1 - triggered
L7630 - P1V05S0_LL - triggered
L7430 - P1V05S0_LL - triggered
L7560 - P3V3_S5_REG_L - has voltage (no change)
L7130 - CHGR_PHASE - has voltage (no change)
L3095 - PPVIN_S4SW_TBTBST_FET - did not trigger
L7701 - PPVIN_S0SW_LCDBKLT - did not trigger
ALL_SYS_PWRGD - triggered
ALL_SYS_PWRGD_R - did not trigger
 
2informaticos

2informaticos

Administrator
Staff member
Do you mean pulse detected by "triggered"?
If yes, check now for pulse at pins 7 & 3 of U1950.

Try to start in SMC bypass mode also.
 
C

crea2k3

Member
pulse detected at pins 7 & 3 of U1950. If I start in SMC bypass mode, when I press the power button the fan spin for 1 second then stop. Then if I press the power button again they spin and then stop.
 
2informaticos

2informaticos

Administrator
Staff member
Do you know how to start in SMC bypass for sure?
Looks like tried incorrect way.
Board should start (or try at least), when release power button, not pressing.
 
C

crea2k3

Member
Yes hold the power button and plug in the charger. Nothing happens when I do this. If I then let go of the power button after this and start pressing it, the fan then spins for one second each time I press it.
 
C

crea2k3

Member
Iv just tried a second time, I put my finger on the power button and then plugged in the charger. I kept holding the power button for ten seconds. Nothing at all happened. I then took my finger off the power button and the fan started spinning for a second, stopped for a second, then started for another second and then did nothing else.

I'll check the PLT line in a second.
 
2informaticos

2informaticos

Administrator
Staff member
Which areas have been affected by liquid?

Check all SPI Bus Series Termination resistors and their traces.
Clean J6100; you may need to remove it, if corroded.
 
C

crea2k3

Member
Ok thanks I’ll check


Damage was sustained on R7523 (P5V_S4RS3_VFB1_R) which had gone high resistance and had corrosion attaching it to the nearby ground plane. This was replaced with another resister and corroded pad re tinned.

There was also corrosion between C1272 (PP1V05_S0_PCH_VCCACLKPLL) and C1297 (PP1V05_S0SW_PCH_VCCUSB3PLL).
 
C

crea2k3

Member
Iv had a look and j6100 is clean and has no corrosion at all. Iv had a look on the schemetic and see lots of references to spi, but not sure what you mean by the SPI Bus Series Termination resistors ?.
 
C

crea2k3

Member
Ok I have tested all resistors and traces and all testing good.

this is a video of what is happening with the board.

- YouTube

Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
youtube.com youtube.com
 
2informaticos

2informaticos

Administrator
Staff member
As you've mentioned corrosion under PCH/CPU area, check all voltages from page 11.
Be sure all resistors and small coils are good.
Use the capacitors as test points.
 
C

crea2k3

Member
PP3V3_S5 - 3.3v
P3V3_SUS - 3.3v
PP3V3_SUS - 3.3v


PCH VCCSDIO BYPASS / PP3V3_S0 / C1208 - 0.101v
PCH VCCSUSHDA BYPASS / PP1V5_S0SW_AUDIO_HDA / C1210 - 0v
(PCH 3.3V GPIO/LPC PWR) / PP3V3_S0 / C1212 - 0.100v
(PCH 3.3V THERMAL PWR) / P3V3_S0 / C1214 - 0.100v
(PCH 1.05V ME CORE PWR) / PP1V05_S0 / C1250 - 0.010v
(PCH 1.05V CORE PWR) / PP1V05_S0 / C1256 - 0v
(PCH 1.05V PCIe/SATA/USB3 PWR) / PP1V05_S0SW_PCH_HSIO / C1261 - 0v
(PCH 1.05V USB2 PWR)/ PP1V05_S0/ C1264 - 0v
PP1V05_S0//(PCH 1.05V CLK PWR)/C1266 - 0.010v
PP1V05_S0_PCH_VCCACLKPLL_R - 0.014
PP1V05_S0_PCH_VCC_ICC_R - 0.015
PP1V05_S0_PCH_VCCAPLL_OPI - 0.015
 
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