820-00165 water damage... missing pm_slp_s4_l

carlosqg76

New member
hi... iam tryning repair a 820-00165 with water damage....i fix green orange light chande smc and J9500 with corrosion, now i have a nice green-orange in the charger....

ppbus_g3h. 8,59v
pp3v42_g3h. 3,42v
pp3v3_s5. 3,3v
pp5vs4rs3. 0.00v
pm_slp_s4_l 0.00 v no short to ground....when remove r7551 i have 5.100v in pp5vs4rs3 so u7501 is good
ppvrtc_g3h. 3.3 v
pp3v3_sus. 0,0 v. pm_slp_sus_l missing and not short to ground
to remove j9500 use air station below logicboard ..... that may be the cause

please help
 

2informaticos

Administrator
Staff member
What about PM_BATLOW_L and SMC_ADAPTER_EN?
Be sure to use original Magsafe 2 charger.

Also check PCH's RTC signals.
 

carlosqg76

New member
ok same news.....i apply hot in pch with air station at 180º and flux amtech.......now fan spin chime and boot in to os
there is another problem in the logicboard... no keyboard and tradpad
i probe another good keyboard and flex cable and tradpad but nothing....any idea pleased
 

2informaticos

Administrator
Staff member
Looks like accumulated crap underneath CPU/PCH.

TP/KB work before macOS login?
Try to access boot menu...
 

carlosqg76

New member
sometimes I can see the light of the shift keys before login ... I have even been able to type in the login but I have not been able to enter the boot menu by pressing the alt key...now it doesn't work anymore
 

2informaticos

Administrator
Staff member
TP talks with PCH in USB mode, before enters to macOS.
Once logged in, SPI mode is used.
So you must confirm if both ways bad, or not.
Access macOS with external keyboard and check.
 

carlosqg76

New member
Although it seems incredible, I do not have a USB keyboard here now .... I am on vacation ... but I have used an arduino per USB configured as a keyboard ... and if the arduino writes in the login
 

carlosqg76

New member
I have measured something in j4800 ... pin 2 tpad_spi_miso_r is 0.0 v .. this pin is output ... shouldn't it measure 3.3v?
 

carlosqg76

New member
ok correccion...
i get a usb keyboard. login in to os x with usb keyboard and TP/KB dont work
KB/TP dont work before and after login os x...dont work to enter boot menu
 

carlosqg76

New member
ok i fix the problem...there was two lines in u4810 with traces broken....pin 1,5,6 0.0v because traces broke.....fix it... now keyboards is working again
thamks you very much
 
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