820-00165 water damage

Hi, I´m working on this board, was liquid damage

PP3V3_G3H=8.58v
pp3v42_g3h=3.4v
pp3v3_S5=3.35V
PP5V_S0=5.15
L3095=0V
L7701=0V

Fan spin ok
 
I checked it with thermal camera and found out that U4500 got very hot 5 seconds after connected with the charger and no battery, should be replaced?, how I can check if this IC its ok?
 

2informaticos

Administrator
Staff member
You can remove it.
I bet the client doesn't need SD card reader anyway.

Is there any chance to check for USB activity???
 

2informaticos

Administrator
Staff member
Don't be so sure; read this...
 
I put it all together and when i push the power button now it shows on the screen battery icon with low red battery at 20.13v and 0.047 A to 0.615 A and then its turn off and no green or yellow light on the charger
 
ok , I started in SMC bypass mode and the laptop start normally with the fan at max speed, and when I restarted shows the same screen with the low battery sign, so what do you suggest?
 

2informaticos

Administrator
Staff member
20V power for an Air, why???
Don't you have original 45W Magsafe 2 charger?
It should work with 60/85W too, but none of them will send out 20V!!!
 

2informaticos

Administrator
Staff member
Use original charger, or lab PSU with less than 18V; preferible 15-16V.
20V triggers SMC_DCIN_VSENSE.
This is the reason why machine starts in SMC bypass only.
 
ok, I use now a 60W MacSafe2 and PPDCIN_G3H= 16.53v and PP5V_S4RS3=5.16v but no green or yellow light and shows the screen with the low battery
 

2informaticos

Administrator
Staff member
What is the exact PPBUS_G3H voltage?
Check it w/ and w/o battery connected.

Did you try known good LIO board/flex?
 
changed the LIO board/flex for a new one and Its work OK!! the USB-C tester with one T-tip adapter from china sucks!
Men, you are the BEST! thank you very much!
 
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