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820-00850 No power / No H2O

G

goldminer76

Member
No water damage.

DC IN = 5.20V 19.24ma except one port is 5.20v 18.92ma

PPDCIN_G3H = 5.2v
PPBUS_G3H = 0.00
PPVIN_G3H_P5VG3S = 0.00v
PPVIN_G3H_P3V3G3H = 0.00v


LDO DIODE MODE=
UB300
PIN 2 -PP1V8_UPC = 0.443
PIN 35 -PP1V1 = 0.449
PIN 53 -PP3V3= 0.484
PIN 75- PP1V8 =0.464

U3100
PIN 2 -PP1V8_UPC = 0.467
PIN 35 -PP1V1 = 0.484
PIN 53 -PP3V3= 0.480
PIN 75- PP1V8 =0.504

U3200
PIN 2 -PP1V8_UPC = 0.449
PIN 35 -PP1V1 = 0.478
PIN 53 -PP3V3= 0.482
PIN 75- PP1V8 =0.467

UB400
PIN 2 -PP1V8_UPC = 0.437
PIN 35 -PP1V1 = 0.453
PIN 53 -PP3V3= 0.483
PIN 75- PP1V8 =0.468
 
2informaticos

2informaticos

Administrator
Staff member
No 3V3_G3H, so cannot get 20V on USB-C power port.
Post first diode mode there and check CHGR_EN_MVR level.
On U7000, check AUX_DET and VDDA/P voltages.
 
G

goldminer76

Member
JB500 DIODE MODE

PP20V_USBC_TA_VBUS =
PIN 60/59 = 0.124
PIN 58/57 = 0.124

TP_USBC_PP20V_TA = .0L

TP_USBC_PP20V_TB = .OL

J3300 DIODE MODE

PP20V_USBC_XB_VBUS =
PIN 60/59 = 0.125
PINS 58/59 = 0.125

TP_USBC_PP20V_XA = .0L

TP_USBC_PP20V_XB = .0L


U7000
CHGR_EN_MVR
DIODE = O.576
voltage = 1.29v

CHRGR_VDDP = 5.07V
VDDA = 5.07V
 
2informaticos

2informaticos

Administrator
Staff member
Please read the posts, do not waste the time.
I do not remember to asked you about J3300, or JB500...

"check AUX_DET"
???
 
G

goldminer76

Member
I did read the post. I misunderstood what you meant and forgot to put AUX_DET. YOU"RE are a machine!! and I know you have this whole forum to help out but can you elaborate on what you meant by "cannot get 20V on USB-C power port.
Post first diode mode there" That will help me better understand what you meant so that I don't waste anymore time. I thought that meant to post Diode mode on 20v lines at the USB-C power port. You are greatly appreciated!!

AUX_DET = 1.293v
 
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G

goldminer76

Member
Crystal. Thank you and I will get better at understanding the instructions. You are the Man! The USB-C Macs are new for me.

3V3_G3H = 0.383 (DIODE MODE)
 
2informaticos

2informaticos

Administrator
Staff member
"Diode mode F7000
PIN 1 = 0.00
PN 2 = 0.00"
If these are real diode mode to ground values, you have short on PPBUS_G3H.
Please confirm if is the case...
 
G

goldminer76

Member
What is the best way to find that short given that all of the line is shorted? I'm still having trouble with that. I know I could start pulling components off but that would be a lot of work. Is it by voltage drop at different points or...Diode mode? This is something I need to brush up on and understand. I would be in your debt if you could just lead me even in the right direction and I can research proper procedure.

What I've read or seen is that you can use Ohms mode and test components. As you get further away from the short there will be more resistance.
 
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G

goldminer76

Member
Or if I find components that are closer to 0.00 in diode on the shorted rail should I inject voltage on those components and see what heats up?
 
2informaticos

2informaticos

Administrator
Staff member
You can check for USB activity, with the board on the desk.
Or even external video, with proper HDMI adapter.

Do NOT do the error to inject again voltage in the same manner into PPBUS_G3H!!!
You had ton of luck this time; don't force your luck.
 
G

goldminer76

Member
aHHH. OK. I don't like luck. Where would be a proper place to inject power? I see Louis trying to find shorts that way but he usually takes off a component to figure out which side of the line from that component is short. It was an older video though maybe there is a better way. What would be the better, safer, place to test the board by injecting power on the PPBUS_g3h rail?
 
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