modesto1993
New member
hi everyone, logic board with no sign of liquid, no ignition, I receive 5 V on the PP20V_USBC line but nothing on the PP3V3_G3H line
-
For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.Subscribe Now
820-00840-A no power only 5V on PP20
- Thread starter modesto1993
- Start date
What the client said about how the problem appeared?
Check if he uses original, or fake charger.
Check LDOs of both CD3215 chips.
Compare diode mode readings with good board.
Check if he uses original, or fake charger.
Check LDOs of both CD3215 chips.
Compare diode mode readings with good board.
modesto1993
New member
The problem occurred suddenly while the computer was on, it shut down and from there no sign of life. Original charger. Tomorrow I'll try to take other measurements, I don't have a good board for the values...
modesto1993
New member
Pp1v8_upc_xb_ldod 0.48 website 0.48
Pp1v8_upc_xb_ldoa 0.53 website 0.52
Pp1v8_upc_xa_ldod 0.48 website 0.48
Pp1v8_upc_xa_ldoa 0.52 website 0.52
Pp3v3_upc_xa_ldo 0.51 website 0.50
Pp3v3_upc_xb_ldo 0.51 website 0.50
Pp1v8_upc_xb_ldoa 0.53 website 0.52
Pp1v8_upc_xa_ldod 0.48 website 0.48
Pp1v8_upc_xa_ldoa 0.52 website 0.52
Pp3v3_upc_xa_ldo 0.51 website 0.50
Pp3v3_upc_xb_ldo 0.51 website 0.50
Check their voltage too.
Be aware, 1V1_LDO should only appear on the powered port.
Be aware, 1V1_LDO should only appear on the powered port.
modesto1993
New member
1v1_LDO is 0V XA and XB
PP1V8_UPC_XA_LDOD 1.78V
PP1V8_UPC_XA_LDOA 1.78V
PP3V3_UPC_XA_LDO 3.28V
PP1V8_UPC_XA_LDOD 1.78V
PP1V8_UPC_XA_LDOA 1.78V
PP3V3_UPC_XA_LDO 3.28V
Post U6960 voltages.
modesto1993
New member
U6990? Why can't I find what you indicate...
Yeah U6990; sorry for typo.
modesto1993
New member
V3V3 G3 H- boost 0V
PPVIN-G3H-P3V3G3H 1,75 V
V3V3G3H-SW 0V
Agi ND-P3V3G3H 0V
V3V3G3H-BIAS 0.04V
V3V3G3H-FB 0V
PM-EN-P3V3-G3H 2.67 V
PPVIN-G3H-P3V3G3H 1,75 V
V3V3G3H-SW 0V
Agi ND-P3V3G3H 0V
V3V3G3H-BIAS 0.04V
V3V3G3H-FB 0V
PM-EN-P3V3-G3H 2.67 V
Last edited:
"PPVIN-G3H-P3V3G3H"
Diode mode there?
Check R6906 and D6905.
Diode mode there?
Check R6906 and D6905.
modesto1993
New member
PPVIN-G3H-P3V3G3H" Diode mode 0
R6906 Diode mode 0 resistance 0.28ohm
D6905 ppbus_g3h 0.424
D6905 PPDCIN-G3H-CHGR 0
D6905 PPVIN-G3H-P3V3G3H 0
I realized that I performed the measurements with the power supply connected, without it all the values are completely different and therefore I rewrite them below:
PPVIN-G3H-P3V3G3H" 0.26
R6906 Diode mode 0 resistance 0.33ohm
D6905 ppbus_g3h 0.424
D6905 PPDCIN-G3H-CHGR 0.570
D6905 PPVIN-G3H-P3V3G3H 0.265
R6906 Diode mode 0 resistance 0.28ohm
D6905 ppbus_g3h 0.424
D6905 PPDCIN-G3H-CHGR 0
D6905 PPVIN-G3H-P3V3G3H 0
I realized that I performed the measurements with the power supply connected, without it all the values are completely different and therefore I rewrite them below:
PPVIN-G3H-P3V3G3H" 0.26
R6906 Diode mode 0 resistance 0.33ohm
D6905 ppbus_g3h 0.424
D6905 PPDCIN-G3H-CHGR 0.570
D6905 PPVIN-G3H-P3V3G3H 0.265
Last edited:
Seems that you didn't understand what I asked about R6906 and D6905.
I didn't say anything about checking them in respect with ground!
Do you know how to check a resistor, or diode?
Remove them from board, if you don't know other way.
I hope you will not give diode mode to ground readings, once components are not soldered on the board.
About the short to ground, remove C6990/1 and see if gone from PPVIN_G3H_P3V3G3H.
I didn't say anything about checking them in respect with ground!
Do you know how to check a resistor, or diode?
Remove them from board, if you don't know other way.
I hope you will not give diode mode to ground readings, once components are not soldered on the board.
About the short to ground, remove C6990/1 and see if gone from PPVIN_G3H_P3V3G3H.
modesto1993
New member
I corrected my previous post, I had done the measurements with the power supply connected.
If there is a need to remove them from the board I will do it, it's not very clear to me, sorry
If there is a need to remove them from the board I will do it, it's not very clear to me, sorry
Last edited:
No need to remove them from board; just check ohm scale BETWEEN their pins.
Where diode mode to ground is specified, do it as normal.
But keep in mind, ALWAYS remove power (charger AND battery) when check in diode mode, or ohm scale!!!
Where diode mode to ground is specified, do it as normal.
But keep in mind, ALWAYS remove power (charger AND battery) when check in diode mode, or ohm scale!!!
modesto1993
New member
R6906 0.28
Do I measure the D6905 with black to ground? If these are the values:
Pin 1 3.7 M ohm (it is worth very unstable)
Pin 2 118k ohm
Pin 3 0.427k ohm
Do I measure the D6905 with black to ground? If these are the values:
Pin 1 3.7 M ohm (it is worth very unstable)
Pin 2 118k ohm
Pin 3 0.427k ohm
"Do I measure the D6905 with black to ground?"
NO!
Don't really know how to check a diode?
How will you check it out of board (no ground available)???
Is a DIODE; check it in diode mode between their pins.
You should get indication one way; and OL in reverse way.
At least post voltage on their pins (to ground), before removing it; charger connected.
NO!
Don't really know how to check a diode?
How will you check it out of board (no ground available)???
Is a DIODE; check it in diode mode between their pins.
You should get indication one way; and OL in reverse way.
At least post voltage on their pins (to ground), before removing it; charger connected.
modesto1993
New member
black pointer on pin 2
pin 1 1.24
pin 3 0.23
black pointer on pin 1
Pin 2 0
Pin 3 0.94
black pointer on pin 3
Pin 1 0.23
Pin 3 0
This is without power supply
pin 1 1.24
pin 3 0.23
black pointer on pin 1
Pin 2 0
Pin 3 0.94
black pointer on pin 3
Pin 1 0.23
Pin 3 0
This is without power supply
Strange way to check it.
You had to check pins 1-3 and 2-3.
Anyway, diode looks good.
"At least post voltage on their pins (to ground)"
?
You had to check pins 1-3 and 2-3.
Anyway, diode looks good.
"At least post voltage on their pins (to ground)"
?