Apple macbook Pro Retina A1398 Battery not charging

[fisha]

Hallo everyone, my A1398 do not charging the battery and the battery also do not bin recognized. I did all the reset work, SMC reset and all the other reset options but nothing helped. on the SMC at pin 2 (DCIN) there are 20,4V coming in. at pin 16 (BGATE) which goes to the Q7155 Gate there are only 11,43V. at the pin 1,2 and 3 on the Q7155 (Source) there are 12,23V. Cap C7126 is not shorted. As I understand, the gate voltege have to by higher then the source voltege for the gate to clous so the battery can be charging, am I right? can someone help me with this? I guess that manny models are working the same.... I put hier the schematic file (Page 57). Thank you all and a nice weekend.

https://www.badcaps.net/forum/troubl...na-820-00426-a

[mon2]

Hello. Welcome.

1) If the mosfet is a N-channel type, then the GATE voltage must be higher than the voltage being passed through the source / drain pins.

2) If the mosfet is a P-channel type, then the GATE voltage must be lower than the voltage being passed through the source / drain pins.

3) Q7155 is a P-channel type so this is a normal operation for this battery mosfet. From the schematics, often you can get the part number and hunt down a detailed datasheet for the component to study the component.

Q7155 = SI7137DP.

Si7137DP MOSFETs | Vishay

4) What is the history of this unit? Just stopped charging? The fault may be due to the age of the battery and needs to be just replaced. Consider to source a compatible known good battery from Amazon for testing. You can always return it if it is not required.

5) Given that the laptop is operational except for this charging, the SMBUS lines should be ok but let us confirm. Remove all power. No battery. Meter in DIODE mode.

Red meter probe to ground, yes red.
Black meter probe to the point to test.

Measure each pin on the battery connector of the logic board (with no battery). You are checking for a possible shorted TVS ESD diode that is nearby and used to protect the SMBUS communication lines (SDA / SCL). These lines are used to extract the details of the battery and to charge, etc.

6) Still with no power -> configure the meter to the lowest resistance mode. Measure @ U7100 (pin 17 & pin 18). You are measuring the full resistance path of the battery charge circuit's current sense resistor. What is this measurement in ohms?

If this measurement does not match the schematic then the charger IC will power down the charging of the target battery.

7) Be sure the battery properly onto these contacts when you do put this together.

Since the battery is not even detected, the issue may be a physical contact fault; bad BMS board on the battery itself or a defective SMBUS line interconnect (ie. ESD killed the diode @ D7050). This dual diode is sacrificial after such an event but also tanks the communication line.

[fisha]

Hey and thank you for your answer.

4) What is the history of this unit? Just stopped charging? The fault may be due to the age of the battery and needs to be just replaced. Consider to source a compatible known good battery from Amazon for testing. You can always return it if it is not required.
One day I tryed to boot but its went in a boot loop (apple Logo agine and agine) and didnt boot. I opend the cover and I saw that the battery was bloated. I was reading at the web that at certain models, the mac will not boot if the battery is Bad.
I tryed 3 diffrent (new) batterys but there was no charging and no recognizing of the battery.


5) Given that the laptop is operational except for this charging, the SMBUS lines should be ok but let us confirm. Remove all power. No battery. Meter in DIODE mode.

The mac is working just fine with the DC adapter connected with a good battery inside. but still no charging and no recognizing of the battery but is boots only if a battery is connected and its not total empty. it muss be recognizing that there is somthing connected to the battery connector.??!!

Red meter probe to ground, yes red.
Black meter probe to the point to test.

Measure each pin on the battery connector of the logic board (with no battery). You are checking for a possible shorted TVS ESD diode that is nearby and used to protect the SMBUS communication lines (SDA / SCL). These lines are used to extract the details of the battery and to charge, etc.

There is no Shortcut between ground and SDA/SCL or any of the positiv pins of the battery. SDA= 0,95 (I think my mulimater shows kOhm, its a simple one) and SCL= 1,3 kOhm.

6) Still with no power -> configure the meter to the lowest resistance mode. Measure @ U7100 (pin 17 & pin 18). You are measuring the full resistance path of the battery charge circuit's current sense resistor. What is this measurement in ohms?
Between pin 17 and 18 there are 3,8 Ohms. is this how it should be?

If this measurement does not match the schematic then the charger IC will power down the charging of the target battery.

How much Ohm it should be? is this the sume of R7150, R7151 and R7152?

7) Be sure the battery properly onto these contacts when you do put this together.
Connecting was good (I have the logic board out of the case now;-)) but this I was chacking at the first;-))



do you have any further idea maby?

many many grateful thanks for you time,
Tal

[mon2]

SDA= 0,95

What are the units of measurement? Is this kohms? If yes, then ok. Confirm it. Be sure the battery is not attached during these tests.

Between pin 17 and 18 there are 3,8 Ohms. is this how it should be?

Seems a bit high. Touch your meter probes together. What is the resistance measurement?

Next, place the probes across R7151 resistor and you should have ~2R2 ohms. Confirm it. Likewise for R7152 should be ~0 ohms since this is a 0 ohm resistor.

Locate the dual diode @ D7005.

Confirm the voltage @ D7005, pin # 3 with only the power adapter attached. Check the voltage to ground of pin # 2 (still with only the power adapter attached). We are checking if this dual diode is leaky or not.

[fisha]

What are the units of measurement? Is this kohms? If yes, then ok. Confirm it. Be sure the battery is not attached during these tests.

Yes, kOhm (see atached pic.)

Between pin 17 and 18 there are 3,8 Ohms. is this how it should be?


Seems a bit high. Touch your meter probes together. What is the resistance measurement?

0,001 kOhm on diode mode
00,7 Ohm at 200 Ohm mode


Next, place the probes across R7151 resistor and you should have ~2R2 ohms. Confirm it. Likewise for R7152 should be ~0 ohms since this is a 0 ohm resistor.

R7151 = 2,9 Ohm
R7152 = 0,7 Ohm

due to resistens of the Probe

Locate the dual diode @ D7005.

Confirm the voltage @ D7005, pin # 3 with only the power adapter attached. Check the voltage to ground of pin # 2 (still with only the power adapter attached). We are checking if this dual diode is leaky or not.

D7005 pin 3= 19,9 V
pin 2= 12,3 V
pin 1= 20,1 V


Thanks,
Tal

[fisha]

I just checked the R7005 and R7020 next to the D7005. there are OK.

[mon2]

The above measurements look ok, so far.

You may want to test with another known good charger because this unit requires the original 85W or higher. No clones.

With both the adapter & battery connected, what is the voltage to ground on the battery connector pins for:

SMBUS_SMC_5_G3_SCL
SMBUS_SMC_5_G3_SDA

* fairly sure this again ok since the ISL charger chip does get boosted (so SMBUS lines are ok) to power the logic board so may be redundant but is a quick check


Remove all power / no battery.

Meter in 2M mode. Locate the battery mosfet @ Q7155.

Measure the resistance across this mosfets pins. We are checking for a lower than normal measurement to see if this mosfet is leaky or not.

Measure:

source (1-2-3) & drain (5-6-7-8) ; pin any pin from each group
source (1-2-30 & gate (4)
gate (4) & drain (5-6-7-8)

Post each measurement.

Also, during normal boot time, the PPBUS_G3H rail = Q7155 (1-2-3) = source pins = 12v6. Confirm it. This voltage will only be boosted provided the SMBUS (SCL/SDA) lines are not stuck and the SMC performs this task using the same interconnect lines to dial up this higher voltage.

[Sephir0th]

I'd check voltage of U7100 ACIN, VDD, VDDP, SMB_RST_N too to have a more complete picture of the situation. And do you get ACOK by any chance?

Also resistance between CSIP and CSIN

[fisha]

@mon2,
at the schematics (see above) is writen that on the pin 2 (D7005) should be 18.5V but I messered only 12,3V is this OK?

With both the adapter & battery connected, what is the voltage to ground on the battery connector pins for:

SMBUS_SMC_5_G3_SCL 3,11 V
SMBUS_SMC_5_G3_SDA 3,04 V

mosfet @ Q7155
source (1-2-3) & drain (5-6-7-8) ; pin any pin from each group = 0 V
source (1-2-30 & gate (4) = OL
gate (4) & drain (5-6-7-8) = OL


Also, during normal boot time, the PPBUS_G3H rail = Q7155 (1-2-3) = source pins = 12v6. Confirm it. = 12.22 V

@Sephir0th:

U7100 (only Adapter, NO Battery connected):
ACIN 9,2 V (AC)
VDD 5,5 V
VDDP 5,5 V
SMB_RST_N 3,13 V

[fisha]

@Sephir0th:

Also resistance between CSIP and CSIN = 21,5 Ohm (no adapter and no battery connencted)

What should i measure at the ACOK?

[fisha]

@mon2,

the power adapter is original:-)))....85W

thank you all again for your time....

[mon2]

Does this unit power up with the power adapter to the desktop? Does the MagSafe led function?

Similar case:

https://boards.rossmanngroup.com/thr...harging.60881/

[fisha]

Yes, this macbook is booting and works with the power adapter totaly normal but only when the battery is charged and above certain voltage. as soon as the battery loose power, the macbook does not boot any more and goes to the "Boot loop". (as I wrote at the begining: this model is powering up with a MegaSafe only whene there is a battery connected and this battery is not totaly empty. Whene the battery is goes low, I have to charge it for a short time outside the cover.

The MegaSafe turn on green and then goes orange as it should be.

[mon2]

Yet, PPBUS_G3H is only 12v22? This is too low. Should be 12v6 for a normal unit.

[mon2]

ACOK (SMC_BC_ACOK) can be probed at resistor R5187. Confirm the voltage to ground on each side of this resistor. The SMC boosts the voltage of PPBUS_G3H.

[fisha]

sould i measure with adapter AND battery connected or its enough only with adapter?

[fisha]

the R 5187 next to the U5000 have glue on it so I have to measue (with DC and battery connected) at
L5001 = 3,44 V
and at U7100 pin 14 = 2,34 V

[mon2]

Test both ways. This PPBUS_G3H rail should be 12v6 if all is well.

The voltage of SMC_BC_ACOK is important to note since this will allow for the SMC to perform its duty after the adapter is considered to be OK.

[mon2]

With no power -> measure the resistance across R5187.

[fisha]

R5187 is OK = 470 kOhm.