HP Envy 13" X360. Not getting AC power.

[Indycanard]

I've been troubleshooting a failed laptop for a few months now. It's a personal project and I thought it would be easy. Not so much I'm figuring out. The motherboard is a DAYODPMBAFO, I found a schematic for QUANTA Y0DP REV 1A DAY0DPMBAF0 (HP ENVY X360 13-Y023CL), although my board is Rev F.
Symtoms:

Neither A/C power or battery charge light turn on when plugged in. Laptop does boot into windows with battery power, however the battery icon shows no charging or presence of the ac adapter.

Both input mosfets appear good. I can measure the 19V past both mosfets. In checking the bq24780S Charge IC, plugged in (without and with the battery connected), I get the following voltages at the bq24780S:

See attached for measurements and schematic.

I have replaced the bq24780S charge IC chip.
Additionally, when I have the battery and Adapter both connected, the PQ21 mosfet gets extremely hot. I replaced hoping that would resolve my issue, however the new mosfet also gets hot. I'm unsure where to look now. I see I have fluctuating voltages, and the ACOK signal is going from 0 to 2.4V with the same frequency as the other measured voltages are swinging.

Bad input mosfet? It looks like they are working well, except for the gate voltages are fluctuating with the ACOK signal.

[Techtiger]

Re: HP Envy 13" X360. Not getting AC power.

are you using the original adapter? upload the schematic section. BQ REGN is connected to ACOK with an R1 R2 divider. It should be 0-3.3V max on your platform; 1.84V is less (with the adapter only). Trace it back to two components to test with a multimeter in diode mode without power

[Techtiger]

Re: HP Envy 13" X360. Not getting AC power.

There are multiple faults with the measurements. For PQ21, the gate threshold value is high +21V, which will pass to the battery terminals (4, 5, 6). What supply are you getting for the drain and source? The battery is not detected by the Master and Slave. It may be a bad battery. What supply do you get for PQ4, PQ5, S, D, and G

[Indycanard]

Re: HP Envy 13" X360. Not getting AC power.

There are multiple faults with the measurements. For PQ21, the gate threshold value is high +21V, which will pass to the battery terminals (4, 5, 6). What supply are you getting for the drain and source? The battery is not detected by the Master and Slave. It may be a bad battery. What supply do you get for PQ4, PQ5, S, D, and G

All these measurements are with adapter plugged in with battery connected.


PQ21
D 11.5-15
S 11.5-13V
G 12.5 (not sure how I measured 21V before). Seems stable at 12.5V now
PQ4
D 11-15V
S 11-15V
G 11-15V
PQ5
D 11.5-15
S 11.5-15
G 11.3-21V


REGN6V (pin 24 of Charger IC) = 6.05V

ACIN (ACOK - Pin 5 of Charge IC) = 0V to 3V (alternating)


Note: charger is original (and I have a second identical, same issue). Battery will boot laptop, and is holding a charge. I have a second battery, same result.

[Techtiger]

Re: HP Envy 13" X360. Not getting AC power.

test PQ4 and PQ5 for S D G supply without a battery update? Afterward test PQ21 for S D G supply without AC adapter update ? for ACIN test on PR106 and PR107 using the multimeter's resistance mode for update?. Is the voltage alternating on the input side of PR106?

[Indycanard]

Re: HP Envy 13" X360. Not getting AC power.

test PQ4 and PQ5 for S D G supply without a battery update? Afterward test PQ21 for S D G supply without AC adapter update ? for ACIN test on PR106 and PR107 using the multimeter's resistance mode for update?. Is the voltage alternating on the input side of PR106?

Without Battery:
PQ4
D 19.49V
S 19.54V
G 17.88V

PQ5
D 19.49V
S 19.42V
G 21.77V

PQ21
D 19.92V
S 19.42V
G 19.81V

ACIN 1.83V (steady) (common to PR107 and PR108)
REGN6V (pin 24 of Charger IC) = 6.05V

PR106 => This revision does not have a PR106 populated. I wish I has a schematic for this Rev F. However PR106 on previous Revs connected to PU12, pin 3. Measuring that pin finds 0 volts. I'm thinking you were asking about PR107 and PR108 (resistors connected to ACOK).

PR107 resistance:84K
PR108 resistance: 85K


Without Adapter
PQ21
D 11.22V
S 11.21V
G 12.55V

REGN6V (pin 24 of Charger IC) is still = 6.05V
ACIN (ACOK) = 0V (steady)(common to PR107 and PR108)

[Indycanard]

Re: HP Envy 13" X360. Not getting AC power.

One further data point. During my initial evaluation, I found PQ21 becoming very hot. I desoldered it and removed it to replace it. While PQ21 was removed, I plugged in to AC and the power/charge light illuminated. I did not try to boot the board, but I suspect it would have.
Not positive if it was white (AC Power) or orange (Charging), however with PQ21 reinstalled, the light was dark.

[Techtiger]

Re: HP Envy 13" X360. Not getting AC power.

Regarding the measurements for PQ21, when only the adapter is connected, the power supply should cease at the drain. However, in your case, the power supply is crossing over to the battery when the battery is connected. At this moment, the two power supplies will conflict with each other, which is why PQ21 is experiencing a leak again (hot)

[Techtiger]

Re: HP Envy 13" X360. Not getting AC power.

One further data point. During my initial evaluation, I found PQ21 becoming very hot. I desoldered it and removed it to replace it. While PQ21 was removed, I plugged in to AC and the power/charge light illuminated. I did not try to boot the board, but I suspect it would have.
Not positive if it was white (AC Power) or orange (Charging), however with PQ21 reinstalled, the light was dark.

As for the details you have uploaded, without PQ21, the (Mob) has to boot the SIO, and the BQ Master & Slave have to identify whether an adapter is present (AC) and the power/charge light is illuminated. After that, remove PQ21 and power the Mob without the battery. Update?

[Indycanard]

Re: HP Envy 13" X360. Not getting AC power.

As for the details you have uploaded, without PQ21, the (Mob) has to boot the SIO, and the BQ Master & Slave have to identify whether an adapter is present (AC) and the power/charge light is illuminated. After that, remove PQ21 and power the Mob without the battery. Update?

Are you recommending I again remove PQ21 and try to power up the mob? Any idea why "the power supply is crossing over to the battery when the battery is connected."?

[Techtiger]

Re: HP Envy 13" X360. Not getting AC power.

Yes, you can power the Mob without the PQ21 without the battery. There may be a faulty component in the BQBATDRV line, or you may have to flash the BIOS, etc

[Indycanard]

Re: HP Envy 13" X360. Not getting AC power.

Yes, you can power the Mob without the PQ21 without the battery. There may be a faulty component in the BQBATDRV line, or you may have to flash the BIOS, etc

I removed PQ21. As suspected, the laptop powered on and booted to windows.

I measured PQ21 pads (with PQ21 removed)

PQ21
D ~19.5V
S 0 V
G 0 V

I then plugged in battery (still without PQ21 reinstalled):

PQ21
D ~19.5V (AC voltage)
S ~12.21V (Batt Voltage)
G ~12.21V

I was surprised to see the Gate at 12.21V. It isn't coming from BQBATDRV. According to the schematic, PC248 (0.01U/50V) capacitor connects the S to G. Could PC248 be my problem? Is it shorted out?

[mcplslg123]

Re: HP Envy 13" X360. Not getting AC power.

What was the original part number for PQ21? The replacement fet is same or any other mosfet? If not same, mention the replacement part number.

[Indycanard]

Re: HP Envy 13" X360. Not getting AC power.

What was the original part number for PQ21? The replacement fet is same or any other mosfet? If not same, mention the replacement part number.

Schematic identifies PQ21 as FDMS7698

Markings on original removed MOSFET is 6370 GV5S1C

I replaced removed original MOSFET with a FDMS7698.

Currently still removed as I consider replacing PC248 if it would resolve my issue.

[Indycanard]

After letting this repair sit for quite a while, I thought I would take one last try to repair this MB. I finally found the bad capacitor! It was on the 5V usb circuit (current limiting IC circuit) for the USB-C port. I removed that cap, and now the laptop is charging and otherwise back working. I haven't replaced the cap, just removed it and left it off.

[mon2]

This is one capacitor that should be present and serves as an in-rush current limiter for the USB's VBUS power rail. From the USB spec, this capacitor should be 120uf or higher. Suggest the voltage rating of this cap to be 16v or higher.

[Indycanard]

This is one capacitor that should be present and serves as an in-rush current limiter for the USB's VBUS power rail. From the USB spec, this capacitor should be 120uf or higher. Suggest the voltage rating of this cap to be 16v or higher.

Thank you for the quick response. I'm going to replace this capacitor then, and need a hand deciphering the value. The schematic shows "220U/6.3V/ESR35_3528". I got it all figured out except the ESR value. would that be 35 mOhms? I can't find any 35 ohm at Mouser. If mOhm, then this capacitor at Mouser: T55B227M6R3C0035. Does that seem right?

[mon2]

Correct - the table below the text confirms the mOhms. The lower this value, the better the quality of the cap.