LA-G078P not charging

[Dinneke]

LA-G078P not charging when power is on.
Charges good when power=OFF.
epw50 la-g07fp schematic used

[mon2]

Re: LA-G078P not charging

Are you using the official and recommended power adapter for this unit?

If not, the logic board can be throttled and battery charging can be impacted due to a weaker power source.

[Dinneke]

Re: LA-G078P not charging

It's original

[mon2]

Re: LA-G078P not charging

Any schematics available for this board?

Locate the dcin connector -> nearby should be 2x dcin mosfets. What are their topside markings?

Nearby should be the charger IC that drive the dcin mosfets. What are the topside markings of the charger IC?

Post close up pics if this region.

From these details, we can better understand the charging portion of the logic board.

[Dinneke]

Re: LA-G078P not charging

Schematic not available
epw50 la-g07fp schematic used

[Dinneke]

Re: LA-G078P not charging

Bq24725

[FrozenHaxor]

Re: LA-G078P not charging

This behavior is typical when you use a lower wattage adapter type than the product calls for, can you post what is reported as the detected AC adapter in BIOS and what is the adapter recommendation written on the bottom cover of the laptop?

[aldopc]

Re: LA-G078P not charging

This behavior is typical when you use a lower wattage adapter type than the product calls for, can you post what is reported as the detected AC adapter in BIOS and what is the adapter recommendation written on the bottom cover of the laptop?

check https://www.badcaps.net/forum/showthread.php?t=97719

[FrozenHaxor]

Re: LA-G078P not charging

check https://www.badcaps.net/forum/showthread.php?t=97719

That does not apply here, if the Adapter identification part of the board was shorted by the transient diode, he would not get charging when the laptop is off.

[Dinneke]

Re: LA-G078P not charging

It's a HP, bios state no charger information, it needs 45W and that's charger i used, tseted an known good charger

[mon2]

Re: LA-G078P not charging

Measure the voltages on mosfet PQB13 for both cases.

Post the readings.

[Dinneke]

Re: LA-G078P not charging

PQB13 Drain 19V Source 13V when charging
Drain 11V Source 11V when ON not charging

[FrozenHaxor]

Re: LA-G078P not charging

Measure pin 5 and 6 of BQ24725 while charging and not charging.

[Dinneke]

Re: LA-G078P not charging

P5 3,2 V charging
P6 2,6V charging
when not charging, power ON no change

[mon2]

Re: LA-G078P not charging

The gate voltage readings were not posted for PQB13.

[Dinneke]

Re: LA-G078P not charging

Gate
13V charging
17V not charging