la-d101p laptop having bq24780 charging ic the problem is no voltage on gate of input mosfet.charging ic has vcc 19v ,acdet 2.7 v,acok 0v, acdrv 0v. schematic is not available please how to solve this problem
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Last edited by ahmarzo; 02-07-2023, 05:07 AM. -
Re: la-d101p battery not charging
Hi.
Remove the ~4k series resistor on the ACDRV pin of the charger. Then measure again on the ACDRV pin. Do not lose this resistor.
Do you now have ~25v on ACDRV ?
Measure also the voltage of REGN pin.
Often the fault is in the 2nd DCin mosfet that gets damaged but start with these tests. -
Re: la-d101p battery not charging
hi thanks for reply
after removing 4k resistor acdrv is same 0v and regn on pin no 24 is 6v. after removing second mosfet acdrv starts.i have changed it but problem remains same.Last edited by ahmarzo; 02-07-2023, 05:36 AM.Comment
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Re: la-d101p battery not charging
Remove all power. Meter in resistance mode. Measure the resistance to ground of each coil on the board. This is to confirm there is no shorted part on a power rail. Check for low resistance readings.
Q: does the laptop work but does not charge?
If it does not power, continue to measure.Comment
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Re: la-d101p battery not charging
the laptop works fine when i pass the input voltage on first mosfet and yes it does not chargeComment
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Re: la-d101p battery not charging
Can you post a pic of this area of the logic board?
Sometimes, the designs will feature a discharge mosfet (SOT-23 / SC-70 package) that causes issues. Often, it is placed between the first and 2nd DCin mosfet.
If present, remove it and test again.
Also, confirm the details of the DCin mosfets -> remove all power -> meter in resistance mode.
Measure the resistance across the mosfet pins:
source (1-2-3) & drain (5-6-7-8)
SOURCE (1-2-3) & GATE (4)
GATE (4) & DRAIN (5-6-7-8)
Post each measurement of each DCin mosfet. If the reading is low, the mosfet is defective and must be replaced.Comment
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Re: la-d101p battery not charging
Problem is not ACDRV but ACOK which is zero.Comment
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Re: la-d101p battery not charging
how about injecting 10v on the source of the second mosfet and measure the voltage on the battery +.if you get 10v then its a bad mosfet.Comment
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Re: la-d101p battery not charging
Clear No NO. Why play with voltage injection without diagnosing the fault and that too with 10V?? I see another post from you advising to inject 19V. these are almost sure way to kill a mb instead of getting them fixed.
Mb doesnt take much time to get repaired but it may take much time in diagnosing it and thats where patience is a pre-requiste.Comment
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Re: la-d101p battery not charging
Ok.Comment
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My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?
Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?
My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
I have tried multiple different Dell power adapters. My Dell... -
Hi all
We have in a HP ProBook 445 G8 laptop with AMD Ryzen 7 CPU. When power is connected the power LED light blinks 5 times then stops. Normally HP laptops will blink this LED 10 times as it does a self test when the AC adaptor is inserted. So there must be some sort of short somewhere.
The battery doesn't charge, and is erratic on the MM voltage. Bench PSU LED pulsates when the battery is connected also. So the fault must be on the charging circuit?
I have gone around the board with a MM and cant find anything
Windows shows the battery fine,... -
1. Some theory
1.1. Introduction
Almost every laptop has a charging circuit of some sort, that does a few things:- Manages switching between AC adapter and battery power
- Manages battery charging and generates power rail to charge battery
There are 2 different designs to handle switching between AC adapter and battery power and feeding the system:- Hybrid power boost (HPB) and traditional circuits without power boost (see Warning in HPB section)
- Narrow VDC (NVDC)
Texas instrument has a nice overview of these technologies with some more details at https:... -
since i couldn't find schematic or boardview for this model (LA-K062P), i use closest board model found here https://www.badcaps.net/forum/troubl...-and-boardview
the schematic share same marking for each component, using same PD-Controller, same BQ25710, the only different is the battery cell used. LA-K061P uses 3S battery while LA-K062P use 4S battery per schematic.
what i've done:
- flashing... -
Hey All!
Long time forum member here with a problematic laptop issue!
I got a RZ09-0196 with a bloated battery (still worked and charged fine) I pulled the old cell pack out and installed a new cell pack in its place.
The laptop would not power on with the new battery installed without the power supply being plugged in.
When booting into Win10 (all up to date BTW) I saw the battery icon with 49% plugged in not charging.
TL;Dr version, old battery worked, charged but was bloated, installed a new non OEM replacement, laptop/windows...
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