i have these la - f401p motherboard that i am working on. the problem is that it does not charge the battery up it only shows its charging but does not go up. attached is the picture of how it looks. can anyone help me.
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1) Confirm that the power adapter @ 90W matches the actual power adapter's markings. Confirm this adapter is suitable to run this logic board.
2) It is possible that the battery may be old or defective. If possible, test with another known good battery or test this battery inside of another working logic board.
3) Remove all power. Meter in lowest resistance mode. Short your meter probes and note the resistance of the shorted probes.
Locate the charger IC @ PU901. With no power to the board / no battery connected; measure the resistance between pins 1 & 2 on this charger IC.
We are confirming the full current resistance path for the battery leg of the circuit. Post the measurements. -
sir should the red prob be on ground to check or red on pin 1 and black on pin 2Comment
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measuring the resistances between the pin 1 and 2 002.2oms
but to ground is 0L for both sideComment
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These are good measurements. The total path of the battery charge resistors = 1 ohm + current sense resistor (milli-ohms) + 1 ohm = ~2 ohms.
Configure your meter into DC volts mode -> connect the battery and also the power adapter.
Carefully, measure the voltage to ground of the following signals:
PBAT_CHARGER_SMBDAT
PBAT_CHARGER_SMBCLK
We are checking if either of the above lines is shunted to ground from a defective TVS ESD diode.
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PQ4/PQ9-voltage on pin 1/4/8?
PU2,pin3 voltage?Comment
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PQ4 is 19 for both 1and 8 pin4 is 1.7v
and pq9 is 19 and gate is 9.vComment
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all gives me 3.3 voltsThese are good measurements. The total path of the battery charge resistors = 1 ohm + current sense resistor (milli-ohms) + 1 ohm = ~2 ohms.
Configure your meter into DC volts mode -> connect the battery and also the power adapter.
Carefully, measure the voltage to ground of the following signals:
PBAT_CHARGER_SMBDAT
PBAT_CHARGER_SMBCLK
We are checking if either of the above lines is shunted to ground from a defective TVS ESD diode.
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PU2 voltage is ok. This component is a high voltage (input) LDO regulator (capable of accepting the power adapter voltage directly for input) and with a fixed 3v3 output rail. All good here.
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Please is there anything else that is not making it chargeComment
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Remove all power -> meter in lowest resistance mode. Measure the resistance from the battery connector PBATT1 pins 1-2-3 to the mosfet pins on PQ906. This is to confirm that the EMI filter beads @ PL1 and PL2 are not open circuit.
With the power adapter and battery connected, meter in DC volts mode (20v or higher scale if manual type of meter) - carefully measure the voltage to ground on each leg of mosfet PQ906.
Post each measurement.Comment
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hi thank all you for the support you gave me. I was able to fix the problem. the solution was PQ 906. that was fault. after changing it, it works wellComment
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Awesome! Thanks for the update.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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