hi guys, I have this laptop, work good with battery but when i put power supply don't charge battery and don't power on if battery it's low. Suggestion ? Thanks
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Last edited by magnetepazzo; 01-04-2019, 01:52 PM. -
Re: nm-a681 lenovo b50-50 no power no battery charging
test voltage on PQ301 PQ302 all pins for voltage PU911 pin 1.2.9 Voltage
try this SchematicLast edited by Techtiger; 01-04-2019, 03:26 PM. -
Re: nm-a681 lenovo b50-50 no power no battery charging
hi, thanks for reply, on pq301 in i have 20V on all pin (5 6 7 8 ) and 19.64 on rest ov pins. on pq302 i have 1 2 3 4 pin 19.64V ands 5 6 7 8 -19.50Comment
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Re: nm-a681 lenovo b50-50 no power no battery charging
pu911 -20 pin 1 , -20 pin 2 pin 9 -8.50Comment
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Re: nm-a681 lenovo b50-50 no power no battery charging
Test your switching mosfet PQ302 out of the MOB for me it cannot conduct supply without gate passComment
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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... -
Lenovo Ideapad 320-15IKA
NM-B452
Hi guys. I've used the forum a lot but never asked questions before. I had a Lenovo come in that was shorted on the 20V rail. I fixed that and thought my job was done until I realized it wasn't charging the battery. Here is what I've checked so far
On the BQ24780SRUYR charging ic
VCC 20V
SMBUS lines
SDA 3.3V
SCL 3.3V
Current Sensing lines
ACP/ACN 2.3 ohms
SRP/SRN 21.2 ohms
REGEN line 6V
PHASE .84V with no battery installed(this may be normal)
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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,... -
Hi, Working on a Lenovo X1 Carbon 1st Gen (Type 3444) Laptop. Came in for battery problems. Upon testing the battery, I noticed that one of the cells is bursted & has to be replaced. Ordered a Brand New battery. Now it works on battery but does not charge at all. I see in Windows 10 it shows the charging sign & AC power connected but stuck on 79%. I did a press-in switch reset at the botton of the laptop, but did not help. Checked the Voltage on the chip BQ24760RSBR, all seem to be fine. Battery voltages are ok 14.4v but on the battery coil L24, when AC is plugged in I only get 1.8V. Then... -
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:...
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