Lenovo ideapad 5 windows 11 update disable charging circuit?

[mon2]

Try some of the ideas here:

https://forums.lenovo.com/t5/Lenovo-...er/m-p/5150879

[bogart219]

Yeah Mom2, I tried those suggestions and nothing worked. I'll just have to keep reading and plugging away and hope I come across someone who maybe had a very similar laptop with the same problem. I do want to thank you for taking the time to trying help me. I see you help many people on this board. Your a real stand up guy! Thanks again! If I ever find the problem I'll be sure to post back here.
Anyone else who has any suggestions, please chime in!

[mon2]

Do you have this aux charge port like this video?

https://www.youtube.com/watch?v=ZhC4...ythingReviewed

[bogart219]

Yeah, I seen that video, I don't have that jack unfortunately .

[bogart219]

Whats weird is with the usb-c tester plugged in with the battery hooked up,the tester says 20 volts, yet I can't find 20 volts anywhere on that motherboard. I can't even find a schematic that I can purchase. Last but not least I have two dead laptop batteries that I'm trying to figure out if there is a way to charge them outside the laptop. Another strange thing is when i hook my usb-c up to the power adapter it doesn't come on until I plug it in to the lappy, is this seem right?

[mon2]

Other websites are linking the 'S570-IAL' schematic to this model. Is your BQ24710 charger with the silk screened PU5301 on the PCB? I do see this schematic in my database (locked to my sub). We should be able to use it to continue the review.

I think we should focus on the mosfets between the PD controller and the charger IC.

Remove all power. Locate the DCin mosfet @ PQ8304.

[mon2]

< continued >

Measure the DCin mosfet using resistance mode. Meter in resistance mode.

Measure:

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. Each should be hundreds of k ohms or higher else could be defective.

Review also the next DCin mosfet @ PQ8301. This pair is for one of the USB-C ports.

The other USB-C port is linked to mosfets @ PQ8302 & PQ8303. Working in the same way. When BOTH mosfets from the port are enabled, the logic board will receive the power adapter voltage. The mosfets are enabled using the gate pin and are this voltage is being driven by the PD controller @ UU201.

Confirm that your board is like the schematic shared above.

[m1ch43lzm]

The issue could be that the PD controller is not switching the MOSFET that goes from the type-c port to the system, as you say that the meter goes to 20v

EDIT: mon2 beat me to the reply, the following may still be informative content
Also measure voltages at those MOSFETs, when charger is plugged in (be very careful, especially when measuring the gate pins, you need a very sharp probe on your multimeter)

In some of Sorin's videos (YT: Electronics Repair School) he noticed that 2 MOSFETs related to the PD controller get hot, to the point of desoldering themselves from the board, he bypasses one of those with a wire "the dodgy way", as he calls it
Not sure if there's a proper fix for that issue, as it's not always a good idea to bridge random components

These 2 videos show the issue/repair
https://youtu.be/55oGJArv2oo?si=XR51fYqLzXcnhan0

In the second video he bypasses only one MOSFET, leaving one usb-c port dedicated for charging only
https://youtu.be/7K6XsZkWzJo?si=Ag-JjHessBcXUVis

May be a similar issue with your laptop, we would need more pictures of the board to try to locate the affected components, try to find the same components as those videos, may be near the TPS65994 IC (if that's the PD controller you have on your board)

Hope someone more experienced with this issue can help

Last but not least I have two dead laptop batteries that I'm trying to figure out if there is a way to charge them outside the laptop.

Do you have a variable bench power supply? You can use it if you set the voltage and current limit according to the battery specs
The current limit you could set to around 1.5amps, voltage to 4.2v per cell
Example: if your battery is 3-cells (label says 10.8-11.1v), set your power supply to 12.6v
For a 2 cell battery (label: around 7.2v-7.4), set to 8.4v
Then hook up your bench PSU to the appropriate + and - terminals of the battery

Another strange thing is when i hook my usb-c up to the power adapter it doesn't come on until I plug it in to the lappy, is this seem right?

It's by design, the usb-c ports remain powered off until you connect something to them
If you connect the usb-c tester to the laptop (powered on, assuming you still have some battery % left), the meter shouldn't power on unless you connect a device to the other end (ex: a phone, a USB-C flash drive, a type-c to regular USB adapter, anything)
If the meter powers on from your laptop without having something plugged in to the other end, then the board is wrongly detecting that something is attached

Same goes for the charger, it should output no voltage until you connect it to a device, then it starts at 5v then negotiates up to 20v, so in theory you can plug your laptop charger to your phone, and the phone would charge normally without blowing up, at least on an original charger
On a fake/counterfeit USB-C charger, anything can happen...

[bogart219]

Mom2, I found PQ8304 with board view but I believe its on the underside of the board, correct? I will have to remove the motherboard from the case right?

[bogart219]

M1CH, I have a bench power supply but the problem is the connector on the battery. Any suggestions on how to connect to this plug? I was trying to find one on line but no luck.

[m1ch43lzm]

bogart219 You can stick 30 AWG solid wire inside the holes on the battery plug, only need to connect the red and black wires, the other 4 wires leave alone
I also couldn't find a matching connector online

Mom2, I found PQ8304 with board view but I believe its on the underside of the board, correct? I will have to remove the motherboard from the case right?

Yes, they're on the otherside of the board, you have to remove the board to check
Lenovo also places warranty stickers on the screws, if your laptop is still under warranty i suggest sending it for repairs, backup your data first
If out of warranty, proceed

I suggest to measure resistance to GND at PL8301, PL8302, that's the charger input after the mosfets PQ8302->PQ8303 or PQ8304->PQ8301
Also measure voltage at that point with charger plugged in (i marked it on the attached picture), you should have 20v there


If there's no voltage, likely the issue is related to PQ8302->PQ8303 not turning on if using the port labeled JUC2 nearest to the hinge, and PQ8304->PQ8301 if using the port JUC1 next to the HDMI port, or the PD controller UU201

Plug in charger to JUC2, then measure gate voltage of PQ8302 (there's a convenient spot at PR8301 closest to PQ8302), should be more than 20v (around 25-26 i guess), if gate voltage is not enough, the MOSFET doesn't close fully


Same with the gate of PQ8303, measure voltage at PC8301/PR8301 (careful not to short the probe to the fuse at the left)

[bogart219]

Morning fellows.

PQ8304
source (1-2-3) & drain (5-6-7-8) = .9ohms
source (1-2-3) & gate (4) = .2 ohms
gate (4) & drain (5-6-7-8)= .9 ohms My board looks like the schematic shared above.

I have watched those videos by Sorin, I like how he talks.
resistance to ground = both at 46 ohms.
0 volts on both of them.
PL8301
PL8302

Gate voltage at PQ8302 = 5.27 volts Don't see PR8301 on my board.
Gate voltage atnPQ8303 = 5.27 volts

Charging those batteries seemed to work by sticking a thin wire into the plug. thanks for that tip.

Pd controller chip is a TPS65994

Now its like that song by Chicago, "Where do we go from here ".

[m1ch43lzm]

It seems PQ8304 is shorted, please do the same resistance measurements (S-D, S-G, G-D) at PQ8301, PQ8302, PQ8303

MOSFET part number is SM3313NSQA, lets find a suitable replacement available on digi-key/mouser

[bogart219]

PQ8301 s to d =.8 s to g = o/l g to d = .2
PQ8304, PQ8302 & PQ8304 all s to d = o/l , g to s =.2, all g to d = o/l o/l = no reading at all.
This is doing a revision and measuring again using my Fluke and reinserting my test leads. I believe this accurate.


Question: With the battery unplugged and the power adapter plugged in, the usb-c tester only shows 5 volts. So are you saying that there is a chip on that board ( the TPS65994?), that is going to send a signal back through that usb-c charging port, back to the power adapter to tell it to send 20 volts through now? I mean this laptop should run with just the charger plugged in by its self correct? Ie, I don't understand why I can't find any 20 volts anywhere, confusing.


On a side note:
Hmm, I was able to charge up the replacement battery I got with my benchtop power supply, at 12.6 volts, it started out pulling 3.5 amps then afte ran hour or so dropped t .2 amps. My original battery that came with the laptop and that I barely ever used, is pulling no current.
starting out mu replacement battery read about 10 volts. the original only reads .2 volts. Not sure how to proceed with that now.

[mon2]

The original battery most likely has locked the BMS module, for safety reasons. Best to replace it.

[bogart219]

The original battery most likely has locked the BMS module, for safety reasons. Best to replace it.

This battery is only a couple yeras old and hardly ever used. What would cause the BMS to lock up? thanks.

[mon2]

When a battery is deeply discharged, a Battery Management System (BMS) may initiate a "lock" or protection mode to prevent further damage. This lock effectively shuts off the battery, and users may need to take specific steps to restore it to normal operation.
Understanding the BMS Lock:

• Protection:
  BMSs are designed to prevent overcharging, over-discharging, and other faults that could damage the battery.
• Deep Discharge:
  When a battery is discharged below a certain voltage threshold, the BMS may trigger a protection mode, essentially "locking" the battery.
• Zero Voltage:
  With lead-acid batteries, you might still have some voltage on the terminals even if damaged, but with a BMS, the battery will shut down and show zero volts.

How to Recover a Battery from BMS Lock:

• Trickle Charger:
  One of the most reliable methods is to use a trickle charger to gradually increase the battery's voltage, says FORM Charge.

[bogart219]

When a battery is deeply discharged, a Battery Management System (BMS) may initiate a "lock" or protection mode to prevent further damage. This lock effectively shuts off the battery, and users may need to take specific steps to restore it to normal operation.
Understanding the BMS Lock:

• Protection:
  BMSs are designed to prevent overcharging, over-discharging, and other faults that could damage the battery.
• Deep Discharge:
  When a battery is discharged below a certain voltage threshold, the BMS may trigger a protection mode, essentially "locking" the battery.
• Zero Voltage:
  With lead-acid batteries, you might still have some voltage on the terminals even if damaged, but with a BMS, the battery will shut down and show zero volts.

How to Recover a Battery from BMS Lock:

• Trickle Charger:
  One of the most reliable methods is to use a trickle charger to gradually increase the battery's voltage, says FORM Charge.

Thanks for the tip!

[bogart219]

It seems PQ8304 is shorted, please do the same resistance measurements (S-D, S-G, G-D) at PQ8301, PQ8302, PQ8303

MOSFET part number is SM3313NSQA, lets find a suitable replacement available on digi-key/mouser

I can't find those mosfets on Mouser or digikey, do you have any other place in mind? Thanks!

[mon2]

AON7318 Alpha & Omega Semiconductor Inc. | Discrete Semiconductor Products | DigiKey
* change the country and currency to suit the USD