Lenovo ideapad 5 windows 11 update disable charging circuit?

[m1ch43lzm]

bogart219 What SMDFlea meant, is 1) the firmware is stored on another chip already installed on the board

This is the case for the NM-E211 Board (Thinkpad E14/E15 gen 4) SMDFlea mentioned where there's indeed a 24c256 EEPROM onboard with the firmware, or "configuration bundle" as TI calls it

9.1 Application Information
The TPS65994AE firmware implements a host interface over I2C to allow for the configuration and control of all device options.Initial device configuration is configured through a configuration bundle loaded on to the device during boot.The bundle may be loaded through the I2C_EC port or it may be loaded over I2C3m from an external EEPROM.The TPS65994AE configuration bundle and host interface allow the device to be customized for each specific application. The configuration bundle can be generated through the Application Customization Tool.

But in your board NM-E401 i don't see such EEPROM on the schematics/board view, so according to the datasheet, the EC supplies the "configuration bundle"
Maybe Lenovo did something differently

2), 3), 4) No need to do anything about it, it should work, according to TPS65994 datasheet and the schematics for your board

[bogart219]

bogart219 What SMDFlea meant, is 1) the firmware is stored on another chip already installed on the board

This is the case for the NM-E211 Board (Thinkpad E14/E15 gen 4) SMDFlea mentioned where there's indeed a 24c256 EEPROM onboard with the firmware, or "configuration bundle" as TI calls it


But in your board NM-E401 i don't see such EEPROM on the schematics/board view, so according to the datasheet, the EC supplies the "configuration bundle"
Maybe Lenovo did something differently

2), 3), 4) No need to do anything about it, it should work, according to TPS65994 datasheet and the schematics for your board

Thanks for explaining that to me.
Great, we can proceed then. I replaced the TPS chip, put the two mosfets back on and put the two inductors back on. I'm back to 5 volts and no amps on the usb tester. Will put the PC8309 back, hook the battery back on, and see what happens. The cap that was glowing I will leave off. will let you know.

[bogart219]

Well I'm back to where I started. Put that PC8309 cap back on and still got 5 volts and no amp draw. I put everything back together. hooking up the battery. connected all the cables and everything thinking the computer might need to sense something. Didn't make a difference. It wouldn't even turn on with the battery hooked up now. I measured 12 volts on the battery. I must of fuxed something up real good, probably with my soldering. I don't know what to do now. If anyone has any suggestions. I'm all ears.

[bogart219]

You know one thing I don't understand is the fact that I never remember seeing 20 volts anywhere. Mc1 you " The issue you have is that it's not negotiating 20v with the AC adapter / not charging". To me. I'm taking this as when certain conditions are met, the board is sending a signal to the power adapter to let 20 volts flow. Is this a right assumption? seems to me that if you plug in that power adapter to the USB-C port, that you should have all the voltages on the outlet of that port. When watching a bunch of Sorin;s repair videos it always seems even though a lot of his repairs are no charging problems (sort of like mine), he alwyas seems to read 19 volts on a power rail and then tracks down from there. Never seen 19 or 20 volts. Do you see what I mean? Thank you for your time.

[m1ch43lzm]

Let's start troubleshooting the basics
Get a copy of FlexBV Free if you haven't already, use this software to open the boardview
https://pldaniels.com/flexbv5/

Unplug all power, measure resistance to GND on all power rails, post the values here



+3VL at RE4501, PR6219 or if not present/replaced with a trace, then across PC6205, near PU6219
+3VALW at PJ6201
+5VL at PC6204 (one side is GND, the other is +5VL)
+5VALW at PJ6206
+3VALW_PCH at J2
+1.8VALW at PJ7912

+3VS at J5
+5VS at J4

EDIT: Review US301, it's near PC5302 which you removed, hopefully you didn't damage it

[bogart219]

Hey M1, first off I'm not even sure I know where all the power rails are. I'm going to study on this and get back to you. I did get flexBV free , thanks

This is with the power off.

those vl's below the chart, are also with the power off, measuring to ground correct

[m1ch43lzm]

Hey M1, first off I'm not even sure I know where all the power rails are. I'm going to study on this and get back to you. I did get flexBV free , thanks

This is with the power off.

those vl's below the chart, are also with the power off, measuring to ground correct

I marked the locations of the power rails below the chart, all resistance measurements with power off, battery and charger disconnected, and RTC battery/coin cell disconnected (i think it gets connected to the USB daughterboard), that's what i meant by "unplug all power"
In flexbv, press Ctrl-F, then type PJ6201 for example)

The chart is for reference which voltages should be present, do not apply power yet until after checking resistance values

[bogart219]

Alrighty then, lets get back to business. I was just about to post my findings yesterday when the site went down.

Question Mic, how can you tell where or what the power rails are? This does along with the question I posed in post 104.

Here are my findings: Thanks

[m1ch43lzm]

Looks fine to me
With only battery connected, before pressing power button you should have
+3VL
+5VL
+3VALW
+5VALW

You can measure those voltages, on the caps I listed, the board view shows which side is + (no need to measure voltage from GND to GND 😀, of course the side of the cap you measured 0.1ohms to GND is GND)

That's S5 state (power off)
S0 is power on, After pressing power button you get all voltages
S0Ix is the "modern standby" state after power on, when you close the lid/after some time when the laptop sleeps

Is the power button located on the keyboard? You can also power on the board with the "Novo" button, it's on the USB daughterboard, looks like this behind a pinhole, you can gently press it with a paperclip, or sim eject tool

[bogart219]

Looks fine to me
With only battery connected, before pressing power button you should have
+3VL
+5VL
+3VALW
+5VALW

You can measure those voltages, on the caps I listed, the board view shows which side is + (no need to measure voltage from GND to GND 😀, of course the side of the cap you measured 0.1ohms to GND is GND)

That's S5 state (power off)
S0 is power on, After pressing power button you get all voltages
S0Ix is the "modern standby" state after power on, when you close the lid/after some time when the laptop sleeps

Is the power button located on the keyboard? You can also power on the board with the "Novo" button, it's on the USB daughterboard, looks like this behind a pinhole, you can gently press it with a paperclip, or sim eject tool

With just the battery hooked up, I get 3.2 volts on PC6205 and 5 volts on PC6204. do you want me now to put the MB back in the lappy and hit the novo button? Don't hook up the adapter yet?
I'm confused on what your talking about with the S5,S0 & S0lx states, not sure what you want me to do next.

When we started troubleshooting this MB, I was getting 20 volts with the battery and charger hooked up, now I just get 5 volts. What do you Think happened?

[m1ch43lzm]

It's fine, you can remove the daughterboard from the chassis to test
Connect the daughterboard, battery, and try powering on with the Novo button, it should power on (fan spin)

The S5, S0 are the power states
S5 means "power off", S0 is "power on" that's what the chart means, on each power state there's the expected voltages

So when the laptop is powered off, it's in S5 state
When it's powered on, it's in S0 state

[bogart219]

It's fine, you can remove the daughterboard from the chassis to test
Connect the daughterboard, battery, and try powering on with the Novo button, it should power on (fan spin)

The S5, S0 are the power states
S5 means "power off", S0 is "power on" that's what the chart means, on each power state there's the expected voltages

So when the laptop is powered off, it's in S5 state
When it's powered on, it's in S0 state

Thanks for the info. I'll get that daughterboard off and get back with you. Thanks!

[bogart219]

It's fine, you can remove the daughterboard from the chassis to test
Connect the daughterboard, battery, and try powering on with the Novo button, it should power on (fan spin)

The S5, S0 are the power states
S5 means "power off", S0 is "power on" that's what the chart means, on each power state there's the expected voltages

So when the laptop is powered off, it's in S5 state
When it's powered on, it's in S0 state

Nothing happened. with or without the charger. Could you or someone please answer the question i asked in post 104, I'm trying to understand this better. please

[m1ch43lzm]

When watching a bunch of Sorin;s repair videos it always seems even though a lot of his repairs are no charging problems (sort of like mine), he alwyas seems to read 19 volts on a power rail and then tracks down from there. Never seen 19 or 20 volts. Do you see what I mean? Thank you for your time.

It only applies to laptops with regular DC input jack. you feed them 19v then it goes through 2 mosfets controlled by the charger IC
Or if it has a USB-C charger, then the USB-C PD controller managed to negotiate the 20V with the AC adapter

You have an extra step, that is the USB-C PD controller which negotiates the 20v, then that goes to the input of the charger IC

But it's strange that now your laptop doesn't react to the power button
With the charger plugged in you should get the voltages listed in "S5/S4 AC only"

With the daughterboard plugged in do you get 3VL, 3VALW, 5VL, 5VALW?

[bogart219]

It only applies to laptops with regular DC input jack. you feed them 19v then it goes through 2 mosfets controlled by the charger IC
Or if it has a USB-C charger, then the USB-C PD controller managed to negotiate the 20V with the AC adapter

You have an extra step, that is the USB-C PD controller which negotiates the 20v, then that goes to the input of the charger IC

But it's strange that now your laptop doesn't react to the power button
With the charger plugged in you should get the voltages listed in "S5/S4 AC only"

With the daughterboard plugged in do you get 3VL, 3VALW, 5VL, 5VALW?

Hello. OK, thanks for the explanation. so going by what you said, the " PD controller which negotiates the 20v" means I wouldn't see 20 volts anywhere until the PD controller tells the charger that " the right conditions have been met, its ok to provide 20 V now to the MB ". Is this correct?

" With the charger plugged in you should get the voltages listed in "S5/S4 AC only" = I don't get any of these voltages (3VL, 3VALW, 5VL, 5VALW) (just the charger plugged in and the daughterboard ).

[m1ch43lzm]

Hello. OK, thanks for the explanation. so going by what you said, the " PD controller which negotiates the 20v" means I wouldn't see 20 volts anywhere until the PD controller tells the charger that " the right conditions have been met, its ok to provide 20 V now to the MB ". Is this correct?

Yes, charger when unplugged outputs nothing (0v); when plugged to something it starts at 5v, so it's safe to plug in to a device which expects only 5v (a phone or something else), after that the PD controller negotiates the 20v

" With the charger plugged in you should get the voltages listed in "S5/S4 AC only" = I don't get any of these voltages (3VL, 3VALW, 5VL, 5VALW) (just the charger plugged in and the daughterboard ).

With only the battery+daughterboard you get those voltages?

------
At that point you should even get 5v on PL8301-PL8302 with only charger plugged in, if nothing gets there, the MOSFETs are not turning on
With charger plugged in, measure VCC3_LDO_PD1, you can check at the left side of RPU203, should be 3.3v


At the D of PQ8302-PQ8303, or the D of PQ8304-PQ8301 depending on which port you connect the charger, you should get 5v, or 20v when everything works properly

At this point the 5v only reach the S of PQ8302, or S of PQ8304, again depending on which port you connect the charger, that's straight from the USB-C ports

[bogart219]

Yes, charger when unplugged outputs nothing (0v); when plugged to something it starts at 5v, so it's safe to plug in to a device which expects only 5v (a phone or something else), after that the PD controller negotiates the 20v


With only the battery+daughterboard you get those voltages?

------
At that point you should even get 5v on PL8301-PL8302 with only charger plugged in, if nothing gets there, the MOSFETs are not turning on
With charger plugged in, measure VCC3_LDO_PD1, you can check at the left side of RPU203, should be 3.3v


At the D of PQ8302-PQ8303, or the D of PQ8304-PQ8301 depending on which port you connect the charger, you should get 5v, or 20v when everything works properly

At this point the 5v only reach the S of PQ8302, or S of PQ8304, again depending on which port you connect the charger, that's straight from the USB-C ports

I've been messing with this all day. In attempting to straighten out those two mosfets I replaced, I fuxed them up worse. when and If I get this shit straightened out, I'll get back to you. (disgusted and depressed about my fuxed up smd ability.

[bogart219]

Update: Right now when I plug in the usb tester with the charger it just flashes. Yesterday the usb tester wash flashing when plug in. I removed mosfet Pq8303 completely and the flashing stopped, went back to 5 volts again. OK, I thought i didn't have pq8303 done right, so I thought while I'm at it,I'll straighten out Pq8301 and the TPS (UU201) chip that I replaced. After putting the mosfets back down and straightening the TPS chip, I plugged the ubs tester back in and the dam thing was flashing, *uck. This morning I took back out both mosfets again and cap pc8309... tseter still flashing.
I used my thermal camera and didn't see anything hot standing out. I'm lost at this point. Any suggestions or guidance would be greatly appreciated.

PS: I know this is all my fault but I'm learning alot. All the equipment I bought in the last month or two to take this repair on, I could of bought another new laptop. However, the knowledge I'm gaining plus the interaction with you guys is priceless!

[bogart219]

Good morning. I'm trying to figure out why when I plug in my charger with the USB-C it just flashes (both usb-c ports). I'm thinking I have a short somewhere. At this point,I'm not sure where to start. I did find one of these fuses blown, I beleive but I don't think that would cause the tester to flash.
How should I proceed from here?

[m1ch43lzm]

A fuse should read 0 ohms, so both fuses got blown if you're measuring resistance across them
Measure resistance to GND after the fuses, if not shorted (tens of K upwards) then the fuses may have gotten damaged due to heat

The flashing on the USB-C tester may indicate a fault with the TPS65994 or related circuit, sometimes ICs can get damaged when heat is applied for long time

You can start by measuring resistance to GND on the power pins of TPS65994, VIN_3V3_PD1 at CU207, VCC3_LDO_PD1 at CU209, or at the left side of RPU203, VCC1V5_LDO_PD at CU208, and 5VALW

mon2 what do you think?