crap. Resistance between V9B+ and VCCIN (at PL12 and also PL13) are 4ohm. Both highside mosfets (PQ16 and PQ19) have a diode test at 0.0V, no matter in which direction...
Not good news, right?
thanks for your help...
danny34
Member
Last Activity: 01-01-2025, 01:49 PM
Joined: 07-25-2024
Location: Hamburg
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I haven't changed anything, but I no longer have a V9B+. Also 4ohm to ground...
strange
where do the V9B+ come from?
20.7V is still available until after the QB6 and F6101, from there it is called VINT20_IN.Leave a comment:
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the 9V is stable, as are all other voltages such as +3VALW or +5VAWL. It only affects those described above.
I just swapped BIOS chip UB4 from my other working E15 G2 i7 board with the latest BIOS version. Same gameLeave a comment:
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E15 Gen2 Intel i5 - doesnt start & jumping voltage
Hello,
I have an E15 Gen2 with Intel i5 and need your help.
It doesn't start and here's what I've already found out:
All voltages are available.
However, the PU8 (RT3612) does not switch the mosfets for +VCCIN.
On the PU8 I measured 3.3V at pin 23 (VRON), but it drops to 0V every about 3 seconds. This voltage comes from the IT8227E.
VCC from IT8227E has exactly the same symptom. Every 3 seconds the voltage briefly drops to 0V.
In the end I saw that +1.8VALW (VCC from IT8227E), +0.6VS, +2.5V_DDR & +1.2V drop to 0V... -
I now measured the other pins of the BQ:
[TABLE="border: 1, cellpadding: 1, width: 150"]
[TR]
[TD]Pin[/TD]
[TD][COLOR=#cc0000]Defective E15[/COLOR][/TD]
[TD][COLOR=#27ae60]Working E15[/COLOR][/TD]
[/TR]
[TR]
[TD]23[/TD]
[TD]5.3V[/TD]
[TD]9V[/TD]
[/TR]
[TR]
[TD]24[/TD]
[TD]5.5V[/TD]
[TD]14V[/TD]
[/TR]
[TR]
[TD]25[/TD]
[TD]9V[/TD]
[TD]14V[/TD]
[/TR]
[TR]
[TD]26[/TD]...Leave a comment:
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I have an identical motherboard. Fully functional.
I measured both on the BQ25710 and had the following results:
[FONT=Arial][SIZE=16px][B]Working E15:[/B][/SIZE]
[COLOR=#2ecc71]Pin 1 VBUS: 20V
Pin 2 ACN: 20V
Pin 3 ACP: 20V
Pin 4 CHRG_OK: 3.3V
Pin 5 ENZ_OTG: 0V
Pin 6 ILIM_HIZ: 2.2V
Pin 7 VDDA: 6V[/COLOR]
[B][COLOR=#ff0000]Pin 8 IADPT: 0.3V[/COLOR][/B]
[COLOR=#2ecc71]Pin 9 IBAT: 0V[/COLOR]
[B][COLOR=#ff0000]Pin 10 PSYS: 0.3V
Pin 11 PROCHOT#: 1V[/COLOR][/B]
[COLOR=#2ecc71]Pin 12 SDA: 3,3V
Pin 13 SCL:...Leave a comment:
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Thinkpad E15 Gen2 no SUSP# Signal from EC
Hello folks,
following problem on an E15 Gen2 with i5 processor (NM-D011):
Doesn't start
SUSP - high (5.1V)
SUSP# - low (0V)
Pin124 (SUSP#) on the EC resistor to GND is 80kohm.
Does anyone know why the EC doesn't output SUSP#?
What requirements do you need to get a high there?
Thank you!☺
Schematic: [URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/94030-lenovo-thinkpad-e15-gen2-ge4b0-ge5b0... -
Hello folks,
I'm Danny from Germany and I enjoy repairing Lenovo notebooks 😁Leave a comment:
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The picture is gone. I have uploaded it again in the attachment
Does anyone have an idea?...Leave a comment:
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Unfortunately that's not it either.
I uninstalled and reinstalled PD & power supply drivers, and everything that says energy or power.
Unfortunately that didn't help.
Lenovo Vantage says "charging" under battery settings but says "not connected" under power adapter.Leave a comment:
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I soldered in a new UB7 today. Now the gate voltage is at 27.9V and I have 19.9 volts at the output of QB6. Of course that's great.
Unfortunately, the message still comes up when you start... and it loads, but slowly.
And it still doesn't show in the taskbar that it's charging.
any more ideas?
All drivers are up to date and checked again with Lenovo Vantage....Leave a comment:
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QB5 Gate - 20,4V
VCC3_LDO_PD - 3,48V
ADCIN1 - 0,371V
ADCIN2 - 3,48VLeave a comment:
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Pin 1 VBUS - 17,94V
Pin 7 VDDA - 6,08V
Pin 22 VSYS - 9,18V
Pin 28 REGN - 6,07V...Leave a comment:
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Pin 1-3 280kohm.
gate voltage is 20.4V.
Input voltage 19.94V.
Output voltage at pin 1-3 17.91V. I saw in a YouTube video about the E15 Gen2 that the gate voltage should be 28V so that the Mosfet opens fully. The QB6 also gets very warm.
That's why I wanted to change the UB7, but the one from China was probably defective. There was only 5V available from the USB....Leave a comment:
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QB5:
Source - Drain = OL
source - Gate = 0,6M ohm
Gate - Drain = OL
QB6:
S - D = OL
S - G = OL
G - S = OL
CHG_OK at BQ25710 has 3,3V....Leave a comment:
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Thanks for the reply.
The input voltage on the QB5 is 20.3V.
UB7 is the original one.
I can test the mosfets later, unfortunately I'm at work right now.
I updated the BIOS yesterday to version 1.62 (September 3, 2024), as well as all drivers including PD drivers.
Then reset the bios again.
Unfortunately that didn't change anything.
EDIT: What would happen if I just bridged QB5 and QB6?Leave a comment:
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Thinkpad E15 Gen2 Intel "lower wattage AC Adapter"
Hello folks,
My Thinkpad E15 Gen2 with i7 had stopped loading and wouldn't start either. I noticed the typical error with the Mosfet QB6. This has become unsoldered.
I soldered it back on and found that the gate voltage was too low and that's why it was getting hot. Then I wanted to replace the UB7. Unfortunately the one I ordered from China didn't want to run.
So I soldered the old one back in and it still has its 18.9V at the output of QB6.
I stuck a thermal pad on the QB6 to cool it down a bit.
Now the E15 is running again, but unfortunately... -
Lenovo L15 Gen1 NM_C631 VCCSA short to GND
Hello folks,
I have an L15 Gen1 (NM-C631). It has all voltages so far, but not VCCSA.
While searching I discovered the PQ1101 which burned down.
[URL=filedata/fetch?filedataid=358490][ATTACH=JSON]{"data-align":"none","data-size":"small","data-tempid":"temp_358490_1730197398874_474","title":"1000095928.jpg"}[/ATTACH][/URL]
I then soldered out the PQ1101 & PL1102 and the capacitors that come afterwards. Unfortunately there is a short circuit to GND (0.2ohms) on... -
Maybe it helps: The Tab key & Power key lights up at startup.Leave a comment:
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The conductor tracks are apparently all in direct contact with the processor.
I marked the “cut” in the picture redLeave a comment:
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