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?
danny34
Member
Last Activity: Today, 06:15 AM
Joined: 07-25-2024
Location: Hamburg
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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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I tried some more here. I replaced the IT8996E with a programmed one.
I have all voltages, so the 3.3V / 5V / 20V / 9V / ...
It also seems to start, it consumes 0.9 amps after starting and continuously.
Unfortunately there is no picture. The +LEDVDD (almost 10V) are there.
Unfortunately the +LCDVDD_CON that comes from U1 is missing.
3.3V arrives at pin 5. Unfortunately there is 0V on the EN pin.
The resistor R3 has 97kohms. No short to GND.
APU_ENVDD_R has direct contact with APU_ENVDD and that comes from the processor.
Is there anything...Leave a comment:
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Ideapad V15 G2 - display shows nothing
Hello folks,
I have a Lenovo Ideapad V15 G2 with a Ryzen processor.
The owner damaged the motherboard with a knife while cleaning the ventilation slots on the bottom.
Pretty strange, but that's how it is.
I patched the 5 traces he cut.
The notebook now starts again, but does not produce any images. Neither via HDMI nor on the display.
But the display turns on, so it has its operating voltage and also 3.3V.
What signals does the display use to get the image? Unfortunately I have no experience with this.
Schematics:... -
The E15 now works, but the next problem arises:
Image output only via HDMI, or the backlight of the display does not receive any voltage. Fuse F1 was blown.
I replaced this with the right one (3A32V) but unfortunately it keeps burning out.
Voltage at C10 (next to F1) with power supply is 9.24V. With 11.4V battery. And with both 12.5V.
Display has on the +LEDVDD pins 1-4 no short circuit to GND (40Mohms) and it also worked on another E15.
If I put a bridge between C10 (bridge the fuse) and a pin from the LCD (1-4), the notebook turns off....Leave a comment:
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The schematic
€: Sorry, Schematic attachment failedLeave a comment:
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The new programmed IT8227E arrived. I soldered it in directly and unfortunately the same problem as before... i.e. short circuit to +3VL and the PU202 gets hot
The old IT8227E had a short circuit between Pin1 & Pin121 when unsoldered. So it was definitely defective.
I now have a suspicion that it's exactly the same again, but I can't unsolder the IT8227E again until Tuesday to check.
Without the IT8227E, there was no short circuit at pin 13 on the PU202 and also not anywhere on the +3VL soldering pads of the IT8227E...
So what could trigger...Leave a comment:
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Thanks for your answer. Actually, I suspected that but hoped it could be something else.
Unfortunately I don't have a thermal camera. What do you mean by IPA?Leave a comment:
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Thinkpad L590 short circuit +3VAWL, +1.05VAWL, +1.8VAWL
Hello folks,
I have a Thinkpad L590, motherboard FL590 NM-B931.
According to the owner, 2 power supplies were connected to the two USB-C ports at the same time...
The battery is charging and the power button lights up when you press it. However, the screen remains dark. An external monitor also didn't work.
In addition, the charging LED next to the USB-C port also lights up orange when no battery is installed... There are 12.1V at the battery connection without a battery.
To find the error I was able to find out that +3VAWL, +1.05VAWL and... -
Thanks.
I have ordered a programmed IT8227E for my board and will report when it arrives and is soldered in.Leave a comment:
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Thank you for your answer.
On suspicion I soldered out the UE1 - IT8227E.
There is no longer a short circuit on pin 13 of the PU202.
When I measure between pin 1 (GND) and pin 121 (+3VL / +3VL_EC) on the unsoldered IT8227E, I have 0 ohms.
So I guess I just found the defective component.Leave a comment:
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Thinkpad E15 Gen2 (GE520) hot PU202
Hello folks,
I have a Thinkpad E15 Gen2 with an AMD processor. NM-C771 motherboard GE520.
The PU202 gets hot. I was able to measure that there is a short circuit to ground at pin 13 (+3VL). All other pins are ok.
I've already taken a few measurements, but can't find the cause of the short circuit. Do you have any ideas?
I have already soldered out the PU202, but there is still a short circuit on the conductor track
Thank you and best regards -
I unsoldered the PU201 and the PC208. Unfortunately the resistance is still 1.9 ohms to ground
I measured all pins on the UE1 that have 3VL. Pin 26 has 0.0 ohms to ground. At all other pins (50,92,114,121,106,127, ...) it is 2 ohms.
Is it correct that the UE1 (IT8996) is defective? In that case I give up because it needs to be programmed.
By the way: 5V LDO has several k-Ohms to groundLeave a comment:
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I don't understand it right now...but... I measure on the PU201 at pin 5 (LDO) against ground 1.9 ohms.
The PU201 also gets hot. I just don't understand why I was able to measure 3V there last time. Shortly before I noticed that the PU201 was getting very hot, I was able to measure 5V on the PJ204, i.e. the missing +5VALW. However, only for a short time, then 0V.
The capacitor PC208 is located at PU201 pin 5
(4.7U_0603_6.3V). Unfortunately i tried to measure the capacitance with my multimeter ... OL appears.
The capacitor only has a resistance of the same 1.9 ohms...Leave a comment:
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I did. But isn't pin 83 of UE1 an input?
I didn't fully understand the connection from EC_ON_5V to +3VL_EC which you can see on the right. Unfortunately I can't find this resistor RE7.
[URL=filedata/fetch?filedataid=347082][ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3329759}[/ATTACH][/URL]...Leave a comment:
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[URL=filedata/fetch?id=3329679&d=1723713033][ATTACH=JSON]{"alt":"Click image for larger version Name:\t1.jpg Views:\t3 Size:\t200.0 KB ID:\t3329679","data-align":"none","data-attachmentid":"3329679","data-size":"medium"}[/ATTACH][/URL]
If I understood correctly, EC_ON2_3V will come from PU1901 pin 16. There is 0V there. That's why I measured VCC of this PU1901 and there is 0V instead of +5VALW. I measured for +5VALW everywhere where this 5V should be present, but it was always 0V. So I continued looking...Leave a comment:
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To see why the PU201 had 0V on the EN1, I traced the conductor path and came across the PR206 (20k). This one is fine. There is also the PQ201 and I measured the following voltages on it:
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"1117.jpg","data-attachmentid":3329601}[/ATTACH]...Leave a comment:
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