Good news:
i replaced qv22 and qv23 with help of my other defective board and touchscreen is finally working!!!!
Mirenia
Member
Last Activity: 03-31-2025, 07:35 PM
Joined: 01-31-2024
Location: Freital
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Maybe I found the culprit(s)...
QV22 seems to have emitted magical smoke. QV23 also looks like it has a burned bump.
In schematics they're responsible for Touchscreen power.
Does anyone know, what TS_5v_Det could means?
Detection if it is a 5V Touchscreen or a 5V rail, which detects if a touchscreen is connected?...Leave a comment:
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I would assume the same. My guess is that somehow on the motherboard the touchscreen signal is "scrambled"/malformed.
But maybe I need a little guidance from the experts here where to start troubleshooting/diagnosing.
(As I said earlier: Screen lid component and cables are replaced 2 times)
The mainboard has multiple connectors for everything in the screen lid. A "normal" display connector, a touch connector and two more for IR, camera, microphone and gyro stuff. As far as I could read from schematics: there are a few touchscreen related pins...Leave a comment:
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I'm on Win11. Tried nearly all relevant drivers on dell support page for the old servive ID and the new one.
Tried with the original Win10 image from dell as well.
Do you think, that it is really only a driver related issue?
Wouldn't the touchscreen work in BIOS without having the correct win driver installed?
The hardware ID of the faulty i2c hid device is strange, too:
ACPI\VEN_CUST&DEV_0000
I expected there some specific ID.
I tried to contact dell via whatsapp support. But never got the chance to write to a human...Leave a comment:
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I already tried to disable and enable it (multiple times) in device manager.
And tried to untick all power management checkboxes for every single device.
But you remind me of something unusual there:
The power management settings of the i2c host controller (which the touchscreen is connected to) resets with every reboot. So I have to untick the checkbox for power saving there every time....Leave a comment:
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Dell Latitude 7420 - Touchscreen not working since Mainboard replacement
Hi everyone,
I've got a little "problem child": my [B]Dell Latitude 7420 2-in-1[/B], which had a faulty mainboard.
I replaced it, but ever since, the touchscreen no longer works — and honestly, I’m running out of ideas…
In Windows Device Manager, I just see an I2C HID Device with error code 10. Sporadically, the touchscreen is recognized correctly for just a few seconds, but I haven’t been able to determine under which circumstances this happens.
The touchscreen also doesn’t work in UEFI/BIOS, although it’s... -
Hi subzerillo,
I am using a EZP2019+ programmer with the EZP2019+ Software.
It works in most cases without problems.
You can add chips to the software database or modify some parameters.
[B]But:[/B] This programmer only works with the EZP software. So no alternative tools like NEOProgrammer or AsProgrammer.Hi subzerillo,
I am using a EZP2019+ programmer with the EZP2019+ Software.
It works in most cases without problems.
You can add chips to the software database or modify some parameters.
[B]But:[/B] This programmer only...Leave a comment:
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The issue was not only CMOS battery.
Had to do a reflow of CPU and GPU.
Now everything is working without problems...Leave a comment:
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I think I found the culprid.
CMOS battery drops voltage. After a night without power and main battery it only has 0.2V out of 3V left.
I'll change it and hopefully the reboots are gone then
Leave a comment:
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Acer Helios 500 (PH517-51) - unexpected reboots when laptop is warm (cold solder joint issue?)
Hi everyone,
got an Acer Helios 500 Laptop (PH517-51) for diagnosing with a strange issue:
The laptop runs for a while (1-2 hours, sometimes less) and then suddenly shuts completely off, like someone pulled the power cord and restarts immediately after on its own.
If this happened once, then the laptop only runs for a few minutes until restart.
This happens regardless while staying in windows or uefi or in a linux environment.
At first I thought of a normal overheating issue, but as I monitored temps with HWInfo64, nothing seems very hot.
... -
Thanks a lot!!!!
I just wanted to try this version, but unfortunately while desoldering one leg is broken off of one chip...
Now I have to order a replacement (as a private person this seems really difficult... I don't want to order 2000 pieces at once
)
As soon as I got the new chip, I'll try it again...Leave a comment:
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I tried flashing both.
Unfortunately the issue persists. Maybe it's not a BIOS issue, but a faulty component on the board...Leave a comment:
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Thanks a lot!
But unfortunately the error persists... only charging led and power led lights up.
No fans, nothing. Testet with and without main battery and with and without cmos battery.
But I feel that the heatsinks and the area where the battery is plugged in on the board are getting warmLeave a comment:
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Here are the pictures...
Leave a comment:
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Oh, I think I forgot the serial number. Sorry!
S/N: PF3YZ65A
Full board name: jy572 jy573 jy673 NM-E241 Rev:1.0Leave a comment:
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Lenovo Legion 5 15IAH7 - NM-E241 Rev 1.0 - BIOS fix needed
Hello everyone,
My Legion 5 15IAH7 won't post. won't boot. No fans, no keyboard backlight.
Online power led and charging led lights up.
My guess is that there is some issue with the BIOS.
It's the NM-E241 Rev 1.0 motherboard.
As I found out there are two BIOS dumps needed for this board.
One 16MB and one 8MB.
I've got both uploaded. Can you maybe check and fix this BIOS files?
Thanks a lot in advantage
...
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After another research, it seems to be 2 BIOS chips for this Laptop model.
One contains a 16MB BIOS and the other one a 8MB file.
I think the chip for 16MB is Winson W25Q128JVSIN (UB3) and the chip for 8MB is the GigaDevice 25R64ESIG neraby.
Did I get it right?Leave a comment:
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Lenovo Legion 5 15IAH7 - location of BIOS chip
Hi everyone,
I've got a Lenovo Legion 5 15IAH7 with no post/no boot issue.
The mainboard is a NM-E241 Rev 1.0
Now I am searching for the BIOS chip so I can reflash it.
But I have some difficulties to identify the correct chip. The schemantics somehow are not really helpful for me (I am a beginner with Laptop schemantics)
I found 3 Winson chips and one GigaDevice chip as you can see on the screenshots.
My guess its the W25Q128JVSIN (UB3) because it is the biggest from all.
I attached the pages of the schemantics from the... -
Thanks a lot!!!!
I flashed it with your version, soldered it back and the laptop is finally working again
(You won't believe how happy that made me!!!!)...Leave a comment:
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Hello everyone,
A good friend brought me his almost dead laptop for a repair attempt.
Apart from the keyboard light and the fans, the laptop no longer does anything. No post, no boot.
The integrated screen test still works perfectly. The M-BIST shows no errors and my BIOS flash attempt via USB stick was unfortunately unsuccessful.
I have now desoldered the chip and read it out. My guess is that perhaps the BIOS itself is faulty.
Dell Inspiron 7590
Service tag: 7XZ0HX2
Board: NBL_N15_MB Rev: A00
BIOS chip: EN25QH128A
...Leave a comment:
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