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...
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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 warm
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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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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...
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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!!!!)...
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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
...
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Short update:
I got managed to desolder, flash and solder it back onto the board.
I think it doesn't look to bad for my first time.
But unfortunately the laptop is now completely dead. Maybe I somehow shortened or damaged something while working on it, but I will check this out.
Attached picture is the back soldered chip
Thanks a lot for your advices!!!1 Photo
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Thanks a lot!!!!
I flashed the chip with your file and soldered it back onto the board.
But now the laptop seems completely dead. Only the LED lights up in red as long as I press the power button.
No charging and no reaction.
Maybe I shorted/damaged something while soldering (I will check this tomorrow)
P.S: I am a she and not a he
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Vesko356[USER="257490"]Vesko356[/USER] The Laptop was gifted to me. So I had no proof of ownership and unfortunately no longer contact to the gifter.
Do you think I can try to contact the support despite it?
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Yes, I also suspected that my BIOS file is much too large.
But it is exactly what I read out of the chip using the programmer.
So is this maybe a mistake of my programmer or is something really wrong with my BIOS? ...
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Nope, no image on external monitor. Capslock on internal keyboard lights up permanently. External Keyboard is not recognized.
I already tried flashing BIOS with a bootable USB-Stick (solution from Dell support page) and NVRAM-Reset. But nothing works...
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Latitude 7420 - BIOS repair possible?
Hi,
I finally got managed to desolder my BIOS-Chip and create a dump.
My Latitude 7420 won't post, but keyboard-backlight and fans are on.
Mainboard: GDC31 LA-K371P Rev:3.0(A02)
BIOS-Chip: Winbond w25r256jv
Service-Tag: 9SWP2J3
Can you please have a look at it and maybe fix it?...
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Nooo, I think I made it worse... To prepare for hot air desoldering, I measured the BIOS chip and I probably managed to create a short circuit somewhere.
Now I only have a red light as long as I keep the power button pressed. The light fades the longer I hold down the power button. And I hear a beeping sound on the board as soon as the power supply is connected.
To be honest, the schematics are so overwhelming that I don't even know where to start looking.
I do have experience with repairing circuit boards, but this is limited to older devices such as Atari, Commodore...
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First time hot air (de)soldering
Hello everyone,
I am trying to save my broken laptop and would like to desolder the WSON8 BIOS chip in order to repair the BIOS with a programmer.
I have now purchased a hot air soldering station (YIHUA 959D-II) for this purpose. I have already practiced a little on a broken board and desoldered components with it.
(350C with medium airflow and within a few seconds I was able to lift off the components with tweezers)
Now I'm afraid of destroying the BIOS chip if I desolder it too hot or for too long.
Do you have any tips on which nozzle size, temperature...
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Thank you for clarification. At first sight it looks like it has tiny legs. But google gave me the answer: they're not.
So maybe then it is time to learn a new skill
I'll go and get a hot air station and practice a little.
Afterwards I'll post the results with this wson chip here
(And I really hope it is only a broken BIOS)...
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