ukpicasdo
Member
Last Activity: 03-19-2025, 05:04 AM
Joined: 12-28-2023
Location: New Barnet
-
Never got it fixed. My diagnosis was that kbc UE1 is faulty. Too much hassle to reaplce it so board is being used as donor.... -
Hi
Is anyone able to help me with above problem? Thanks....Leave a comment:
-
Surface Laptop model 1769
SN: 007127472557
Motherboard: M1029273-001
WIndows logo appear for few seconds in the loop and not booting Windows.
Please could you check my bios. Many thanks....Leave a comment:
-
I have read few other posts about missing SUSP# and according to some info if EC is not outputting SUSP# signal EC is faulty? Would that be final diagnose? EC need to be replaced? On the other hand isn't SUSP# coming on only during certain phases of booting sequence? I also saw video on YouTube guy soldering a wire from +5V to EC1 and EC2 and laptop did boot, however I am not sure if that is safe solution because #SUSP signal should not be there permanently?Leave a comment:
-
I got SUSP signal on the various points of the board but no SUSP# on pin 124 of kbc UE1
I will also check as advised resistance to GND for other dc-dc circuits bit ater....Leave a comment:
-
Resistance to GND
pin1-2 (3.7k)
6-7 (14.1k)
8-9 (94k)
13-14 (6.6k)
5 (88k)
Doesn't look like anything is shorted here....Leave a comment:
-
I have checked UX2. 3VS and 5VS not present. Does that mean UX2 is faulty or rather that switch is not being enabled due to lack of signal on EN1 EN2? I also recorded video of actual boot loop on this mb like [url]https://youtube.com/shorts/duwQGyFZxgE?si=UVfwlGCsR2fvRHZu[/url]https://I have checked UX2. 3VS and ...R2fvRHZu[/url]Leave a comment:
-
I found schematics. Attached. Check if you can guide me how to check dc-dc transfer 3v/5v to 3v/5v VS?
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/102754-please-schematic-and-boarview-needed-for-nm-d281-lenovo-legion-5-15arh05h?p=3169416#post3169416[/url]https://I found schematics. Attached...nics-theory/trLeave a comment:
-
Attached results for PU2701 and PR2711 resistor after pressing power button.
Just not sure how to check whether 3/5V ALW rail is switched to 3/5v VS. Can you advise?...Leave a comment:
-
Attached voltage and resistance on each coiI and also boardview for this mobo. When powered on voltage does not change. Looks to me that I got 1.2V missing. RT8231A voltage regulator. What should I do next ?
[B][[COLOR=#8e44ad]MOD EDIT[/COLOR]][/B] [COLOR=#d35400]Link to schematic[/COLOR] - [URL]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/102754-please-schematic-and-boarview-needed-for-nm-d281-lenovo-legion-5-15arh05h[/URL]
[B][COLOR=#16a085]Reminder: rules...Leave a comment:
-
Lenovo Legion 5 15arh05 NM-D281 REV1.0 mobo
State: when power button pressed white power button led lights up for 10sec the off for 8sec and then back on for 10 and that is happening in the loop. When charger connected charging light is on battery is charging. Checked with mmeeter. Done some basic fault finding but no luck. I've reprogrammed bios. No good. I want to start from scratch. Please guide me what to measure first cause I'm lost now. Thanks. -
Sorry for late reply I had to order new programmer as it is 1.8V chip. Unfortunately after programing with new bios same issue. It's charging but not powering on. Once power button pressed laptop goes into the loop with power light coming on for 10sec and off. I will keep looking for hardware issue....Leave a comment:
-
Thanks, looks like both files are 0B? Not able to download.Leave a comment:
-
Hi. I got the same motherboard NM-D281 REV1.0 (2020-06-11)
LENOVO LEGION 5 15ARH05H
SN: PF20BDXZ
Issue is it is not starting, just white light comes on and off every 10 seconds. Battery is charging ok.
I attached bios dump.
Can you please help to check if bios is corrupted ??
Many thanks....Leave a comment:
-
Pleas if you can check another bios dump if there is trace of failed updated or anything that can prevent surface from booting? Thanks so much.
Surface pro 5
Model 1796
Mobo M1007506-015
SN: 054826391553
...Leave a comment:
-
Thanks, same problem after I programmed chip with Clear file, logo for 3 seconds and shuts down. Did you find any problem with original bios file ? If no major problem was in orignal bios it may indicate thi is HW problem :/...Leave a comment:
-
Hi. Did you manage to fix the problem with this new bios file? I am hoping it is fixable. -
Hi. Could you pleas help. Surface shows logo for few seconds and goes black.
Model 1796
Mobo M1007506-5015
SN: 023873573753...Leave a comment:
No activity results to display
Leave a comment: