Noursa
Member
Last Activity: 04-12-2025, 10:50 AM
Joined: 06-01-2023
Location: PARENTIS EN BORN
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fine for me thx dude... -
nobody as an idea ? any tips or advice?
thx again for helping...Leave a comment:
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the backup i upload is original one from the mainboard who doesn't give screen, i think he's corrupted
is search inside this bios the $bid and found 085EA for the bios version so i try with the hp 085EA bios version but no more screen on startup
so i ask here if someone can take a look on the original bios to see if something is wrong or if i must look on hardware issue
Thx for helping...Leave a comment:
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sry the Serial number is CND94408KS model 15-DB1024NF product id 8BR23EA#ABF
Hope nothing is missing now
Thx again for help...Leave a comment:
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Hello got thez same trouble on this laptop
fan spining at full speed no screen even on external port
i try with the hp bios 085EA but same issu
here is the orginal one
thx all
forgot to say that when th elaptop is runing with no screen the caps lock is blinking like 5 long 3 short sequence if that can help, for me that the sign of corrupted bios...Leave a comment:
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HEllo thx for helping
so on eDP_VDD_EN_D pin 4 on U5501 got 3.15v like one second thern back to zero
if i understnad what you said this signal didn't detect the screen then shut down the backlight
so it seams that my screen is dead ?
i do some test with other screen (just the same connector not the same model) but that dosen't work (normally that work's when i do that on other laptop but this one seams to be a bit particular
So do you think i have to order a new screen ? everything seams to be fine on the mainboard ?
...Leave a comment:
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Even if we can't fix it i learn a lot so thx for helping...Leave a comment:
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thx for helping
with MB inside the laptop on lid close on tpad1 got 3.2 onlid open and 0v on lid close on pin 1 (i can't find the R6509 on the MB)
With MB oustide the laptop on Rn 2403 got the 3.3 S5 on pin 1 and 2 on pin 3 KBC_NOVO_BTN# got 3.2v and 0v on pin 4 LID_CLOSE#
i cant' find the HALL1 the hall sensor anywhere on MB or other part of the laptop as well as R6701 and C6701 that make me crazy
If i understand correctly that's mean the captor works and cut the signal for TP when laptop is closed
Thx again i wait for next test...Leave a comment:
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Anyone having any idea to check ?...Leave a comment:
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hello thx for answer i found one schematics here seams to be the good one
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/100421-wistron-lc40-18837-sc[/url]
i flash the bios with a good version i found
after more test i can say few thing
on eDP_VDD_EN_D on U5501 i got nothing where it's seams to be 3.3v normally
so i got nothing on pin 26 27 for BL_EN LCD_BRIGHTNESS ON LCD1 connector
i got nothing too on pin...Leave a comment:
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Lenovo Yoga C940-15IRH No primary Screen
Hello
I'am a beginner in electronics repair and i got some trouble to find what's goning on a computer. It is a lenovo yoga C940-15IRH laptop and the screen doesn't work anymore, but that work on an external one
the screen seams to be hard to unbuild properly so i want to test it by other way
how can i be sure if the signal is really send to the screen ? i did some check on screen connector on LCD1 got 19v and on MiC1 connector on the other side of the screen (dunno if it's for the screen itself or other thing) got a lot of 3.2v pin
did u got...
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