1 Lenovo X12 gen1 LCD back light fuse location
Hello,
I'm trying to identify where is backlight fuse located on this model motherboard, have schematics (can share them as well) but could not find any broken links or find a dedicated fuse. Anyone has more information? ? Any help would be appreciated
Update (07/03/23)
Hello,
here's what i found so far:
There is continuity between pins, the only thing i can't test is chip U5601
There's a fuse named F2601 which is not blown
Update (07/05/23)
Here is page from PDF , have BRD file as well
Update (07/06/23)
@jayeff here is brd file.
I like your thinking about one part breaking other.. thinking to order new LCD to test as well
01 Lenovo ThinkPad X12 Detachable Gen 1 19835 1 Boardview
Just rename file extension to .brd , i had to change it otherwise i can't upload it here
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@slimchef you could post a good picture of your motherboard so we can see what you see. Hopefully pointing you in the right direction. Also, let us know the number for your exact motherboard. Adicionar imagens a uma pergunta já existente
por oldturkey03
@slimchef,
In the schematic, you need to find the LVDS (or eDP) connector i.e. video cable connection on the motherboard which shows the pinout wiring and check if there's voltage on the pins marked for the backlight power.
If there is power on the appropriate pins then check if there's voltage on the backlight enable lead on the connector, usually marked as BKLT_EN or similar. Usually this voltage is in the range 3V-5V DC
With a lot of laptops there's always power available to the backlights but it is turned on and off in the display itself by a signal voltage on the backlight enable lead.
The backlight enable lead is controlled by the BIOS inasmuch as it can be triggered by a signal from the OS (screen timeout) or from the lid switch (when lid is closed) etc.
por jayeff
@slimchef check the fuse for more then continuity. Check to see of you have power on it. Check your display connector and see if you have the proper backlight voltage. What model is your motherboard so we can check as well. The images of your schematic are not enough to remotrly check the circuitry.
por oldturkey03
@jayeff sorry for long reply time. I tested pin BLK_LIGHT ON and it gets 3,4 V
Also, i forgot to mention - LCD was broke, after replacement, new LCD had no backlight, then motherboard was replaced as well. Still no backlight.
Motherboard is Wistron Hera-1 19835-1 (Project Code: 4PD0LK010001) , Lenovo part# 5B21A13040
por Slim Chef
@slimchef
Just wondering if the original broken LCD caused a problem in the original motherboard which understandably would be unknown to you, and then when you replaced the LCD the original motherboard caused a problem in the new LCD, so when you replaced the motherboard the new LCD had already been broken so to speak.
Bit confusing but I suppose it is a possible sequence of what may have happened.
If you have the motherboard schematic file (and not just the boardview file) you may have to upload it to ifixit as I can't find a free download online.
There are a few sites that may be free but you have to register which I don't want to do.
To upload the file (if you have it) in your question above, do the same as you did for images but just upload the file.
I'm no good at working out a problem using the boardview except to make finding a component easier after I've used the schematic to find out what needs to be checked but with a schematic I may be able to work it out.
por jayeff
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