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W540 - black screen and turning on for a moment

NBS-Elextrixman

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I welcome all good people in this forum :)


I have a problem with repairing Lenovo motherboards. W540 LKM-1 WS MB 12291
I have 4 pieces of W540 motherboard - they all have the same symptom.

- motherboard is switched on for a moment but the screen is black.
- if the battery is inserted, the plate switches on for a moment but the logo appears on the screen
- Consumption 2A

I was programming different bios, I was cleaning the region
DC and BAT input transistors - good

I do not have a schematic for this model, maybe you have a similar one?

Is it necessary to program the MEC ?? by programming a new bios? Is this connected to each other in the

same way as BIOS and EC?


I am asking for directions what else to check
 
I welcome all good people in this forum :)


I have a problem with repairing Lenovo motherboards. W540 LKM-1 WS MB 12291
I have 4 pieces of W540 motherboard - they all have the same symptom.

- motherboard is switched on for a moment but the screen is black.
- if the battery is inserted, the plate switches on for a moment but the logo appears on the screen
- Consumption 2A

I was programming different bios, I was cleaning the region
DC and BAT input transistors - good

I do not have a schematic for this model, maybe you have a similar one?

Is it necessary to program the MEC ?? by programming a new bios? Is this connected to each other in the

same way as BIOS and EC?


I am asking for directions what else to check
Bq24780?
 

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