Hello colleagues, this laptop has arrived with motherboard x540sa rev 2.1; The symptom is that it turns on but does not give video.
Add that the cpu heats up but the fan never comes on (verified that the fan works), I have reprogrammed bios with the latest version of the official website and another 2 that I found in this forum with the same black screen result bone no it does not even turn on the display.
I have doubts if the problem is in the integrated CPU and I would not like to make a reflow without making sure.
Say that when I connect the jack to the board it turns on only that the 2 LEDs that have the current one remain on steady and the battery one flashes constantly.
Connected to the laboratory source gives me an amperage of 0.25A.
I have checked the large coils and I do not find short but if I see something strange and it is that on the one hand it measures me one thing and on the other hand it measures me differently and continuously modifying
For example, one side measures me 1.09 and on the other 4.20 and changing to 4.34.4.40.4.50.4.60.
I measured on a 200 ohm scale and I am good about 108 on the other infinity coils.
I put the schematic that has cost me to find it, to see if you can give me a cable.
https://1drv.ms/b/s!ArCMHaOjRKmJ0XPf...Nj14b?e=UFmr6t
Add that the cpu heats up but the fan never comes on (verified that the fan works), I have reprogrammed bios with the latest version of the official website and another 2 that I found in this forum with the same black screen result bone no it does not even turn on the display.
I have doubts if the problem is in the integrated CPU and I would not like to make a reflow without making sure.
Say that when I connect the jack to the board it turns on only that the 2 LEDs that have the current one remain on steady and the battery one flashes constantly.
Connected to the laboratory source gives me an amperage of 0.25A.
I have checked the large coils and I do not find short but if I see something strange and it is that on the one hand it measures me one thing and on the other hand it measures me differently and continuously modifying
For example, one side measures me 1.09 and on the other 4.20 and changing to 4.34.4.40.4.50.4.60.
I measured on a 200 ohm scale and I am good about 108 on the other infinity coils.
I put the schematic that has cost me to find it, to see if you can give me a cable.
https://1drv.ms/b/s!ArCMHaOjRKmJ0XPf...Nj14b?e=UFmr6t
Comment