This board raises all the voltages but soon after fall, only 12, 5 and 1.8V the rest is dropped after a few seconds.
Analyzing the PWM of the Vcore graphic, which would be the next in the start seuqência, I realize that we have only 2.4V stuck in the pin of the EN .
I went to the logic port U505 pin 4 OUT, and it comes out 3.3V correctly, passes through the D504 And gets its 3v but when it arrives at the EN pin of the PWM, it is in 2.4V And I think that may be causing the defect!
I tried to find some resistor in the way and only found the R552 of 0 Ohm, which enters the U501, removed the U501 and still we have 2.4V in EN
I tried to jump after the D504 but the voltage of the EN dropped to 100mV on the line, I did not understand anything more!
Analyzing the PWM of the Vcore graphic, which would be the next in the start seuqência, I realize that we have only 2.4V stuck in the pin of the EN .
I went to the logic port U505 pin 4 OUT, and it comes out 3.3V correctly, passes through the D504 And gets its 3v but when it arrives at the EN pin of the PWM, it is in 2.4V And I think that may be causing the defect!
I tried to find some resistor in the way and only found the R552 of 0 Ohm, which enters the U501, removed the U501 and still we have 2.4V in EN
I tried to jump after the D504 but the voltage of the EN dropped to 100mV on the line, I did not understand anything more!
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