I checked the LDO values. In the upper pin marks 1.14v and on the lower pins marks 1.89v (left), 1.14v (center) and 0v (right).[/quote]
Hi and sorry, the values I gave yesterday were wrong. The right values with the old LDO were 1,85v at the input, 0,39v at the out and 0v in GND. The values with the new LDO are the same.
It was inpossible to get the LM1117MPX-3.3. I use a LM1117T-3.3. It is a TO-220 type instead SOT-223 but it´s equivalent. As the TO has 3 pins and a tab I made a bridge from the TO’s tab to the contact were the SOT tab was solded.
Today I unsolded the C19 capacitor and the new LDO. The values measured at the contact board without LDO and capacitor are:
U5 LDO: 5v at the input, 0,39v at the out and 0v GND.
C19 Capacitor: 5v upper pin, 0v lower pin.
I solded the new LDO again and the values are:
U5 LDO: 1,85v IN, 0,75v OUT and 0v GND.
C19 Capacitor: 1,85v upper pin, 0v lower pin.
U7 LDO: 0,74v IN, O,65v OUT and 0v GND
I think there are something that makes the voltage supplied to the LDO be lower than usual.
Thanks a lot.