Assuming that the rectifiers are soldered in, what is the DC voltage measured across the center legs of the rectifiers with R26 and R27 in the circuit?
With the FETs in the circuit (and the PS drive shut down, as you said it was), post the DC voltage on all terminals of the SG3526. Copy and paste the following list and fill in the blanks.
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
Pin 17:
Pin 18:
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
Pin 17:
Pin 18:
Pin 1: 4.98
Pin 2: 1.8
Pin 3: 4.17
Pin 4: 4.72
Pin 5: 4.98
Pin 6: 0
Pin 7: 0
Pin 8: 0.156
Pin 9: 3.57
Pin 10: 2.133
Pin 11: 0
Pin 12: 5.0
Pin 13: 0.062
Pin 14: 8.11
Pin 15: 0.03
Pin 16: 0.066
Pin 17: 8.11
Pin 18 4.98
I mention that the voltage is being limited to 8.9v since if I increase it it will damage the lm6172, greetings.
Pin 2: 1.8
Pin 3: 4.17
Pin 4: 4.72
Pin 5: 4.98
Pin 6: 0
Pin 7: 0
Pin 8: 0.156
Pin 9: 3.57
Pin 10: 2.133
Pin 11: 0
Pin 12: 5.0
Pin 13: 0.062
Pin 14: 8.11
Pin 15: 0.03
Pin 16: 0.066
Pin 17: 8.11
Pin 18 4.98
I mention that the voltage is being limited to 8.9v since if I increase it it will damage the lm6172, greetings.
Increase the 12v supply voltage while watching that voltage. Does it ever go above about 13v?
The regulated voltage should give you about 12v (as it is) but the ICs can withstand ±15v (30v across 4 and 8). Check the datasheet.
If something is damaging the IC it's not likely voltage if you don't see anything much over 12v.
The regulated voltage should give you about 12v (as it is) but the ICs can withstand ±15v (30v across 4 and 8). Check the datasheet.
If something is damaging the IC it's not likely voltage if you don't see anything much over 12v.
I didn't let them get damaged, but they try to stop working, leave the oscilloscope connected to watch the behavior
Connect a jumper across C48 in the power supply. How does the signal/voltage change on the input of those two ICs.