Skar Audio T1400.1 protection light flashes fast on/off?

[8LayerJunky]

D20,D21,D22 anf D23. I can't even make out what is on the diode, if I had to guess C001.?? On input side rail, all the fets are only reading on middle leg. Gate-Drain-Source, only getting an actual reading on Drain pin??

 

[Perry Babin]

It's best if you don't refer to anything as 'rails' except for power supply rails. Either the ± rails that feed the output transistors or the low voltage regulated rails that feed the op-amps and such.

Photos save a lot of time and cost nothing.

The hifonics amps that are similar to this one use FR154 diodes to supply voltage to the 12v regulators.

 

[8LayerJunky]

So those Diodes due tend to fail alot? And I will take pics of entire board and circle the fets that are not reading in spec .

 

[Perry Babin]

You can't check much of anything definitively unless you remove it from the circuit.

Those diodes have never failed in any amp that I've had in for repair.

 

[8LayerJunky]

There was a broken resistor. Got it going yesterday, but when I unplugged hot, ground and remote, the ends were hot to the touch? Any ideas? Or you think it's in the power supply??

 

[8LayerJunky]

Oh and it was a bad transistor and diode on the tiny tiny driver board thingy. I had to unmount it to remove bad compents.