Hifonics zeus 2550

[Stetsom23]

hi guys
i hope you guys been well

i have a weird problem with this amplifier hifonics zeus 2550.1d

and im in the edge to explode my head

but first at all

i burn a diode (i think is a zener ) making measurements

but i dont know which value is (photo)

the PROBLEM is
I have 13.5v in the gate in mosfets

i check EVERY diode, resistor, capacitor pwm board (i change the board from another amp working) i do everything!! and i dont find the problem

this zener could be the problem?
which value is this diode?

thank you !

 

[MarioRestucci]

what kind of problem does the amplifier present?
although there are 13.5v on the mosfet gate, does the amplifier turn on?
for many amplifiers is a normal thing, it may mean that the power supply is of an unregulated type.
I think that zener diode is part of the cooling fan circuit.

 

[Perry Babin]

I think the Zener LEDs. Does it go to the LEDs in the heatsink?

If you have 12v on the gates, the driver circuit has failed. The PNP drivers are open and the NPN drivers may be shorted.

 

[Stetsom23]

what kind of problem does the amplifier present?
although there are 13.5v on the mosfet gate, does the amplifier turn on?
for many amplifiers is a normal thing, it may mean that the power supply is of an unregulated type.
I think that zener diode is part of the cooling fan circuit.

hi thanks for answer

is not normal have 13.5v in the gate mosfets they have between 3.5 and 5v when they are working
but even without remote have 13.5v and thats bad

 

[Stetsom23]

I think the Zener LEDs. Does it go to the LEDs in the heatsink?

If you have 12v on the gates, the driver circuit has failed. The PNP drivers are open and the NPN drivers may be shorted.

hi Sir Babin
thanks for answer

like i said
i check EVERYTHING!!

Even without the transistors whom conmute the mosfets have 13.5v and even worst.
without the remote conected have 13.5v

did you have the value of that zener
i think is of the led lights

 

[Perry Babin]

Some amp use a 10v zener there.

Post the DC voltage on all terminals of the power supply driver IC.

 

[Stetsom23]

Some amp use a 10v zener there.

Post the DC voltage on all terminals of the power supply driver IC.

hi again Sir Babin

did you mean in the legs of the board? or the terminals of the 7500d ic?

 

[Perry Babin]

the terminals of the 7500d ic

 

[Stetsom23]

the terminals of the 7500d ic

hi Sir Babin

guess what...
in all terminals have 13.5v

my voltage of my power supply is 13.5v is the same
the weird is with or without the pwm board have the same voltage EVEN with the transistors go to the mosfets

i check EVERYTHING!!

Did you think is a 10v zener the smd diode?

 

[Perry Babin]

You have a broken ground somewhere.