JL Audio HD750/1 flashing green light

[Jon34]

 

[Jon34]

I was mixed up.

This is where we currently are.
Sorry

 

[Perry Babin]

Were the 2552s on the left shorted?

 

[Jon34]

 

[Perry Babin]

I don't know what those are for, how they were measured or if in or out of the circuit.

 

[Jon34]

In circuit fd2552

 

[Jon34]

The second fet jumped values before becoming open

 

[Perry Babin]

I don't see anything obvious. Why did you initially replace the 2552s?

 

[Jon34]

Because my coworker said they were bad

 

[Perry Babin]

Were they the 2552s that you pulled from the output channel, the ones you posted earlier?

 

[Jon34]

Yes

 

[Perry Babin]

They don't look defective.

Confirm that one of the 2552s (preferably a new replacement but...) reads infinite resistance to the other two terminals. If one reads infinite resistance, install it in place of the negative rectifier you have installed and clamp all FETs to their heatsinks and power up with limited current (no more than 10 amps). Does it power up?

 

[Jon34]

Can you explain that to me in my terms? I'm not that experienced

 

[Perry Babin]

You need to be very specific on what you don't understand.

 

[Jon34]

If I understand...

The 2 and 3 terminals continue to build resistance

 

[Perry Babin]

Are you referring to the FETs in the circuit or to the ones that you showed in the previous post?

Check as is shown below.

 

[Jon34]

On both of these fets.. reads infinite.

you are asking me to replace one of them?

 

[Perry Babin]

I'm asking you t check the FETs that you showed (out of the circuit) earlier. And then install one that's still OK in the place of the negative rectifier.

 

[Jon34]

I see a weak solder point now on the 1st middle leg. Just fyi

 

[Jon34]

I'm asking you t check the FETs that you showed (out of the circuit) earlier. And then install one that's still OK in the place of the negative rectifier.

Does it matter which rectifier i replace?