HELP! I think my jl amp is blown.

[Bumpin 86 Caddy]

The irfz44v ones read over 200

 

[Perry Babin]

It's strange that all read OL but it's good that none read as shorted. If you touch your probes together, does the meter read near 0 ohms?

 

[Bumpin 86 Caddy]

Yes. It reads 00.0 when I touch both probes together

 

[nigelwright7557]

Ok. Should the transistors. Be glued to the heatsink.

The gunge on the transistors is heatsink thermal grease, it is not glue.

 

[Bumpin 86 Caddy]

The gunge on the transistors is heatsink thermal grease, it is not glue.

Should I replace that. Or will it being clamped down be
Enough

 

[nigelwright7557]

Should I replace that. Or will it being clamped down be
Enough

I would replace it, ensure the area is made as clean as possible then apply new grease.

 

[Bumpin 86 Caddy]

Ok. Thank you

 

[Bumpin 86 Caddy]

With a different meter I got 18.0 and 180.00 and 1.513 and 18.00 from the 4 transistors grouped together. Power ones I think

 

[Perry Babin]

You'll need to be more specific. 18.0 what? ohms, k-ohms, M-ohms?

Where was the red probe? Where was the black probe?

 

[Bumpin 86 Caddy]

The first one with black meter on middle prong and red on them right it reads 9.02 m ohms. Number 2 with black probe on left prong red on right 9.02 m ohms. The third one with black on left red on right reads 9.26 m ohms. The last one with black on middle red on right it reads 18.4 k ohms

 

[Perry Babin]

If all read the same, none are shorted.

On the Z44s, what is the resistance from leg 1 to the other 2 legs?

 

[Bumpin 86 Caddy]

How would I measure that. One probe on the first leg then the other probe on each other 2 legs or one probe on the first leg and the other probe touching leg 2&3 at the same time

 

[Perry Babin]

One probe on the first leg then the other probe on each other 2 legs

 

[Bumpin 86 Caddy]

With one probe on the first leg and the other probe on the 3rd leg they read over 200 but with one probe on the first leg and other probe on the middle leg all read 0.00

 

[Bumpin 86 Caddy]

some Pictures

...

 

[Perry Babin]

The power supply FETs are definitely shorted.

 

[Bumpin 86 Caddy]

Ok. So replace the 8 resistors and the 8 transistors, right?

 

[Bumpin 86 Caddy]

The Z44s and the resistors in front of them is what I should replace right?

 

[Perry Babin]

From the information you provided, that may be all that you need to do.

 

[Bumpin 86 Caddy]

Alright. I'll try to replace them and see what happens In a few days