Sunfire TrueSub EQ

 

New member
Username: Frankz2018

Post Number: 1
Registered: Jul-18
Here's my problem;
Nothing but a loud hum when I turn it on.
Nothing else. I've tried it with my inputs (RCA) connected and without, no difference.

I've checked all four fuses with my DVM and all are good.

No obvious burnt components, caps do not appear discolored or deformed.

Any suggestions would be greatly appreciated.
 

Platinum Member
Username: Jan_b_vigne

Dallas, TX

Post Number: 18529
Registered: May-04
.

Ground issue. Could be bad power supply caps or a broken solder joint.
 

New member
Username: Frankz2018

Post Number: 2
Registered: Jul-18
Solder joints looked good, even under 10x magnification. No cracks, lifted components or obvious corrosion.
 

Platinum Member
Username: Jan_b_vigne

Dallas, TX

Post Number: 18530
Registered: May-04
.

If you've ruled out one possibility, you move to the next.
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