The LED light comes on and stays on but there is no sound, no hum, no popping, nothing. It was working fine, then just didn't make another sound.
SOURCE: i have 2 th-15a and
Make sure ALL interconnected equipment is powered from the SAME receptacle. Use extension cord if necessaary. Use ONLY balanced interconnecting audio lines as well. You have a ground loop... make sure all power connections are three wire.
SOURCE: TH-15A won't make sound. Comes on, then flashing
I've fixed over 100 of these beasts, hope i can shed light for you all ;-)
The flashing LED indicates the power supply rails (+28v and -28v) are being pulled down to 0volts by a (typical) fault on the amp board, usually means the amplifier chip has faulted (usually the LF amp, but on occasion can also be the HF amp).
Locate the 3wire(red, black, brown) connector that goes between the amp board and the larger power-supply board and disconnect it at the power-supply end. (it's actually hard-wired on the amp board end).
Now switch on the Amp, the LED should now be stable, which has proven you've isolated the fault.
Order a replacement board from Mackie, the part number is on the PCB.
From memory it's something like "002163-00" or something, but now you know what the part number will look like.
Depending what country you're in, Amp boards are around $100.
Enjoy!
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