Mackie SWA1501 Thermal Light On But Still Plays

[frostyfx]

Hello everyone,

I hope someone on here will be able to help guide me in repairing a SWA1501.
I picked one up yesterday and when I got home to test it, at the first power up I got a thump in the speaker and the Power LED and Thermal LED are lit.
I switched the amp off and for a couple of Thumps that faded as the capacitors discharged I'm guessing.
I turned the speaker on again and again for a thump and the two LED's lit. I proceeded to test and see if I would get sound out of the speaker and I did.
Everything seems to be working fine except for the fact the Thermal LED is always lit.
One other thing I noticed which I am not sure if it is a problem or not, The volume on the output to full range is about twice as loud as the volume on the high passed output.

Thank you for any help in advance.

I have read the thread below and did not find any info that would help me out.

http://music-electronics-forum.com/t16267/

[frostyfx]

A little update for everyone.
I was able to track down the fault to T6 on the input board. There was no power being sent to the mute circuits which was muting everything even though the thermal switch was not tripped.