I have a thump th15a...It blew a while ago and frat budget is tight so I thought i would try to fix it.
The Overload (OL) light stays on. I don't get any sound. I replaced a resistor today and that still didn't fix it.
Could someone tell me what the typical culprit could be and some tests to run? I don't know a lot about speaker internals but i'm a handy guy so I should understand what you're saying.
The Overload (OL) light stays on. I don't get any sound. I replaced a resistor today and that still didn't fix it.
Could someone tell me what the typical culprit could be and some tests to run? I don't know a lot about speaker internals but i'm a handy guy so I should understand what you're saying.
it's most likely an output stage failure.
check the speakers first if they're ok (as in the voice coils didn't burn up or aren't open) then look to see if the internal amps are ok (no DC at the speaker terminals)
tell me more about the suspect resistor you replaced and why:?
check the speakers first if they're ok (as in the voice coils didn't burn up or aren't open) then look to see if the internal amps are ok (no DC at the speaker terminals)
tell me more about the suspect resistor you replaced and why:?
well when i took the amp module off i looked for any obvious damage. I found a resistor that had leaked some material (looked burnt and brown) from one end onto the board. i sent a picture to my buddy and he says that it looks fried.
i don't know what sort of resistor would leak anything? are you sure it's not a capacitor?
what value and wattage is this resistor?can you post the pic here?
what value and wattage is this resistor?can you post the pic here?
The newer 15a is class D and unless you are highly skilled with lots of specific knowledge and service information. Leave well alone. You can seriously damage yourself with switch mode power supplies!
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What Jon said.
And a general note. Resistors never burn up on their own, it is always caused by some other failure. SO just replacing a burnt resistor is not likely to fix a unit.
If something is visibly burnt, then that is a problem, but the vast majority of failed electronic components do not look any different from good ones.
And a general note. Resistors never burn up on their own, it is always caused by some other failure. SO just replacing a burnt resistor is not likely to fix a unit.
If something is visibly burnt, then that is a problem, but the vast majority of failed electronic components do not look any different from good ones.
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