Question about JBL Car Audio & Video
SOURCE: my amplifier is flashing back
try disconnecting the speakers, if it still goes into protect, it has fried it's power transistors. If not, try connecting one speaker at a time, untill it starts clipping again, remove the last (problem) speaker connected and remove another one to connect the problem speaker. If it still clips, try connecting it with another set of cables, if it still clips, the speaker is gone. If not, replace the wires of that speakers position in the car. Can you give the specs of the amp and how many speakers you have connected?
Posted on Dec 13, 2010
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It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers.Now that you have found the damaged components you can change them.
These items can be pruchased from any electronic spares parts shop.
After the job is done before you power please check the following:
Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.
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