Please help. I am supposed to provide music for a big off-grid Independence Day party but I think I did something uniquely stupid and fried my amp.
I have the 4x100W TK2050 module (AA-AB33182) from PE. It was powered by a 12V SLA and was working beautifully. The problem came when I attempted to add an active XO between the source and the amp. The XO is for cars and also runs on 12V, but I managed to switch the polarity on the power connection. I had:
BAT+ to XO- and XO ground
BAT- to XO+
Seconds after powering on, the XO started smoking. I unplugged everything quickly but it appears it damaged the amplifier through the RCA connections. The board still lights up and the fan turns on, but no sound.
Is there any reasonable fix for this or do you need a PhD in electronics to find all of the damaged components? If not, is there any way to get another board by Friday?
Thank you for the help!!!
I have the 4x100W TK2050 module (AA-AB33182) from PE. It was powered by a 12V SLA and was working beautifully. The problem came when I attempted to add an active XO between the source and the amp. The XO is for cars and also runs on 12V, but I managed to switch the polarity on the power connection. I had:
BAT+ to XO- and XO ground
BAT- to XO+
Seconds after powering on, the XO started smoking. I unplugged everything quickly but it appears it damaged the amplifier through the RCA connections. The board still lights up and the fan turns on, but no sound.
Is there any reasonable fix for this or do you need a PhD in electronics to find all of the damaged components? If not, is there any way to get another board by Friday?
Thank you for the help!!!
No, nothing obvious. There was one absolutely charred 1/2 watt resistor in the XO, but nothing visibly wrong with the amp. Of course, half of the board is covered by the heatsink.
OK - thanks for trying. Any idea what sort of damage this abuse could cause? I'll take the heatsink off tonight and see if anything looks wrong under there.
I ordered a new board and paid almost as much for expedited shipping. Yeehaw.
I ordered a new board and paid almost as much for expedited shipping. Yeehaw.
Just guessing, but I think the inputs are coupled through capacitors so there might not have been much damage there. Unless they are electrolytic caps that do not like reverse polarity.
Perhaps there was just a lot of current flowing through the ground traces and the outer ring of the RCA connectors. Off hand I can't think of any particular failure mode other than frying traces and blowing fuses. But I'm no expert either.
Perhaps there was just a lot of current flowing through the ground traces and the outer ring of the RCA connectors. Off hand I can't think of any particular failure mode other than frying traces and blowing fuses. But I'm no expert either.
Your best bet is probably to just order another amp with the fastest shipping possible. Chances are you've got a blown TC2000 or two.
For all of you on the edge of your seat, the replacement module arrived yesterday afternoon. Three cheers for PE. Thanks for everyone's input.
I now have two of these boards I've ruined in different ways. I was thinking I could cannibalize one to repair the other, but I can't imagine any human could desolder and solder these chips with so many tiny little legs.
I now have two of these boards I've ruined in different ways. I was thinking I could cannibalize one to repair the other, but I can't imagine any human could desolder and solder these chips with so many tiny little legs.
Sounds like you have a ground loop issue. You must isolate everything (all audio paths) when trying to operate from a common D.C. supply..
I fried a few things before I figured it out. Toasted a brand new TV by connecting a simple amp from the headphone jack to power a couple of external speakers! (I was sick!) Isolation transformers are my friend now..
I fried a few things before I figured it out. Toasted a brand new TV by connecting a simple amp from the headphone jack to power a couple of external speakers! (I was sick!) Isolation transformers are my friend now..
OffGridGuy, are you suggesting that I would have fried the amp and crossover even if I hadn't reversed the polarity on the crossover power?
No. After reading your post again, after I posted, I then realized your mishap. My Bad..
I was bring an issue to light that has happened to me. Both of my items were connected properly to the power supply but I soon figured out that ground or shield on audio inputs aren't always at the same potential. When operating 2 items from the same D.C. supply, (Battery) can be a bad situation..
Ground loops can cause many different problems. (Low, distorted audio, clock noise in a digital amp, damage in a floating ground scenario, decreased fidelity to name a few)
This is why I isolate everything. My whole house runs on 12 v.d.c. and I've learned over the years. (Fried a few things too..)
I was bring an issue to light that has happened to me. Both of my items were connected properly to the power supply but I soon figured out that ground or shield on audio inputs aren't always at the same potential. When operating 2 items from the same D.C. supply, (Battery) can be a bad situation..
Ground loops can cause many different problems. (Low, distorted audio, clock noise in a digital amp, damage in a floating ground scenario, decreased fidelity to name a few)
This is why I isolate everything. My whole house runs on 12 v.d.c. and I've learned over the years. (Fried a few things too..)
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