Need help with a bad Xenon 200.4

[sunshinefc3s]

Hey guys, got a bad Xenon 200.4. When connected to power, and no input connection (just output), it sends a high pitched noise through the speaker. Two of the little LEDs light up by the power/ground terminals - D8 and D15. D8 lights up first, and then goes out, but D15 stays lit. Plus, as you can see in the pic there is a lot of dust on the board, but its localized just to that section. The rest of the boards is spotless.

Any thoughts or help appreciated. Happy thanksgiving!

[dwnrodeo]

Looks like something was possibly spilled there which is why the dust is localized to that area. Try cleaning with alcohol. Good luck on the repair, that is a great amp.

[trickyricky]

Great amp in deed, I purchase one recently and bench tested it. Put out 957watts total on two 8ohm loads (bridged, two channels which is the same as 4 ch @4ohm not that it matters because the amp puts out rated power from 1-4 ohms stereo).

I agree with rodeo, clean it up first (discharge first) might not fix the issue but at least give you a clean area to start working off of. I would try dusting it off with slight pressured air (make sure its oil-free compressor, or air in a can will work also).

[sunshinefc3s]

I agree with rodeo, clean it up first (discharge first) might not fix the issue but at least give you a clean area to start working off of. I would try dusting it off with slight pressured air (make sure its oil-free compressor, or air in a can will work also).

Thanks guys, ill try to clean it.

What do you mean "discharge"? I'll grab a can of compressed air today. Is regular pharmacy style Isopropyl Alcohol ok?

[trickyricky]

With all those filter caps in the PS section they are bound to hold charge, discharge them by shorting + and ground terminals of the amplifier with either a 10ohm or higher resistor or a lamp bulb.

99% iso is best, don't use anything less than 95%.

[ttocs]

or drag a screwdriver down the back of all the connections a few times

[sunshinefc3s]

OK, I got some denatured alcohol and a can of air. Put a bulb across the terminals, cleaned it up and let it dry. Hooked it up and same noise, same LEDs light up.

Any thoughts of next steps? Thanks!

[trickyricky]

Am not too familiar with these but does the other channels LED's light up?

[sunshinefc3s]

I double checked today. No other LEDs light up
Just those two I mentioned. Any advice on how to proceed?