Question about Audio Players & Recorders

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Ihave a HARMAN/KARDON AVR 3550 Audio/Video Receiver. Just yesterday while having it on digital sat reception and just as i was changing the channel a screaching and dying sound occured and immediatly sat reception ended and the AVR 3550 lost showing the Main Information Display onlybut I can't play anything else. I closed everything down but checked my LCD TV SCREEN for local channels and other sat digital reception everything was fine. So now what should I do?

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  • ogloony Apr 22, 2009

    no i don't think that my solution is new firm ware because the sound it gave was to loud indicating somthing blew out inside , i need an expert to guide me thru a series of check list or otherwise to identify the problem specially if he had incountered this problem before?


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The unit is probably faulty, and in that case it must be fixed by a technician or an experienced DIYer.

To start unplug all video and audio cables , unplug power cord from AVR-3550, wait ten minutes and restart with only TV connected on a cable different from the one used when the problem occurred. This can solve minor problems, and will tell you if the problem is a shorted video cable

That won't probably fix the problem.

In that case the receiver must be taken apart, disassembled and tested.

Testing does normally start from power supply.

Power supply is working, as you have power, but an incorrect voltage will trigger diagnostic mode, and the receiver will stay on but not operate.

First test on PSU is by checking for bulged or leaking capacitors , burnt spots, or broken solder joints. You do this kind of test just observing the board.

If you do not find anything in there , you inspect the rest of the boards.

Also check if some component is shorting the chassis, and inspect the input board connecting to TV, and the amp final board with power amp transistors or ICs.

If you do not find anything at a glance, then you will need to perform a series of test using a multimeter.

You test PSU volts out. Ensure PSU is not shorting to ground with chassis.

You test signal (input/output) board few components, and read voltages on flat ribbon connector to input output, check for contacts same as PSU.

You test the set of Transistors on amp final, the ones protected by dissipation plates and connected to output. If you heard a bang, a transistor in there, or the resistor at the base of the transistor had blown. If one of those resistor had blown, then also test the associated transistor.

Test all connectors to control panel.

After that test the main board, to do that you may need full schematics from complete service manual.

I scanned an exploded view , and provided link to download service manual for $7 , the complete manual is not available for free download.

I uploaded schematics here

You can buy service manual for your unit here.

Please do not forget to leave us feedback afterward.

Many thanks.

Posted on Apr 22, 2009

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It may need a firmware upgrade. The website is down right now for maintenance unfortunately but check with them to see if you have the latest firmware for the device. Hopefully that's all you need.

Posted on Apr 20, 2009

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