Question about Harman Kardon AVR 2550 Receiver

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No sound from speakers and display panel blinks all the time.


I bought my avr 2550 second hand. The whole display panel blinks constantly (this surely cannot be right) and there is no 'test signal' sound in speakers either before setting up the analogue CD input or afterwards. I have tried my two existing stereo speakers in every stereo dolby mode. The result is the same.. blinking display and no sound. (I have already reset to factory defaults before all this)

Have I bought a piece of junk or is there a reason for these symtoms? Am I doing something wrong? This was supposed to be a present for my girlfriend and I am despairing here.



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Re: No sound from speakers and display panel blinks all...

More info from James - HK repair says it is a power supply problem which I must say I can hardly believe. Let's see if they are right. - price for repair 150 euros.


Posted on Jan 28, 2008

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Re: No sound from speakers and display panel blinks all...

There could be a short somewhere and the stereo is protecting itself. Try connection to a different pair of speakers.

Posted on Dec 04, 2007

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No display but have sound

Try resetting the system . if this doesn't work.
"Service" is needed .
To clear the AVR's entire system memory including
tuner presets, output level settings, delay
times and speaker configuration data.

1: first put the unit in Standby by pressing the System
Power Control button
2. Next press and hold the Tone Mode button 8 for three seconds.
The unit will turn on automatically.
this will clear all the proccessor.
Note that
once you have cleared the memory in this manner,
it is necessary to re-establish all system configuration
settings and tuner presets.

Good luck
Kind Regards

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1 Answer

Harman kardon avr 151 stuck on tv speaker mode

Try this.
To reset the AVR's processor:
1. Press the front-panel Standby/On switch for more than three seconds to turn the AVR
off (the Power Indicator will turn amber).
2. Press and hold the front-panel Surround Modes button for at least 5 seconds until the
RESET message appears on the front-panel Message Display.
NOTE: After performing a processor reset, wait at least 1 minute before pressing any
Source Selector buttons.

Good Luck
Happy to help

Jan 04, 2014 | Harman Kardon Audio & Video Receivers

1 Answer

I bought a Denon AVR 791 receiver two months ago, work great, sound great with my Definitive Technology Speakers but 3 days ago while I was watching a movie on my PS3 the receiver turned off on the higher...

Clearly, it thinks you're overdriving it.

Blinking Power Indicator every 2 seconds means the internal temperature is high. (Page 76 of the manual)

Every half-second - speaker impedance too low.

Consider the load presented by the speakers and what their minimum impedance might be.

Check for loose speaker wires.

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3 Answers

What is the master reset code for the denon avr 1508?

Turn the unit off by main switch (not a standby button).
Press and hold "Speakers-A" and "Speakers-B" buttons and turn on main switch.
Display blinks.
Release the buttons after 3 seconds.
Receiver is reseted.

Jul 20, 2009 | Denon AVR-1508 Receiver

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Humming sound(speakers)when HK AVR 3550 is powered up?

yea try use in a monster power strip it clears al of that up it is picking up noise from all the wires

Apr 02, 2009 | Harman Kardon HK 3550 Receiver

2 Answers

Humming sound (speakers)when HK AVR is powered up.

In my case the buzz was only on front speakers. There are 3 capasitors (100uF/25V) very close to the cooling ribs of 3 regulators in the power supply. In my case the C922 was bad.

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Try this, turn off the unit and remove the AC power cord from the electrical outlet, Hold the AUTO button and PCM button and plug the unit back into the electrical outlet, if the display starts flashing with 1 second intervals then release the 2 buttons, this initialized the microprocessor

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Display gone, no longer functioning

Green light but no display- most likely main transformer is gone (60%), 35%- blown main fuse, 5%- bad display or power supply. You are lucky if unit is still under warranty. Solution- repair shop.

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time to reset the microprocessor. See page 87 in manual.
1) switch off the unit using the main unit's power operation (small power button)
2) hold the PURE DIRECT button and DIRECT button at same time and turn the main unit's power operation on.
3) wait for entire display to flash in 1 second intervals

now the speakers need to be set up again but zone 2 will be working. i suspect a power surge causes the microprocesser to be corrupted. i put a power surge protector and have not had problems (lately).

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More than likely the protector circuit is getting activated... You can't go below 6 ohms on the surround back which means you need 12 ohm or higher speakers for outside (since the two outputs for surround back/zone2 are in parallel). As a simple diagnostic test, disconnect one speaker and see if the sound survives longer than 2 seconds.

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