Harmon Kardon AVR 230 produces no sound and no monitor out.

Question edited for clarity.
Question moved to Harmon Kardon AVR category.

They all need remotes. You just buy a replacement.

https://www.google.com/search?q=harman+kardon+avr+7200+remote+replacement

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Bad fuse? power supply problem, blown output transistor. It is an old discontinued model, so any stereo repair shop might be able to fix it.

Try using the RCA outputs once and see if that works..One other thing don't use the phono input on the receiver as it could damage the amplifier

Email or call the manufacturer

http://www.harmankardon.com/EN-US/Products/Pages/ProductSupportDetails.aspx?PID=AVR%20254

Hi if there is an optical out on the television i would use that direct to your Harmon Kardon AVR 125, the sound would be in sync with picture, as the source is the same.

Sounds like the setup info got scrambled in the receiver. Re-program the TV input...from optical or coax or whatever way it is going into the receiver.

?????? Details, please. What works?

I also had this UNLOCK message on my Harman Cardon AVR 130.
The reason for this error was - in a hurry I've plugged the optical input into optical OUT! Double check that your connections in the back are correct and hopefully it fixes your problem.

Cheers,
Sergey

I got the answer for No-1.
The balance was turned on the Right Channel. That is why Left Channel was not working during the Channel test.
For Channel test the Balance should be in the middle so that both Right and Left Would be heard.

I am working on my Subwoofer Isuue.

I opened the Back Panel and Yet I could ot figure out any issues.

I will open the front panel and see if any connection is loose.

Try hooking up a yellow video wire from the back of the AVR 225 Monitor out. Should be at the end of the 7 or 8 yellow video ports on the back of the stereo. Next plug the other end into a yellow video in on a t.v. Get your remote, (Harmon/Kardon) and make sure the t.v. is on the correct video input and hit the OSD(on screen display) button on your harmon remote. There should be a setting in there that says VFD under ADVANCED menu option that allows for turning the front of your stereo lights on and off and dimming them half way also. OFF/HALF/FULL are the 3 options I believe.

If this doesnt solve it your display may have crapped out on you.