Question about Harman Kardon AVR 225 Receiver
It works fine for a couple of minutes the starts to hum. If you turn up the volume it masks the noise but is till audible, also the video switching cuts out. after diexamining the components I have seen some heat discoloration in the power suply area and believe it to be power for the video board. disconecting the ribbon cable form the video board the hum goes away, and so does any video wich does'nt matter for me because my monitor does all the HD video switching. hope this may help with some noise problems.
SOURCE: Harmon Kardon AVR 235 no sound
Ensure that your speakers are connected to the terminals that you have your speaker selector switch turned to.
Then check that you have your device, whether it be a CD or DVD player, or turntable, plugged into the correct input and that you also have the correct input selected on the receiver.
Posted on Dec 30, 2009
The reason your receiver is causing you issues is cause of a 2 time Delay fuse's on the transformer board all you have to do is to by pass them.
Check the connector on the top front of the HDMI board. at the bottom of the connector it tells you the voltage of each wire the middle one is GND. should read 1.8v and 5.6v if the 5.6v line is dead. you key's in the front panel and sometimes video and audio as well.. will also stop working. all you have to do is to by pass them.
I will be posting a video later today on how to fix this issue. Regards,
Search for AVR 254/354 fix
Posted on Nov 03, 2011
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