Why will my LG blu ray will not connect to marantz 7200 receiver?

SOURCE: No Audio when I play Blu-Ray discs with Dolby TrueHD

For dolby digital to work you have to have the optical or coax cable hooked up to the reciever ,The HDMI cable is for digital video and audio output but does not support dolby digital out the cable into your reciever , so just turn off the dolby digital on your reciever and you should hear the sound.
here is more info

Dolby TrueHD is an advanced lossless multi-channel audio codec developed by Dolby Laboratories which is intended primarily for high-definition home-entertainment equipment such as Blu-ray Disc. It is the successor to the AC-3 Dolby Digital surround sound codec which was used as the audio standard for DVD discs. In this application, Dolby TrueHD competes with DTS-HD Master Audio, another lossless codec from Digital Theater System.
Dolby TrueHD uses Meridian Lossless Packing (MLP) as its mathematical basis for compressing audio samples. MLP was used on the earlier DVD-Audio format, but details of TrueHD and DVD-Audio differ substantially. A Dolby TrueHD bitstream can carry up to 14 discrete sound channels. Sample depths up to 24 bits/sample and audio sample rates up to 192 kHz are supported. Like the more common legacy codec Dolby Digital, TrueHD bitstreams carry program metadata. Metadata is separate from the coding format and compressed audio samples, but stores relevant information about the audio waveform. For example, dialog normalization and Dynamic range compression are controlled by metadata embedded in the TrueHD bitstream.

SOURCE: I have the following hardware:

Remove the HDMI cable (out) to the speakers from the receiver.
Connect regular speaker wire from the receiver to the speakers.
Of course, remove the (now extra) HDMI cable from the tv.
That will remove the loop.

SOURCE: Marantz SR 7200

It is likely that the PA stage has developed an offset voltage in the output stage. The faulty amplifier channel can be found by progressively disconnecting the collectors of the of the power transistors until the protection fault disappears. Once the faulty channel is found the the cause of the offset has to be traced to the faulty transistor or resistor. Don't forget that if you can smell smoke or burning then there are likely to be components(esp transistors) that have been damaged by the fault.
I had a Luxman unit that destroyed 5 transistors in the output stage that was due to an open .5W resistor in the driver stage.
Good luck.