Problem with Mitsubishi M-VR700 reciever

8270 Views 4 Replies 4 Participants Last post by Fretnoyse5, Oct 19, 2011

TNS8799

Discussion Starter · Nov 29, 2008

I'm new to this forum and have found it interesting.

I have had intermitent problems with the sound stopping on my Mitsubishi M-VR700 reciever. If it quits I can still hear sound if I plug into the head phone jack but nothing comes out of the 5 speakers. I can turn the unit off and on a few times and the sound may or may not come back. I can come back to the unit a few hours later and it may or may not work again. I have check all inputs and eliminated external problems. Does anyone have any ideas?

Thanks
Tom

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lcaillo

· #2 · Nov 29, 2008

Welcome to the forum.

I would be looking for some loose connections, but there are too many possibilities to say much without some troubleshooting. A unit of this age is likely not worth putting a lot of effort into, however.

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warar3

· #3 · Feb 8, 2010

Hi i have the sasme receiver and i bought it from a person from a yard sale for $5 the unit powers on but no sound out of any port i am checking more in to it and i will kee you popsted, its not the fuse i think its the transisters on the unit BEST OF ALL dont trust mitsubihi with sound eqp yamaha or sony

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lcaillo

· #4 · Feb 8, 2010

Please use care in posting and check your spelling and grammar. It makes your posts more clear and understandable.

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Fretnoyse5

· #5 · Oct 19, 2011 (Edited)

I bought a Mitsubishi M-VR700 which produced no audio from the speakers, but with headphones, a tiny bit of audio was detectable with the volume control on max. This solution was posted on fixYa by Mojorisin65 some time ago: "Facing the receiver directly behind the MITS logo & power button is a vertical board with a large IC on it, try flexing the board near the IC while turning the reciever on & off or changing input modes, there is a cold solder joint on this board which I haven't found yet. I understand this is a common problem with the MITS M-VR700-900, Onkyo TXDS-575, & Integra DTR5 or DTR5.1 (all made by Onkyo)."
I gently flexed the board as described, and Boom, all audio was back as it should be. I suspect Mojorisin65 is correct about the cold solder joints, but with SMT components, it could be very difficult to find. It may very well be on one or more of the 48 pins on the large IC. This IC gets rather warm during operation, which may explain why some units may work until it heats up. The chip gets warm, and ‘twists” enough to lift the bad pin(s). In an attempt to deal with this symptom, I superglued a TO-220 heat sink to the top of the IC (don’t let it touch the case of C-716). The heat sink is dissipating a fair bit of heat, and so far, this ‘fix’ seems to be doing the trick. RJD 10.18.11

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