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alansmith avatar image
alansmith asked

Victron 712 Smart Not Showing Display At All

I have no display on my BMV 712 Smart today. I did yesterday. Admittedly I was messing around in the engine bay in the area with the shunt in it yesterday and may have knocked it. But I'm pretty sure it was working when I finished. I see @theferrett had a similar issue at the start a couple of years ago so I have checked the red wire in B1 as suggested by @Gravely Headstone in that chat. I was getting 12V+. I have taken out and reinserted that wire multiple times and also the other cable that goes to the monitor (hoping for just a dodgy connection). I am thinking I will have to replace the PCB on the side of the shunt to see if that is the problem but is there anything else I can try before I spend money and wait for the part to arrive? Is there anything I can do to fault find at the actual monitor?

BMV Battery Monitor
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kevgermany answered ·

I don't think spares are available, except through Victron service centres, and they will insist on testing/repairing themselves.

First guess would be the cable between the shunt and monitor, but you really need another BMV to test the parts individually. So back to dealer.

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alansmith answered ·

I have found a PCB online https://www.sunshinesolar.co.uk/Item/SPR00053 I think this just screws on to the side of the shunt.

I am going to try and check further wiring but not sure where power for monitor comes from - learning as I go along


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kevgermany avatar image kevgermany ♦♦ commented ·
I just checked your PCB link.

The 712 PCB has a double green connector with 2 orange press buttons. You can see the empty space marked on the board for the extra connector. Either the wrong photo, or the wrong part.


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alansmith answered ·

I'm now puzzled by the connections on back of monitor. I was only expecting to see a telecom cable connected not black and red wires as well. Anyone know what these are? Are they the power supply to the monitor? There is no voltage across them - haven't traced the wires yet, its going to be tricky.img-4650.jpeg


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nickdb avatar image nickdb ♦♦ commented ·

Consulting the mystic manual, those are relay cables.

img-1585.jpeg

Power is supplied over the RJ12 connector.

There is a fused red cable going to the shunt and battery positive. Make sure that both are good.

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