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Shark Rotator Powered Lift-Away XL Capacity, model NV755. It can convert from a push vacuum to a hand-held vacuum. Repairs and troubleshooting found here may also be applicable to models NV652 and NV752.

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Shark NV752 vacuum Motherboard

We have power to the brush and power to the light. Main suction motor does not run. We meter power going into the small board before the motor, but no power detected going out. Is this a replaceable board?

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Hi,

Don't know if there is a replacement board or not but post some close up pictures of both sides of the small board and perhaps someone may spot something or advise how to test it.

Here's how to do this

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Hi,

I can’t find a replacement board online using the board number or the model number but perhaps you may be able to check a few things on the board itself.

The major black component marked brf ss 124dm shown in image 1 is a 24V relay which I suspect operates to connect power to the motor. Here are the specifications for the relay which may be of some help.

Looking at image #1, did you test the fuse (F1 on board) with an Ohmmeter to maker sure that it is OK.

Totally disconnect the power from the cleaner when testing with an Ohmmeter.

Also see the image below where I have indicated what to me looks like suspect solder joints, that you may wish to check to ensure that they are not “dry” solder joints i.e. open circuit. Re-solder them if necessary.

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(click on image to enlarge for better viewing)

Check that you can hear the relay operate (click) when you go to turn on the motor. If not, with the power totally disconnected test the relay coil using an Ohmmeter, (1600 Ohms).

Also test D14 (diode) and ZD11 (zener diode) to check that they are not open circuit. When testing diodes you may have to disconnect one leg from the board to get an accurate test (low resistance in one direction, very high resistance in the other direction)

If you can’t hear the relay operate and the relay coil and diodes test OK it may be a case of tracing the relay coil operate circuit to find out why it doesn’t operate when power is applied to the board. Slow process without a schematic ;-)

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Thanks for the review! The fuse did check good. I appreciate the advise and I will check on the solder condition later this week.

par

Not an electrical engineer but I have the same problem and believe it’s the relay itself, and it’s sticking. In my case, tapping on the relay causes the motor to start and it will continue to run until I press the power button. I’m torn between buying a main board on eBay for $24 or just spending $65 to get an entire refurbished base unit.

par

@mdboyd

Can't you just replace the relay?

There usually is information printed on it indicating type and specifications etc.

Search on places such as digikey.com and mouser.com to find replacements or even Ebay

This one was found by using the info on the relay in the image above i.e. BRF SS 124 DM BUT yours may be different so verify first

par

Yes, I found the relay online and am sure someone with adequate soldering skills, time, and patience could. For me, I don’t want to go weeks without a working vacuum in the event it doesn’t pan out. I decided to buy a refurbished base and will probably pull the main board from the old unit and attempt it. It’s a shame that a $1 relay renders a $250 vacuum useless.

par

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