tv loud hum

Submitted: Wednesday, Jul 23, 2008 at 18:07

ThreadID: 60077 Views:2559 Replies:5 FollowUps:7

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bloosted

hi everyone i have a flat screen TV which i have connected straight to 12v and i have a 12v compressor fridge,the problem is when the fridge is running it makes the tv develop a loud hum?the tv has a direct pos and neg wire to the batteries,so i was wondering if anyone knows of a fix or if there is a filter of somesort? thankyou in advance and a great forum you all have.

Daryl

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Reply By: Member - barry F (NSW) - Wednesday, Jul 23, 2008 at 18:15

Wednesday, Jul 23, 2008 at 18:15

Turn the volume down!! LOL. Sorry, I couldn't help myself, so will get back in my kennel & behave.
But there will be many others on this site that will give you meaningful advise & steer you in the right direction. Cheers & good luck.

AnswerID: 316783

Follow Up By: Sir Kev & Darkie - Wednesday, Jul 23, 2008 at 18:19

Wednesday, Jul 23, 2008 at 18:19

Been called for dinner hey

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FollowupID: 583045

Follow Up By: Member - Mark G (NSW) - Wednesday, Jul 23, 2008 at 18:24

Wednesday, Jul 23, 2008 at 18:24

sounds like it doesn't it KEV, my hand brake makes that 'hum' sound too

FollowupID: 583046

Reply By: Notso - Wednesday, Jul 23, 2008 at 18:27

Wednesday, Jul 23, 2008 at 18:27

On a more practical note?

Have you checked the voltage at the telly when the fridge is running. It it is low it may affect it.

Also you may have to get a suppressor fitted to the fridge. Now I don't know anything about them but a good sparky should be able to help.

AnswerID: 316788

Follow Up By: bloosted - Wednesday, Jul 23, 2008 at 18:34

Wednesday, Jul 23, 2008 at 18:34

the batteries have a charger and solar panels hooked up all the time so i dont think voltage is it

FollowupID: 583052

Reply By: Robin Miller - Wednesday, Jul 23, 2008 at 18:35

Wednesday, Jul 23, 2008 at 18:35

Takes a fair bit to filter out that low frequency, Daryl.

Question - what sort of 12v supply is it connected to.

If its some sort of powersupply then you may well be simply overloading it and when you do the hum passes thru much more easily.

First step I would do would be to connect the TV straight to a 12v car battery and then seperately connect the fridge to that battery (no charger on battery).

Its quite possible that this connection will show no hum , hence revealing a weakness in your power supply/charger arrangement.

AnswerID: 316791

Reply By: bruce - Wednesday, Jul 23, 2008 at 19:31

Wednesday, Jul 23, 2008 at 19:31

I would have thought that if it is only making the hum when the fridge is running , then that is where the problem lies...a fridge mechanic would probably be able to fix it or supply a solution in next to no time...do you know a friendly one ?...ie one that will not charge you for a little bit of advice or not much anyway...yes I do know that there is no such thing as a free lunch....cheers

AnswerID: 316811

Follow Up By: Pomgonewalkabout - Wednesday, Jul 23, 2008 at 20:41

Wednesday, Jul 23, 2008 at 20:41

If the TV is 240v try running it off an invertor?

I would say that the fridge is putting some ripple into the DC line
So a suppressor or something should cure it?

cheers

FollowupID: 583090

Follow Up By: bloosted - Wednesday, Jul 23, 2008 at 21:23

Wednesday, Jul 23, 2008 at 21:23

do you know where you put the suppresor?

FollowupID: 583104

Follow Up By: Pomgonewalkabout - Thursday, Jul 24, 2008 at 07:41

Thursday, Jul 24, 2008 at 07:41

First I would make sure that with both the TV and fridge running you still have 12 volts.

I'm no expert but I was thinking along the lines of those suppressers fitted to car stereo, used to prevent ignition noise?

cheers

FollowupID: 583150

Follow Up By: Member - Christopher P (NSW) - Thursday, Jul 24, 2008 at 18:30

Thursday, Jul 24, 2008 at 18:30

you need to buy a suppressor from the local car audio shop probaly above 40 amp as the hum is from the motors of the fridge. If you take both down to the local car audio shop you might be able to try until you find the correct one, if they are nice, super cheap , repco and other auto parts suppliers might have them.

Cheers

Chris

FollowupID: 583302