Burnt out brand new 12V tv

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Burnt out brand new 12V tv

Postby bels paradise » Fri Jul 13, 2018 9:04 am

Hey everyone...tried to hookup a 12v tv in my 2460, I figured I would run it off the cabin lights breaker. When I turned on the breaker ..pop ...pop I blew the capacitors any ideas as of why....could it have been some sort of power surge? I have no idea...bought a new tv now afraid to hook it up ,don't want to burn out another one....help!!.
Thanks .
Joe.
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Re: Burnt out brand new 12V tv

Postby gofast24 » Fri Jul 13, 2018 10:23 am

What TV did you buy? Did it have a direct 12 VDC power input connection on the back? Did you reverse the + and - when wiring it? Did u use a cigarette lighter plug into a 12 VDC socket to power it? How did you determine that capacitors blew and not the circuit breaker tripping?? So you just went out and bought a new TV (same brand/model?), did you return the failed TV? Did you read the owners manual for the failed TV and did it indicate you can connect it directy to a 12 VDC power source/ or only cam with a 120 VAC to 12VDC power brick?
in order to give any good advice need to know more info.

PS: No, dont plug in the new TV until you figure out what happened to the first one :)
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Re: Burnt out brand new 12V tv

Postby Chris_in_Texas » Tue Jul 24, 2018 9:02 pm

Electrolytic capacitors are polarity sensitive, and will explode if hooked up backwards. As Gofast mentioned, is the TV made for 12VDC or does it use 120VAC and have a power brick down to 12V? If it was designed for 12VDC then most likely you had reverse polarity on the plug. That being said a good design has reverse polarity protection as well, and just have either not done anything or popped the fuse inside the TV. A breaker won't react fast enough to save it.

Keep in mind that the 12v in the boat can and will go above 14V when charging so if its a purpose built 12VDC TV that shouldn't be a problem, but if it uses a power brick then all bets are off.

Also if it does use a power brick and says 12V is it AC or DC 12V? Some electronics will use a cheaper power brick and just take 120VAC down to 12VAC and then put the full wave rectifier in the TV itself on the power board. I have seen that before.
Thanks, Chris

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Update

Postby bels paradise » Mon Jul 30, 2018 3:14 pm

I reversed the polarity when I tried to hardwire the tv directly. I have since installed a 12v cigarette lighter plug and plugged the tv directly into that and it works fine . Thanks for all the help. :D
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Re: Update

Postby gofast24 » Thu Aug 02, 2018 10:50 am

bels paradise wrote:I reversed the polarity when I tried to hardwire the tv directly. I have since installed a 12v cigarette lighter plug and plugged the tv directly into that and it works fine . Thanks for all the help. :D

Thanks for being honest, yes, lots of experience doing things on you own, I have lots of experience doing things on my own and now at 70 have a lot of hands on experience that you never learn in college :) How did you determine that you wired it backwards? Still wonder if you brought the original TV back?
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Re: Burnt out brand new 12V tv

Postby bels paradise » Mon Aug 06, 2018 3:05 pm

I used a voltmeter to determine which line had a negative voltage.....and a friend is trying to replace the parts that were damaged
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