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I sadly reversed the DC polarity could I repair this myself, it appears that it does not have a fuse. It does not work since I did this to my r/v tv.

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You burned up the power supply

Posted on Mar 31, 2015

Testimonial: "Terry ( I Thank You) trying to get home from fl. to mn. and no tv when I stop to rest thank you i thought i was the only person up thinking about repairs.Power supply sounds serious for retired plumber. Very Helpful"

  •  johnny rebel
    johnny rebel Mar 31, 2015

    take it to a repair shop and get an estimate.good luck

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1 Answer

Polarity reverse problem in icom 706 mkiig


Quite a few things can go wrong in this situation. There is an internal fuse that can blow, but the first problem will be a rather large diode that is directly across the DC power input. Reverse polarity will cause this to short, and it usually stays shorted. It will need to be replaced. Then, you should look for open traces from the +12V line to the fuse holder, and the collector of the HF output transistor. If you do not see close to ZERO ohms when your leads are attached, then you have a trace blown off the board.

Depending on how long you left the reversed power on, and if you replaced the inline fuses with a larger value, repair cost can run you from $2 to several hundred, just for the parts! I would take it to someone that knows how to work on this radio. It is not an easy radio to work on.

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What is reverse polarity


Reverse polarity means in a dc voltage scenario (boat camper anything 12 volt Dc) thatvthe positive ( red) and the negative ( black ) have been switched or reversed.In a 120 volt ac scenario (house ,garage , outlet etc.) It means the hot
( black ) and the neutral ( white) are reversed.
hope this helps.

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Reverse polarity hook up blew fuse link. Where can i get the correct fuse link to solder into the stanley inverter pc809 800watt?


Hmmmmm, well that`s unfortunate , i can tell you that most electronic devices that connect to low voltage DC supply's are protected bye a protection diode and the fuse link you think it might be is a circuit trace internal.
an 800 watt innverter draws about 80 to 100 amp to produce the 800 watt output and you must have 2 40 amp fuses or 3 30 amp fuses customer replaceable, if you did not damage the components in your device all you kneed to do is to repair the circuit trace and replace the reverse polarity protection diode to restore normal operation

there are no fuse links internal to inverter power supply's

best regards Falco

Oct 27, 2013 | Electronics - Others

1 Answer

Does the jl audio 250/1 have any internal fusing that would affect output . my buddy hooked up booster cables backwards and it did blow main fuse at battery but now lights are on and noboby is home.


I have seen circuit traces litterally burn up from reverse polarity. Also the capacitors on the 12 volt main line can smoke and causing the DC/DC circuit not to function. Traces can be repaired with the proper sized copper tape and capacitors are cheap. The only way to be sure is to open the unit up, look for strange liquids and evidence of burn or fire.

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More than likely, the inline power fuse opened with the reversed voltage applied. This will require opening the camera, this is no easy task and should be left to a qualified technician.

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1 Answer

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Typically, fuses protect the "hot" side of circuits. The reverse polarity puts the ground plane on all the power feeds in the circuit, and the normal ground plane becomes hot with unregulated voltage, which will fry anything not rated for the full supply, and it will do it before the fuse blows. There are often fusible links in small voltage circuits such as camcorders, and they're basically low ohm resisters that open up when overloaded, and act as fuses. You have to really know circuitry to spot them, or have a schematic. If you can get a used camera with a lens problem on ebay, you could probably swap out the circuit boards and get it to work, otherwise, the dreaded repair guy might have to be engaged. I've rarely seen a camera revived after having this happen to it. Sorry, wish I had better news, and good luck.

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2 Answers

Power Source


Are you certain the polarity of the connections to the TV are correct? If you connected them in reverse you may have damaged the TV. If there's a fuse in line check that too. BMW

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