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300 watt invertor reverse polarity damage

Is it cheaper to replace it than to repaire it

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Some units have a diode across the input leads that blow and short out if reverse polarity is applied. It's a safety device to protect the unit. If your's has one, replace it.

Geno

Posted on Mar 11, 2008

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My TV takes 20 minutes to turn on


The power supply have sometimes used TAIWAN CAPACITORS they must be replaced in the power supply board most are the tolerances of the capacitors in voltage too tight. if you replaced the capacitors 10 v to 16 v and the 25 to 35 v models then the format of the cup it is not to big. 105 or 85 degrees capacitors of a good factory make working the tv for years but also if there is someone who will repair then also replace the capacitors in the circuit who looks the same size and voltage of the backlight inverter because to protect of the very sensitive step up transformators that will get to high voltages and will damaged in some time if you forget that. Samsung have most of the times bad capacitors and also some 2 watt resistors in mains secundary replace also a few because the 2 watt resistors of samsung are not to trust. in mains, replace with every other resistor of 2 or better 3 - 5 watts .

Apr 04, 2015 | Samsung Hlr6167w 61-inch Widescreen Hdtv...

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My audio dont work because 2 cables hit and it turn off how can i fix it


Congratulations! You have just made a paper weight. By touching the wires together you have shorted out your unit. You can take it to a repair shop, but you'll find it just cheaper to buy a new unit.

Aug 17, 2012 | Insignia Ns-h2002b 5.1 Channel 200 Watt...

1 Answer

Hi can you connect a motorbike battery to a panasonic rx.es20 portable stereo and how can this be aceived


Yes you can connect but care must be taken to check the following details as a WRONG connection can damage the set.
1. Make sure that the battery has the same VOLTAGE, current(Amps) will be high and is Ok.
2. The POLARITY to be wired from the battery to the player MUST be CORRECT- Make sure this is not reversed.
3. All connections must be done with care and there must not be any accidental shorting of the wire as the high current of the battery can be dangerous, cause fire.

Jul 02, 2011 | Panasonic Audio & Video Receivers

1 Answer

Constant buzzing sound in all speakers


Sounds like either a transformer or amplifier problem. You haven't reversed polarity on the speaker connections? or changed the speaker sizes, Ohms, ect? Probably a resistor, diode, or condenser in the amplifier causing feedback through the speaker system. It's doubtful both speaker coils went out at the same time. Possible, but doubtful.And you mention that the volume "SPIKES" from time to time. Could be as simple as corrosion on the volume "pot". Basically a Rheostat that allows more signal the farther you turn the knob. If so, you can clean that yourself with a spray product available at any Radio Shack. It is for cleaning electonic components and leaves no residue. You could have this checked at any competant electronics shop, but BEWARE, the "Bench Fee" to test may be more than the value of the system. I would ask what the "bench fee" was to determine a problem, and then what the labor costs would be to repair either a transformer or amplifier with resistors, diodes, capacitors, ect. Electronic equipment tends to "break down" over time and use, and sometimes you can replace a component cheaper than repair. If part of a rack system, then you may want to retain this sub-part and repair may be your choice. I would ask about the fees to test, and the costs of labor to repair, before turning it over. How old is the system?

Sep 26, 2009 | Kenwood VR-7070 Receiver

1 Answer

Says overload


Your speakers may be underpowered by your receiver. Check the watts and impedance of the speakers, and the wattage of your receiver to make sure they closely match. (impedance is calculated in ohms- indicated by an omega symbol written near the wattage rating)
"Overload" may also mean that the amp went into protect mode, and that means that you're OVER-powering your speakers and it wants to protect them from damage due to impedance mismatch.
But- if the impedance and wattage match between the speaker and the receiver/amp, you should check the polarity of the speaker cables (+/-) BTW- never put 2 speakers in 1 output- that will almost always cause something like this and will sound bad.
I hope this helps.

May 31, 2009 | Technics SA-AX540 Receiver

2 Answers

Damage due to reversed polarity


hello unless you know something about electronics of course you may repair it ...this kind of equipment are so sophisticated take extremely care....i think it would be better to get a estimated cost.......saludos

Nov 21, 2008 | Audio & Video Receivers

1 Answer

Probably too simple to be true .. but I have a 'record player' in an old car, and the small motor that drives the turntable is running in reverse (incorrect) direction. Is thi simple a matter of...


Hi,

I agree, it is old. None the less, yes on reversing the wiring of the motor. All DC motors are polarity affected.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Aug 19, 2008 | Audio & Video Receivers

1 Answer

Cb radio reverse polarity damage


The diode is there to protect against rev polarity. Simply replace it with soomething like a 1n4007.

Geno

Mar 10, 2008 | Audio & Video Receivers

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