Complete Idiot!!!!! - Electronic Circuits Projects Diagrams Free

DENBOY · 12th August 2008, 05:56 PM

Hi guys,
I am new to this forum and have some questions regards wiring leds,
but first I have just made up a lead to connect my lcd tv to a 12 volt supply in my motor home but got it wrong (+ to - - to +) hence the title of this thread. The tv will now not work, i have had the back off and can't see any fuses or resets, have i wrecked it or what? and is it worth taking it to a repair shop or is it a skip job? any advice please.
thanks dennis

**Krumlink** · 12th August 2008, 05:59 PM

Did you take AC cord and connect it directly to the battery?

DENBOY · 12th August 2008, 06:02 PM

no made a lead to connect to the 12 volt input of the tv bypassing the adapter.
dennis

**Krumlink** · 12th August 2008, 06:07 PM

Try connecting the AC cord up and seeing if that works. If not, good luck

DENBOY · 12th August 2008, 06:10 PM

nope I tried that, the only power in on the tv is the 12 volt one (drat and curses)
dennis

b_reagle · 12th August 2008, 06:20 PM

You would think it would have some kind of internal protection? Diode maybe? I am not sure, just think somethings have a diode for protection.

audioguru · 12th August 2008, 07:52 PM

I don't think the manufacturer of the TV would spend money on an "idiot diode" because this problem of backwards polarity would hardly ever happen.

The repair of the blown up circuit by a technician might cost more than a new TV.

Hero999 · 12th August 2008, 08:14 PM

The chances are it's just the power supply that's ruined but it still is hard to repair. You'll need to replace all the semiconductors and polarised capacitors.

**Nigel Goodwin** · 12th August 2008, 08:34 PM

Quote:

Originally Posted by audioguru

I don't think the manufacturer of the TV would spend money on an "idiot diode" because this problem of backwards polarity would hardly ever happen.

I agree, it's NOT designed to be connected to an external 12V source, only it's currect power supply - so it probably doesn't have any reverse polarity protection.

Mikebits · 12th August 2008, 08:48 PM

Maybe the input has one of those little SMT fuses that does not really look like a fuse.

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12th August 2008, 05:56 PM	(permalink)
DENBOY	Complete Idiot!!!!! Hi guys, I am new to this forum and have some questions regards wiring leds, but first I have just made up a lead to connect my lcd tv to a 12 volt supply in my motor home but got it wrong (+ to - - to +) hence the title of this thread. The tv will now not work, i have had the back off and can't see any fuses or resets, have i wrecked it or what? and is it worth taking it to a repair shop or is it a skip job? any advice please. thanks dennis

12th August 2008, 05:59 PM	(permalink)
Krumlink	Did you take AC cord and connect it directly to the battery? __________________ MechTronics World of Warcraft is a disease

12th August 2008, 06:02 PM	(permalink)
DENBOY	no made a lead to connect to the 12 volt input of the tv bypassing the adapter. dennis

12th August 2008, 06:07 PM	(permalink)
Krumlink	Try connecting the AC cord up and seeing if that works. If not, good luck __________________ MechTronics World of Warcraft is a disease

12th August 2008, 06:10 PM	(permalink)
DENBOY	nope I tried that, the only power in on the tv is the 12 volt one (drat and curses) dennis

12th August 2008, 06:20 PM	(permalink)
b_reagle	You would think it would have some kind of internal protection? Diode maybe? I am not sure, just think somethings have a diode for protection. __________________ The thought is in the question; The information is in the anwser.

12th August 2008, 07:52 PM	(permalink)
audioguru	I don't think the manufacturer of the TV would spend money on an "idiot diode" because this problem of backwards polarity would hardly ever happen. The repair of the blown up circuit by a technician might cost more than a new TV. __________________ Uncle $crooge

12th August 2008, 08:14 PM	(permalink)
Hero999	The chances are it's just the power supply that's ruined but it still is hard to repair. You'll need to replace all the semiconductors and polarised capacitors. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez

12th August 2008, 08:48 PM	(permalink)
Mikebits	Maybe the input has one of those little SMT fuses that does not really look like a fuse. __________________ Forget injuries, never forget kindnesses.