headunit wired back to front? not working now..

marko · 27th December 2009, 10:47 AM

simple question ( i hope!), what blows on a headunit if you wire pos and neg back to front? the ubit no longer powres up...

mike49504 · 27th December 2009, 10:51 AM

Theres usually a diode behind the power connecter in the unit check that to see if its still good also check the board for open traces First things id check

marko · 27th December 2009, 10:53 AM

so it could be something really simple? i'm only used to working on amps!!

jol50 · 28th December 2009, 05:38 PM

I've fixed a small number of them, just follow the ground and power into it and you should find something blown right away. Most but not always that is all that is wrong, most put something there to protect it like a diode/etc that blows. Some of them have the power across the board though have to follow the trace then.

I Am An Idiot · 29th December 2009, 12:08 AM

If the unit was properly fused, it should have only blew a fuse. Have you used a volt meter to make sure the unit is getting power?

27th December 2009, 10:47 AM	#1
marko diyAudio Member Join Date: May 2004 Location: donnyuk	headunit wired back to front? not working now.. simple question ( i hope!), what blows on a headunit if you wire pos and neg back to front? the ubit no longer powres up...

29th December 2009, 12:08 AM	#5
I Am An Idiot diyAudio Member Join Date: Mar 2007	If the unit was properly fused, it should have only blew a fuse. Have you used a volt meter to make sure the unit is getting power? __________________ If it ain't broke Don't fix it

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27th December 2009, 10:51 AM	#2
mike49504 diyAudio Member Join Date: Sep 2006	Theres usually a diode behind the power connecter in the unit check that to see if its still good also check the board for open traces First things id check

27th December 2009, 10:53 AM	#3
marko diyAudio Member Join Date: May 2004 Location: donnyuk	so it could be something really simple? i'm only used to working on amps!!

28th December 2009, 05:38 PM	#4
jol50 diyAudio Member Join Date: Nov 2007	I've fixed a small number of them, just follow the ground and power into it and you should find something blown right away. Most but not always that is all that is wrong, most put something there to protect it like a diode/etc that blows. Some of them have the power across the board though have to follow the trace then.

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