Double Din Car Headunit Brand Unknown

[Bloopeta]

Not something I have ever attempted before, but knowing I dabble with TVs, a friend of mine asked me to have a look at this for him.

I dont know what brand it is, think its just some cheap chinese generic rubbish

Someone has apparently bought it brand new, wired it up wrong somehow, blew fuse on unit, fuse in car, amd said it smoked slightly and could smell it.

Replaced fuse, but no signs of life, is there anything I can do or is it just fit for the scrap?

Wouldnt know where to start personally so any help grately appreciated.

[vinceroger69]

Re: Double Din Car Headunit Brand Unknown

have you removed the pcb and checked if there is any trace damage on the underside of the pcb

[Bloopeta]

Re: Double Din Car Headunit Brand Unknown

have you removed the pcb and checked if there is any trace damage on the underside of the pcb

I havnt mate as yet, all ive done is open it up to take pics, ill do that next and report back

[stj]

Re: Double Din Car Headunit Brand Unknown

if you call that well serviceable device crap, you obviously have not seen inside the italian shit the car makers fit.

[R_J]

Re: Double Din Car Headunit Brand Unknown

Seems to be a Xtrons pb86mtvap, There is a diode D2? near the fuse, have you checked it? Check the resistance between ground and power input.

[Bloopeta]

Re: Double Din Car Headunit Brand Unknown

if you call that well serviceable device crap, you obviously have not seen inside the italian shit the car makers fit.

Your right, I havnt lol, as I say, Ive never opened one up before, never had to until now

[Bloopeta]

Re: Double Din Car Headunit Brand Unknown

Seems to be a Xtrons pb86mtvap, There is a diode D2? near the fuse, have you checked it? Check the resistance between ground and power input.

Ill have a look when im home, I litterally just opened it up and took a few snaps when I had 5 mins spare earlier, havnt done anything else as yet

[Bloopeta]

Re: Double Din Car Headunit Brand Unknown

have you removed the pcb and checked if there is any trace damage on the underside of the pcb

I havnt mate as yet, all ive done is open it up to take pics, ill do that next and report back

Heres a pic of the underside, looks ok to me, but im no expert

[vinceroger69]

Re: Double Din Car Headunit Brand Unknown

Heres a pic of the underside, looks ok to me, but im no expert

yes underside looks fine time too check what r_j suggests now

[Bloopeta]

Re: Double Din Car Headunit Brand Unknown

yes underside looks fine time too check what r_j suggests now

On with that now m8, I think the diode is goosed, am I best off taking it out of the board to test incase pf false positives?

[R_J]

Re: Double Din Car Headunit Brand Unknown

Many times they use a diode across the 14 volt input for protection, If you supply reversed voltage, the diode conducts and blows the fuse, or in some cases the fuse will also short. You may get lucky and it's only a shorted diode.

[Bloopeta]

Re: Double Din Car Headunit Brand Unknown

Many times they use a diode across the 14 volt input for protection, If you supply reversed voltage, the diode conducts and blows the fuse, or in some cases the fuse will also short. You may get lucky and it's only a shorted diode.

Was exactly that, thankyou very much for your help, and to everyone who replied, much appreciated

[R_J]

Re: Double Din Car Headunit Brand Unknown

Good to here its working, make sure you replaced the diode for continued protection.

[Bloopeta]

Re: Double Din Car Headunit Brand Unknown

Good to here its working, make sure you replaced the diode for continued protection.

Yeah replaced it with an exact match as my friend who it belongs to had a spare unit with a broken screen, so took it out of that.