Did I Blow My Hu?

[ob1]

after installing my HU last time, i have a feeling some of my wiring was rushed and i've shorted a few wires. Not enough to make the fuse blow, but enough i think to have done some damage. I have 2 wierd symptoms:

1. when i press the cd eject button, the unit hangs. The music keeps playing, but all the faceplate lights go off and the CD doesnt eject.

2. my remote turn on signal wire is working in reverse now. It's 0V when the HU is on and 12V when i turn the car off!

recon these are related issues, or the thing is just old and buggered (almost 10 year old pioneer)?

[frx026]

Time for a new head unit.

Plenty of good ones available at the moment at good prices.

[Chris Rogers]

its toast.

that said the output IC drives the rem out so if you want to make a trip to RS components or prime then in should only cost $20-30...

does it have audio still?

[ob1]

if i REALLY needed it to work, id be picking your brain chris, as replacing one IC is not a hassle....but i'm lazy AND cheap, so i'm not going to do anything

Ive rewired the amp remote to take a signal from the acc./ign. line, which is almost as good. As for the CD that doesnt eject, i dont really care, as my primary music sources are a) radio and b) CarPC. EVERY other function on the unit works except for remote turn-on and eject, so it'll do for now.

cheers,

sean.

[Chris Rogers]

tightass

offer is there if you want it. I have a blau heidleberg unit here that doesn't have an hour on the CD mech. yours for the taking.

[siksII]

Sorry in advance for hijacking the thread, but speaking of blown headunits..

I have a Pioneer 5750, maybe 18months old.. I was driving around a roundabout with music playing and suddenly i heard a loud pop and from then onwards all i can hear is a nasty humming sound that pops and crackles... no music at all, but the HU responds and displays everything as usual.

When i disconnect the RCAs from the HU to the amp the humming stops, so i am quite sure it is head unit related.

I hope its wiring but i don't think it will be as i installed the unit myself, i soldered and heat shrunk all the wiring, no electrical tape anywhere.

Before i pull it out to have a fiddle/check, any advice? Is it most likely stuffed?

[Chris Rogers]

get a shop to tear it down too hard to tell you what is actually wrong with it.

[siksII]

get a shop to tear it down too hard to tell you what is actually wrong with it.

Thanks for replying.. from memory the unit cost me around $350ish and i know that electrical repairs arent cheap so if its stuffed i would really have to weigh up whether it is worth the hassle and $$ of getting it repaired

[Chris Rogers]

if you have done the output IC then its a $130-150 repair. the chip is most of it.

[Chris Rogers]

do you have audio out of the unit itself? have you checked the speakers for shorts to the car frame? some things to look at before you write that unit off.

[siksII]

if you have done the output IC then its a $130-150 repair. the chip is most of it.

Thats reassuring i guess.. Not sure if it means anything but it has never powered speakers, always had it hooked up to an amp for speakers and sub via RCAs just like it still is. It isnt directly connected to any speakers.

do you have audio out of the unit itself? have you checked the speakers for shorts to the car frame? some things to look at before you write that unit off.

The only sound that comes out of it is the nasty constant humming noise, this happens in every mode and regardless of volume.

Before i pull it out i plan on connecting up my ipod(or something!) with a 3.5mm--->2rca cable to my amp to see if the amps and speakers play music normally, if they do then i was going to assume that it is head unit related. Would that be an ok test?