Two radios dead, please help! Not burnt

[nolazach]

Okay let me start by saying I am pretty confident in my abilities to install car stereos. I take a few precautions and always un-hook the negative battery terminal.

Yesterday my friend came up to me and asked me to help him with his Suburban. He had an aftermarket Alpine with a four channel amp on his highs and a single channel on his lows. He told me that only his front and rear speakers worked, not his back doors. After looking around I found that those door speakers are controlled by a factory amp. I took his radio out, and low and behold his blue/white was hooked up to the two blue remotes for the aftermarket amps, but there was another blue wire coming from the harness that was not hooked up.

So I hooked up all three amp remotes to the blue/white wire, plugged the radio back up, and hooked up the battery. Turned the key and the radio didn't come on. Took the radio back out hooked red and yellow directly to 12v+ and the ground directly to ground, all without the harness and got nothing. Feeling like I made a mistake or maybe he jammed the radio too hard on the install, I went and got a Sony Xplod that I had sitting around.

Hooked the sony up only with red, yellow, and black. The Saony came on and worked fine. So I proceeded to take the cage off the Alpine, and wire the GM harness to the Sony harness. Figuring that the blue wires needed to be hooked up, I hooked them all to blue/white. Wired the harness like normal. Plugged the three sets of RCA's up and put the radio in and the dash back in place.

I was so sure it would just turn on. Well it didn't. Took it back out, and hooked it up directly to power and ground (fused of course) and still nada. So I gave up for the night.

I feel really bad about the Alpine (CDA-7897) but the Sony(cdx-5700) was just an extra radio.

I took the Sony apart today. Everything that should get power, is. T%here is no visible burnt areas and no smell. Nothing I can see is burnt up. The only other thing I can think of is maybe a burnt out chip or resistor. It is a total PITA.

I have never broke a radio on an install and worse yet it wasn't mine.

I think the shop that last did my friends truck did some voodoo stuff to the factory amp. Yet the wire is giving no power and does not seem to have continuity to ground. Now with both the Sony and the Alpine, the blue white wire is getting its proper 12V. So the amps still come on. The only thing I can think of- is that the factory blue wire was a booby trap. I mean what else killed both radios??

So with all that said. I know what I can do to get the speakers in the truck working (directly wire them up to amp) but what of these two nice radios??

Do I throw them away?

Has anyone else have a radio die from getting either power or ground from the blue/White wire?? Would not a fuse have blown?

Does anyone have a skematic for either radio?? I just don't know what to do and I feel bad I burned out my friends radio, even though I wired it correctly.

I have been going nuts all day.

Thanks in advance for any help, suggestions or like stories.

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[nolazach]

Anyone???

What I have is a dead Alpine and a dead Sony.

Is there any skematics or trouble shooting guides for these models??

I am getting power all over on the circuit board. I am even getting low voltage to the face-plate. Neither radio is turning on. Neither mad a pop, blew a fuse or smells or looks burnt up. I have never seen anything like this.

I know most people skip over long posts, but please I need a person who knows his stuff to help me trouble shoot this.

 

[Stoke]

Search with yahoo or google or something and try and find the manual to either radio....usually have them on the manufacturer's website.

 

[nolazach]

got both manuals, need to know the real nuts and bolts. Like what resistors are where, I think I may need to get a chip replaced or throw the radios away and hit up Ebay.

 

[Stoke]

Oh, maybe the manufacturer's websites have the schematics?

 

[nolazach]

Naw it would be to nice of them to provide that info.

What I really need to know is if there is an individual componet I could replace to get it to come back on. Just screwy that both radios did the same thing.