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DEH-P8400MP unit is dead & un responsive. power to unit has been checked along with ground. OEM equipment replaced & operates faultlessly with same power supplies

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SOURCE: Stopped working

I had a similar problem with a jvc 8040. when I replaced the fuse it became very obvious that the b1560 output on the center channel was blown (smoke and sparks, always a dead giveaway). I haven't fixed the center channel yet but simply unplugged the center channel board and removed it from the unit. Now everything works fine except of course the center channel. Pre outs still operate just fine so a slave amp could be used for center channel power, or you could just go and buy a marantz amp; I did and then I realized that I was lucky that the old jvc quit.

Posted on Jan 30, 2008

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The 16 pin from receiver diogram


Hello Lon Delaney,

I'm not actually seeing a question here... Nor make/model/year...

but I can easily deduce you are in wonderment how to meld these many wires... with your existing world (I suspect).

if you do NOT own your own drawings... (which I strongly recommend to anyone who is going to keep a vehicle for a while)... you can (highly likely) access some quite EXGUISITE drawings at BBB Industries web site. EULA (end user licensing agreements) need be settled (as with everything technical in todays world)... but their technical drawings & service bulletins are very well worth the exposure...

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The AFTER MARKET APPLIANCE manufactures... support some makes...but (car manufacturers are deliberately EMBEDDING proprietary wiring into increasingly complex systems)...

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Avail yourself of their expertise & custom equipment...
They were the ones that honestly told me my LINCOLN Navigator was a pretty ugly system... but I could indeed get a 3SIXTY3 unit to accomplish what I was after.

Good luck with yours.

See Crutchfield right here (below)...

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Hello
There only two reasons for this power fault to this set. Cehck them. If these two are altight, the set need service.
[1] The protection circutary has been activated:
Make sure that all the speaker wire connections on this unit and on all speakers are secure and that the wire for each connection does not touch anything other than its respective connection.
[2] This unit ahs been exposed to a strong external electric shock (such as lightning or strong static electricity): Set this unit to standby mode, disconnect the power cable, plug it back in after 60 seconds and then try to use it normally.
If these does not help you, get this set repaired by the Authorised Service Center for Yamaha at your town. OK.

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Signal cables have nothing to do with any discussion of a dead unit, especially fibre optic as they don't conduct electricity.

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

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Hi again,

You might have need for the following information:
Hope this be of additional help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

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Sound to headphones comes from the pre-amp stage of most units otherwise they wouldnt be able to handle the power output . 150 watts into your ears ouch lol .
So it sounds like your slave amp has gone down on one channel . a slave amp is the final output stage and the power stage to the speakers . to make sure it is the amp change your speakers over if the sound then works from the speakers that had been dead then its the amp and requires an engineer to check it out with the prospect of a new output IC or final stage / capacitor replacement

unskilled persons should not attempt to repair electronic equipment as it is unsafe to do so , and may cost you far more in the long run ?. Regards Vortash

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Stopped working


I had a similar problem with a jvc 8040. when I replaced the fuse it became very obvious that the b1560 output on the center channel was blown (smoke and sparks, always a dead giveaway). I haven't fixed the center channel yet but simply unplugged the center channel board and removed it from the unit. Now everything works fine except of course the center channel. Pre outs still operate just fine so a slave amp could be used for center channel power, or you could just go and buy a marantz amp; I did and then I realized that I was lucky that the old jvc quit.

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