Question about Audio & Video Receivers

1 Answer

No power to head unit - Audio & Video Receivers

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers
Re: No power to head unit


Posted on Feb 13, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Unit has power and lights up. None of the buttons work and cd wont eject. The CD eject button turns the unit off but won't eject the CD. Cannot change the functions. Have reset the unit and checked th

Remove the face plate and clean the contacts on both the head and the radio. It sounds like a bad connection, The base and head use serial data to talk to each other(control).If one of these connections are bad the unit will not work properly.

Oct 06, 2014 | Sony MEX-BT2900 Bluetooth Car Stereo with...

1 Answer

How do I reset a technics sa-gx350 receiver unit

Don't know that you can actually reset this unit like the new digital receivers. It does have protection circuitry that will shut the unit down in case speaker wires are shorted or if speaker impedance is less than the indicated rated impedance of the amp. do the following:
1. Turn off power and unplug from wall.
2. Check all connections and correct if needed.
3. Turn back on after 1-2 minutes.
If unit is still in protect mode you may want to unplug everything from the unit and then power back up to see if the problem is internal or external. If it powers up correctly then the problem is external. Power back down and plug in one external item at a time and power back up between connecting each item to see which item causes the receiver to go into protection mode.
If problem seems to be internal I'd recommend taking to an electronics repair shop if you aren't comfortable with taking apart to check fuses, terminations, etc. There may be a 5-amp fuse in the power plug head also.

Oct 21, 2013 | Audio & Video Receivers

1 Answer

My DEHp8400bh only connects to my htc evo4g sometimes and other times it reads no service. please help

I've found that I need to have my phone on with Bluetooth enabled before the head unit powers on (i.e.starting the car). If it's already started I just pop the faceplate and snap it back in to power cycle the head unit. At that point Bluetooth always connects properly.

Dec 07, 2012 | Pioneer Deh-p8400bh Cd/mp3/ Receiver W/...

1 Answer

Ground wire was hooked up to a power wire...

My guess is it blew the power supply. Best bet would be to have a repair shop have a look.

May 04, 2009 | Audio & Video Receivers

1 Answer

My car amp works produces distorded noise . As I plug in the rca cables i noticed that if just the tip of the connector touches i get a good sound but if i insert the whole connector it becomes distorded...

You have a grounding issue.

The RCA inputs of the amp are many times NOT tied to chassis ( the chassis of the car ) ground.

Same goes for the RCA outputs of your head unit.

The speaker outputs of your amp SHOULD NOT EVER be tied to chassis ground.

  • make sure that no speaker wire from the amplifier is touching or attached to ground.
  • Make sure that your amplifier ground (GND )( of the 3 power inputs.....GND, +12V, Rem) is securely mounted to a bare metal spot on the frame. Best practice is to have the amp GND, and the head unit GND at the exact same physical point.
  • Make sure that your RCA cable shield ( not the center tip, but the part around it ) is not touching the chassis.
  • Make sure that you have not nicked the wire while installing it and are accidentally getting a connection to the frame of the car.
  • Make sure that the head unit is grounded properly.
  • IF for some reason you have an equalizer between the head unit and the amplifier, make sure it has its own switching power supply INSIDE the EQ.
Bad grounds are a pain to of luck....Rob

Mar 17, 2008 | Audio & Video Receivers

1 Answer

How do i install a subwoofer and amplifier to an exhisting car audio system


The basic would be to wire the sub amp to your batteries with the trigger/remote wire powered by your car stereo/head unit. When your head unit is turned on it will in turn power up the sub amp. Of course the sub woofer need to be wired to the amp. For the signal/audio wiring, normally, the head unit has a stereo RCA female connectors at the rear intended to be connected to external amps through a pair of shielded/audio cable terminated both ends with RCA males. Some units have a special RCA specifically for subs. Most eternal amps also uses RCA for their inputs.

If the existing car audio system has already an external amp and your plan is to add on to this, the audio/signal from the head unit could be split to provide both for the existing and the new sub amp.

If the existing car audio does not have an external amp and their are no RCA connectors at the rear of the head unit, it is still possible to connect an external/add on amp by using an adapter that connects to the speaker wires of the head unit and converting it out to line level (through RCAs) appropriate for the input of the amp.

Hope this be of help/idea. Pls post back how things turned up or should you need additional information. it would also be nice if you can post brand/model of your head unit and intended sub amp.

Good luck and kind regards.

Jan 23, 2008 | Audio & Video Receivers

1 Answer

I have it all connected but it still wont work and there is power going through the ground wire on my amp for my car

Good question BUT, not much information to go on. "Won't Work" is a bit generic so how about asking if the head unit's display works? Do you have an additional amp connected? Does the amp power up? Does the head unit accept and play CDs? Does the radio tune?

Please "fill in the answers" and we'll go from there.
Thanks for your question

Jan 19, 2008 | Audio & Video Receivers

Not finding what you are looking for?
Audio & Video Receivers Logo

Related Topics:

361 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audio & Video Receivers Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers


Level 3 Expert

6993 Answers

The Knight
The Knight

Level 3 Expert

66444 Answers

Are you an Audio and Video Receiver Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides