No audio output, left side
Thread Starter
Newbie
Joined: Aug 2003
Posts: 21
Likes: 0
From: N. Alabama
No audio output, left side
Here's probably a real simple one for you experts: Recently lost audio on the drivers side. When using the BAL control, the audio decreases to almost to nothing when going all the way to the left. Right side seems normal. Fader sounds scratchy in left side speakers also. Pulled the rear deck speaker grille and the left side speaker magnet seems much warmer than the right. Do not want to upgrade, just want to restore to normal. Can one blown/bad speaker take out one side of the stereo? Where is the most logical place to start? Thanks; Don
1993 190E, No CD Player, Just Cassette
1993 190E, No CD Player, Just Cassette
Super Member
Joined: Jan 2004
Posts: 538
Likes: 2
From: Silicon valley
Audi C7.5 S6
Does the radio have front/rear fader & R/L balance, four power amp outputs?
If so, then one channel of the amplifier outputs may may be blown.
Measure the impedance of the ( four? ) speakers, should be around 4-8 ohms each.
Disconnect the head unit from the harness, measure the speaker wires at the back of the head unit, should be similar impedance as the (four?) speakers.
IF your radio does not have an auxillary amplifier, then it would be the output IC in the head unit (this may be a two or four channel amplifier IC). Most likely the silicone grease to the heat sink is dried out.
Check each channel speaker output at the head amp, with a known good speaker, if one channel is dead, it's the head unit. just replace the IC.
One of these may be the Headunit pinout
http://www.budget.net/~sura/radio_pin_outs.pdf
or
http://www.beckerautosound.com/1492.html
If so, then one channel of the amplifier outputs may may be blown.
Measure the impedance of the ( four? ) speakers, should be around 4-8 ohms each.
Disconnect the head unit from the harness, measure the speaker wires at the back of the head unit, should be similar impedance as the (four?) speakers.
IF your radio does not have an auxillary amplifier, then it would be the output IC in the head unit (this may be a two or four channel amplifier IC). Most likely the silicone grease to the heat sink is dried out.
Check each channel speaker output at the head amp, with a known good speaker, if one channel is dead, it's the head unit. just replace the IC.
One of these may be the Headunit pinout
http://www.budget.net/~sura/radio_pin_outs.pdf
or
http://www.beckerautosound.com/1492.html
Last edited by m444; Mar 30, 2004 at 11:25 PM.
