Pioneer mini stereo - audio issue

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • notallbad
    Badcaps Legend
    • Oct 2012
    • 1190
    • UK

    #1

    Pioneer mini stereo - audio issue

    Everything appears to work as it should except for sound.
    Theres no sound coming out of the speakers but can just vaguely hear sound through the headphones with the volume turned almost up to its maximum. Tested with cd in cd player, mp3 music file on usb stick, radio station tuned in - same result!

    Headphone jack ok, hp-detect shorted with headphones unplugged and open cct when plugged in.

    Meter shows short circuit between the l + r speaker outputs.

    TAS5719 Digital audio power amplifier chip on mainboard.

    Power supply board voltages all appear to be correct.

    Would my assumption/checks so far indicate that the TAS5719 needs replacing?
  • notallbad
    Badcaps Legend
    • Oct 2012
    • 1190
    • UK

    #2
    Re: Pioneer mini stereo - audio issue

    As well as all speaker outputs shorted they are also shorted to gnd.

    Comment

    • notallbad
      Badcaps Legend
      • Oct 2012
      • 1190
      • UK

      #3
      Re: Pioneer mini stereo - audio issue

      Voltages on TAS5719 appear reasonable , 3.3v and 22v etc and the internally generated 1.8v.

      Removed the 4 inductors and the short between speaker outputs has gone.

      Would seem that the TAS5719 has pins OUT-A , B, C & D shorted.
      And BST_D and OUT_D has a low resistance reading of 7 ohms.
      Last edited by notallbad; 02-24-2021, 06:41 PM.

      Comment

      • momaka
        master hoarder
        • May 2008
        • 12170
        • Bulgaria

        #4
        Re: Pioneer mini stereo - audio issue

        Ah, it's one of those class-D ICs with digital inputs. In that case, it's hard to say what exactly is going on. It could be that the IC is working, but due to lack of or improper input signal clock(s), the outputs are placed in a low-impedance state to ground. But it could also be that the IC has shorted outputs and going into protection mode... in which case, perhaps it should be relying that data back through the I2C bus to indicate a fault... but then again, that may or may not be implemented with whatever IC the TAS5719 is connected with.

        That said, from what I see in the datasheet on pages 20 and 21 for protections, pretty much any fault will place the H-bridge outputs for the speakers in a high-impedance state, meaning both upper and lower FETs in the H-bridge should be open... therefore, the short-circuit you see to ground does sound problematic. Of course, I'm assuming you did that resistance measurement with the power off (don't mean to undermine your troubleshooting skills in any way, but just want to verify my assumption is correct.)

        Other than that, I can't really give you much useful help here. If the TAS57819 is readily available and cheap, probably may be worth to try and replace it to save some time on troubleshooting (unless you don't mind that and really want to find out what the problem is.) With all those digital inputs, I really don't see how one could go about correctly testing this.

        Comment

        Related Topics

        Collapse

        • momaka
          RCA WHP141 wireless headphones wired up
          by momaka
          OK, this one dates back to 2015! I thought I had posted this, but realized I didn’t when I posted a picture of something else. So here it goes…

          Back in 2015, I bought a pair of RCA WHP141 wireless headphones at Micro Center for $2. I even mentioned it in the best cheap/free scores thread right here. Just forgot to follow up with that.

          As mentioned back then, these are (were) 900 MHz FM wireless headphones. No modern day Blutooth or anything like that. I knew they wouldn’t be great headphones or even that good… but the price was right! So let’s take...
          02-22-2023, 06:28 PM
        • Document Archive
          HP 260 G2 Desktop Mini PC i3-6100U Specification for Upgrade or Repair
          by Document Archive
          This specification for the HP 260 G2 Desktop Mini PC can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the 260 G2 Desktop Mini PC boardview and 260 G2 Desktop Mini PC schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet,...
          09-12-2024, 03:36 PM
        • Document Archive
          HP Stolní počítač 260 G3 Mini i5-7200U Specification for Upgrade or Repair
          by Document Archive
          This specification for the HP Stolní počítač 260 G3 Mini can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the Stolní počítač 260 G3 Mini boardview and Stolní počítač 260 G3 Mini schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer...
          09-12-2024, 02:20 PM
        • Document Archive
          HP 260 G2 Desktop Mini PC i3-6100U Specification for Upgrade or Repair
          by Document Archive
          This specification for the HP 260 G2 Desktop Mini PC can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the 260 G2 Desktop Mini PC boardview and 260 G2 Desktop Mini PC schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet,...
          09-12-2024, 02:15 PM
        • Document Archive
          HP 260 G2 Desktop Mini PC i5-6200U Specification for Upgrade or Repair
          by Document Archive
          This specification for the HP 260 G2 Desktop Mini PC can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the 260 G2 Desktop Mini PC boardview and 260 G2 Desktop Mini PC schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet,...
          09-12-2024, 02:15 PM
        • Loading...
        • No more items.
        Working...