1. VresiBerba

    OP VresiBerba Member
    Member

    Joined:
    Dec 2, 2005
    Messages:
    25
    The internal speaker works, measures 8Ω, crackles when fiddling with audio lines and there's audio out through the headphone jack; I can hear the amp is running due to the slight noise as well as popping when dis/connected. There's actually some game audio coming through the head phone jack; you can just make out the 'bading' boot sound, but it's nearly inaudible. Presumably this also goes out though the speaker.

    I have gone over all traces, re-flowed all solder joints, checked continuity and everything looks fine - except there's no game audio. The headphone board is currently removed, and it made no difference. I know there's a switch in it that turns the internal speaker on and off, but it seems to be working and the problem affects both outputs anyhow. The volume pot also seems to be okay as it measures different on varied input. The game cartridge works fine in another system. I'm completely stumped.

    20201125_020453.jpg
     
    Last edited by VresiBerba, Nov 25, 2020
  2. ChiefReginod

    ChiefReginod GBAtemp Regular
    Member

    Joined:
    Jun 11, 2016
    Messages:
    218
    Country:
    United States
    All signs point to bad capacitors. This is a common issue with a lot of older audio devices. It also happens to Game Gear and Turbo Express systems.
     
  3. masenko

    masenko GBAtemp Regular
    Member

    Joined:
    Jul 24, 2007
    Messages:
    132
    Country:
    United Kingdom
    could be faulty headphone jack. when you plugin headphones it cuts the audio to the speaker, could be stuck in this mode.
     
    Last edited by masenko, Nov 25, 2020
Draft saved Draft deleted
Loading...

Hide similar threads Similar threads with keywords - Original, audio,