Marshall Mg30fx power on but no sound, help!!

Discussion in 'Marshall Amps' started by Naipe139, Jul 9, 2019.

  1. Naipe139

    Naipe139 New Member

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    Hi everybody, Im New here so this is what happened...
    Inside my marshall Mg30fx the IC tda 2050 was bad because I tested and even in the speaker the multimeter show me 21 volts! So I changed the tda2050 for a New one and now in the speaker wires the voltage was 3 or 4 volts, so I check the transistor J111 and it was short circuited too, I changed it for a New one too and now the voltage in the speaker wires is 0 volts, thats COOL but, there is still no sound , I put the aux wire whit my phone or the guitar and there is no sound, also, a couple of resistors start to heat, is a couple actually 220 ohms I remember, is this normal,? Please help mee Im going craaazyyyyy :)

    One more thing, before I change the transistor and the IC when I touch the máster volume nothing happened, but now with the New ones sounds a little scratch, I dont want to power it because it cost me a lot of work search the IC and the transistor and changed them.
     
  2. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member VIP Member

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    I am sorry for your bad luck with your amp brother, I am not a tech, and can’t help you but I can welcome you to the Marshall forum, be patient, others with far more knowledge than I will be along to help you get it figured out!
    Cheers Mitch
     
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  3. BowerR64

    BowerR64 Well-Known Member

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    Ive had 3 with issues like this (not all 3 watt amps) and its always been the headphone jack not completing the circuit to the speaker. Spray into the jack (with de-oxit) and push in a maple jack a few times twisting it around and its good.
     
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  4. Naipe139

    Naipe139 New Member

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    Thanks bro, I really apreciate your welcome or any coment, I will try that and tell you whats up, cheers mate :band::dude::cheers:
     
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  5. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member VIP Member

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    Good luck brother, I hope that can give the amp it’s life back, the only problem I had with mine was that the OD channel quit working, and I never bothered to fix it!
    Cheers Mitch
     

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