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Yamaha RX-V483 dead.

Discussion in 'Audio' started by ponteley, May 19, 2020.

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  1. ponteley

    ponteley

    6
    0
    Feb 7, 2020
    Yamaha RX-V483 dead. No 5.5V on secondary.
    Tested all fuses, diodes, transistors and caps.
    Unsoldered transformer, - seems to ring trough on all coils. Fuses are OK. Primary DC voltage 160V.
     
  2. ponteley

    ponteley

    6
    0
    Feb 7, 2020
    PSX_20200519_143015.jpg PSX_20200519_142719.jpg
     
  3. ponteley

    ponteley

    6
    0
    Feb 7, 2020
    3A453.JPG

    I suspect 3A453 IC, but I can't find replacement anywhere.
    Please help.

    Thank you.
     
  4. PETERDECO

    PETERDECO

    58
    12
    Dec 19, 2019
    The STR3A153 is readily available and has the same pinout and similar spec's. If it is the trouble, it might be the only way to save the amp.
     
  5. Alec_t

    Alec_t

    2,844
    760
    Jul 7, 2015
    Does the relay pull in?
    The board is discoloured below the big primary cap, suggesting overheating. Did you measure the ESR of that cap?
     
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