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SAMSUNG PS-50Q96HDXXEU PSU BN44-00162A Dead and blowing fuse

Discussion in 'Troubleshooting and Repair' started by JayJay, Jan 14, 2019.

  1. JayJay

    JayJay

    1
    0
    Jan 14, 2019
    Hello and New Years Greetings!

    This is my first post and I hope its in the right place

    I've been given this heavy 50" LCD TV which had previously been repaired (Im told) and has died again

    Upon inspecting the PSU board I realised the two MOSFETS 'FQPF9N50C' were shattered

    The fuse F801S was also blown

    I've replaced the two MOSFETS and the fuse but the issue is the same fuse keeps blowing

    I've checked the bridge rectifier and other diodes on the hot side but cannot find a short

    Any help where to check would be appreciated

    thanks

    Jay
     

    Attached Files:

  2. Tha fios agaibh

    Tha fios agaibh

    1,906
    600
    Aug 11, 2014
    You need to isolate downstream loads to try and find what's overloading it.
    I would start by disconnecting the secondary side of transformer and see if you still blow fuses.
    If so, it may have shorted windings.
    If not, measure it's output and start looking for something on the secondary side. Check zeners and caps but don't power circuit with them removed.

    Divide and conquer.
     
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