BN44-00259A in a Samsung

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • diif
    Badcaps Legend
    • Feb 2014
    • 6978
    • England

    #1

    BN44-00259A in a Samsung

    This TV has had a previous repair that has not worked.
    Capacitor CP810, the bridge rectifier and the fuse were damaged and the mosfet and FAN7530 were replaced out of caution.
    The new bridge rectifier is a RS450M and the mosfet a 8N60C.

    I have 340V across the main capacitor CP815, which doesn't seem right ? and there are no voltages on connector CNM802. Testing voltages on UM801S there is 340v on the drain but 0v on VCC.
    I've checked all of the diodes and mosfets but I'm clearly missing something obvious and hope someone can point me in the right direction.
    Attached Files
  • R_J
    Badcaps Legend
    • Jun 2012
    • 9528
    • Canada

    #2
    Re: BN44-00259A in a Samsung

    What does'nt seem right about 340v on the main cap? That should be normal without the pfc working. Is the fuse FM802A good? UM801s is the standby ic that needs to be working before you will have any other voltages
    Last edited by R_J; 05-12-2020, 01:55 PM.

    Comment

    • diif
      Badcaps Legend
      • Feb 2014
      • 6978
      • England

      #3
      Re: BN44-00259A in a Samsung

      I was expecting it to be higher or lower, or perhaps i'm just over thinking things..
      Yes the fuse is good, I guess i need to track down the missing VCC for UM801S.

      Comment

      • R_J
        Badcaps Legend
        • Jun 2012
        • 9528
        • Canada

        #4
        Re: BN44-00259A in a Samsung

        The ic provides its own vcc for startup (startup cell), I would check RM869 and see if it is open, I suspect the ic is bad. Once the ic is working, it's sustain vcc comes from TM801s (pin5) via RM890 & DM802,DM803. and charges CM804 which also supplies vcc to the other ic's via QB801
        I would replace CM808 and CM804 as they are likely bad or on there way out
        Last edited by R_J; 05-12-2020, 02:32 PM.

        Comment

        • diif
          Badcaps Legend
          • Feb 2014
          • 6978
          • England

          #5
          Re: BN44-00259A in a Samsung

          Thanks very much R_J, the resistor is ok, I've ordered the IC and caps, they should be here in a couple of days.

          Comment

          Related Topics

          Collapse

          • Document Archive
            Samsung Galaxy Book 2 Notebook Specification for Upgrade or Repair
            by Document Archive
            This specification for the Samsung Galaxy Book 2 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Galaxy Book 2 boardview and Galaxy Book 2 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, or download...
            09-07-2024, 05:50 AM
          • Document Archive
            Samsung Galaxy Book Ion NP930XCJ Notebook Specification for Upgrade or Repair
            by Document Archive
            This specification for the Samsung Galaxy Book Ion NP930XCJ Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP930XCJ boardview and NP930XCJ 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, or download...
            09-06-2024, 11:40 PM
          • Document Archive
            Samsung Galaxy Book Ion NP950XCJ Notebook Specification for Upgrade or Repair
            by Document Archive
            This specification for the Samsung Galaxy Book Ion NP950XCJ Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP950XCJ boardview and NP950XCJ 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, or download...
            09-06-2024, 11:40 PM
          • Document Archive
            Samsung Galaxy Book Ion NP950XCJ Notebook Specification for Upgrade or Repair
            by Document Archive
            This specification for the Samsung Galaxy Book Ion NP950XCJ Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP950XCJ boardview and NP950XCJ 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, or download...
            09-06-2024, 08:40 PM
          • Document Archive
            Samsung Galaxy Book Flex NP950QCG-K01DE Notebook Specification for Upgrade or Repair
            by Document Archive
            This specification for the Samsung Galaxy Book Flex NP950QCG-K01DE Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the NP950QCG-K01DE boardview and NP950QCG-K01DE 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,...
            09-06-2024, 06:20 PM
          • Loading...
          • No more items.
          Working...