Announcement

Collapse
No announcement yet.

Samsung LN52A630M1FXZC that does not have standby light and will not power on

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Samsung LN52A630M1FXZC that does not have standby light and will not power on

    I have a Samsung LN52A630M1FXZC that does not have standby light and will not power on. This uses the BN44-00201A power supply board.
    I ordered the repair kit for this board from ShopJimmy and installed the following.
    QP801, QP802, DP802, ICM801, CM851, CM852, CM854, CM855, CM856, CM858.
    FS801, FI801 tested good.
    When I applied power the TV came to life and all was good for about 5 minutes.
    Then there was a loud snap and it went off.
    No burning smell, but under close inspection I found CM814 (470pf 1KV) to be split open, and FI801 to be blown.
    I have power to the rectifier, but no voltage to CN801. My electronics skills are limited.
    Any ideas on a path forward?
    Attached Files

    #2
    Re: Samsung LN52A630M1FXZC that does not have standby light and will not power on

    You are sure you didn't get any parts in backwards?

    Comment


      #3
      Re: Samsung LN52A630M1FXZC that does not have standby light and will not power on

      I've checked several times and verified that I installed the components the same way the original parts were installed. The banding side of capacitors lines up with the marks on the circuit board.

      Comment


        #4
        Re: Samsung LN52A630M1FXZC that does not have standby light and will not power on

        CM814 (470pF) is the snubber cap (these cap will shorted out when they go bad, it is commonly failed cap, it should be replaced with 2KV rating instead) for the MOSFET QM803 so you need to check the resistance of the Source resistor RM834 to see if it is blown open circuit or not, it should be <1 Ohm.
        See schematic attached.
        Attached Files
        Last edited by budm; 12-04-2019, 02:26 PM.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment


          #5
          Re: Samsung LN52A630M1FXZC that does not have standby light and will not power on

          I checked the in circuit resistance of RM834 and it is approx 0.5 ohm.

          Comment


            #6
            Re: Samsung LN52A630M1FXZC that does not have standby light and will not power on

            I checked the in circuit resistance of RM834 and it is approx 0.5 ohm.

            Comment

            Working...
            X