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Hisense H49M3000 49" Smart TV - Burnt Zener Diode - Replace Diode or Circuit Board?

Discussion in 'Troubleshooting and Repair' started by CronaB, Nov 6, 2019.

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  1. CronaB

    CronaB

    1
    0
    Nov 6, 2019
    Hi all, was wondering if I could get some help with my Hisense 49” Smart TV. The backlight went on it a week ago so I opened it up to see if I could work out where the problem was coming from. I noticed there was a burnt out area on the circuit board around a component that I identified as a Zener Diode (pics below).

    http://prntscr.com/ptcm3m
    http://prntscr.com/ptcmhv

    I am hoping to fix it rather than buy a new TV, but I didn’t know whether it burnt out due to some other problem with the TV or due to the component itself malfunctioning. Is it worth just replacing the diode on its own or replacing the whole circuit board? Or even just buying a new TV???

    Thanks in advance for the help.
     
  2. 73's de Edd

    73's de Edd

    2,805
    1,176
    Aug 21, 2015
    Sir CronaB . . . . .

    Now THAT'S the type of problem / failure that one likes to see happening .
    However, that is NOT a zener diode but instead , being ONE of a set of 4 fast switching diodes that are on the output of that
    T901 transformer, located just below them.
    Take ohmmeter and check all 4 for being shorted . . .but expecting the heated one to be the prime suspect.
    Will be back if / when I find schema for that P/S unit.
    Confirm the alpha prefix marking for those XX 007 diodes, if its not being a UF4007.

    73's de Edd . . . . .

    Some sound advice . . . . . for . . .
    People who count on their fingers . . . they should maintain vocal silence, while additionally remaining discretely out of view.


    .
     
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