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might I have a bad tv mainboard or power supply board

Discussion in 'TV & Video' started by Ethan_the_axolotl, Feb 10, 2021.

  1. Ethan_the_axolotl

    Thread Starter

    hi i have a rca sld40a45rq 40 inch full hd tv it will only stay on for a few mins then shut off I cant open the menu as it will freeze and shut off (this tv does not have a warranty anymore and yes I'll never buy rca again)
    but I can bypass some of this problem by connecting it to my pc via hdmi but still cannot open the menu could I have some bad components on the power supply board or bad components on the main board and if so where should i start?
     



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  2. mikedt

    mikedt 你好

    Shutting down and freezing, I would start by checking for bad electrolytic caps on the PSU board and around the CPU. you'll need an ESR meter. Also check for bad solder joints on the PCBs.

    I believe RCA TVs are made by TCL, given that the RCA company doesn't actually exist any more. So even if you buy another brand it could still be made by TCL, given they're one of the world's largest OEMs of TVs.
     
    #2 mikedt, Feb 10, 2021
    Last edited: Feb 10, 2021
  3. Ethan_the_axolotl

    Thread Starter

    well I might just replace all the capacitors just to be on the safe side and if i need to ill replace some of the transistors
     
  4. Ethan_the_axolotl

    Thread Starter

    however I dont own one of these i can still check them with a cheap multimeter by using the resistance checking part and by setting it to 200k ohms (yes this method works)
     
  5. mikedt

    mikedt 你好

    I think that checks if a capacitor just open, short, or just leaky.
    https://en.wikipedia.org/wiki/ESR_meter
    A standard (DC) milliohmmeter or multimeter cannot be used to measure ESR, because a steady direct current cannot be passed through the capacitor.

    You can probably buy an ESR meter for around $50.
    https://www.amazon.com/s?k=esr+meter&ref=nb_sb_noss_2
     
  6. mikedt

    mikedt 你好

    Well you could, but it would take time and money. What you describe doesn't sound like a transistor fault, sounds very much like s bad electrolytic cap. From experience transistors either work, or they fail open, or short in various ways. Like if a switching transistor was short in the PSU, it would probably blow fuses.

    Do you have a good electronics store near you, or do you have to order components online?
     
  7. Ethan_the_axolotl

    Thread Starter

    ive got all kinds of components yesterday i replaced all the caps and well kinda works for a bit longer
     

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