led42c45rqd RCA TV NO POWER Resistor Identification

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • johns1mj
    Badcaps Veteran
    • May 2015
    • 242
    • United States

    #1

    led42c45rqd RCA TV NO POWER Resistor Identification

    I acquired a RCA 42" with no power. I found a resistor that appears damaged. I have tried to identify the resistor to no avail. Using digikey it gives me .25 ohms 5%. However I can not find one in their chart that matches exactly.
    How do I know the voltage?
    Where is another place to look?
    Digikey, ebay, amazon and RadioShack I didn't find them.
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: led42c45rqd RCA TV NO POWER Resistor Identification

    https://www.badcaps.net/forum/attach...9&d=1465436897
    That probably means that the Power MOSFET mounted on the heatsink to the right is probably shorted out and the IC that drive the MOSFET too. You should check all the devices mounted on the heatsinks
    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

    • johns1mj
      Badcaps Veteran
      • May 2015
      • 242
      • United States

      #3
      Re: led42c45rqd RCA TV NO POWER Resistor Identification

      It does appear c101 and q100 were soldered together from the factory.
      Attached Files

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: led42c45rqd RCA TV NO POWER Resistor Identification

        Originally posted by johns1mj
        It does appear c101 and q100 were soldered together from the factory.
        The cap is the Snubber cap for the MOSFET and it looks to be connected to Source and Drain pin, so does it show very low resistance between Source pin and Drain pin? You have to verify that there are no shorted parts on the board, resistor especially does not burn out with no reason, lots of current must have flown through that resistor for it to burn out.
        We need good clear straight shot of the whole bottom side of the power supply board.
        Last edited by budm; 06-08-2016, 08:37 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

        • johns1mj
          Badcaps Veteran
          • May 2015
          • 242
          • United States

          #5
          Re: led42c45rqd RCA TV NO POWER Resistor Identification

          here is the picture of the bottom
          Attached Files

          Comment

          Related Topics

          Collapse

          • Tynan Dill
            Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
            by Tynan Dill
            I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

            Upon bringing it home and plugging it up, it showed a standby light.

            I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

            The screen seems to blackout and stay black, but with a flashlight I can see the display.

            With my Playstation 4 connected via HDMI, and running a game I can hear sound.

            Assuming...
            11-22-2024, 01:46 PM
          • PantherDave
            Microsoft Surface Pro (5th gen) model 1796 - no power
            by PantherDave
            Hi all!

            I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅

            I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
            https://www.badcaps.net/forum/troubl...-hardware-devi...
            05-29-2024, 02:01 PM
          • GLISIT
            Asus Probook P5440UF-XB74 power issue
            by GLISIT
            Hi all,

            TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!


            I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!

            A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about...
            01-16-2025, 02:29 PM
          • jinu_j
            Dell 2209WA - power supply - Fusible Resistor replacement
            by jinu_j
            Hi

            I am trying to repair an ancient Dell 2209WA Monitor which suddenly shut off with a pop sound. On investigation found that one of the fusible resistors had blown. Further investigation identified multiple components as faulty because of which the fusible resistor blew. Please refer the attached circuit diagram showing the components that were found to be damaged.

            1. FR950 - blown fusible resistor - 0.2 Ohm 1W
            2. Q950 - shorted Q950 MOSFET - 650V 10A N Channel Mosfet
            3. R835 - Blown Resistor - 20KOhm SMD resistor
            4. D930 - Shorted Schottkey Diode...
            05-03-2025, 10:51 PM
          • sam_sam_sam
            Desoldering gun station modified to use a 18 volt @ 20 amp switching power supply
            by sam_sam_sam
            I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump

            One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
            03-31-2024, 02:12 PM
          • Loading...
          • No more items.
          Working...