Lc-42sv49u has stand by voltage and that's all

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Josephmichael09
    New Member
    • Oct 2014
    • 8
    • United States
    #1

    Lc-42sv49u has stand by voltage and that's all

    When plugged in the stand by led turns on. When I try to power on the tv, the led turns off and remains off. Nothing happens.

    From the power supply there are 3 connectors. Two go to the main board and the other to the power inverter.
    I was takin measurements from one of the connectors the go to the main board. The colors on the connector are black, red, orange, brown, yellow, and green.

    With the power cord connected the only voltage u get is 5.2v coming from the orange pin(which I believe to be stand by voltage). When I press the power button, the stand by voltage fluctuates then returns to 5.2 volts. There is still no voltage at the other pins and the stand by voltage does not drop to zero.

    The caps look ok. I am going to change them either way but, are there any suggestions as to what's wrong?
    Tags: None
    • Josephmichael09
      New Member
      • Oct 2014
      • 8
      • United States
      #2
      Re: Lc-42sv49u has stand by voltage and that's all

      Correction: the 5v does not fluctuate. I guess it's was just my hand wobbling over the pins with the test leads
      Attached Files
      Last edited by Josephmichael09; 10-07-2014, 08:22 PM.

        Comment

        Previous template Next

        Related Topics

        Collapse
        • DXseekerMO
          Vizio E400i-B2 missing stand-by voltage
          by DXseekerMO
          I picked up this Vizio E400i-B2 with no stand-by light and diagnosed it with missing stand-by voltage. I found a Power Supply at ShopJimmy, installed it but it didn't work properly. SJ refunded the transaction and did not ask me to send the board back.

          So I took some voltage readings upon the original board. Here's what I found:

          Main caps have 169.9v

          AC detect voltage is 1.3v

          None of the MOSFETS appear to be short.

          The opto (IC106) that appears to have something to do with stand-by voltage has 3.0 volts on terminal 1...
          10-30-2021, 10:19 PM
        • 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...
          ORIGINAL POWER SUPPLY BOARD
          7 Photos
          11-22-2024, 01:46 PM
        • Fernon@Repair
          Gigabyte Z490 Gaming X Motherboard No VCORE Voltage
          by Fernon@Repair
          i have Gigabyte Z490 Gaming X Motherboard .it has a power on no display fault .. no vcore voltage and debug led stuck CPU LED .

          VCCIO voltage ok
          VCCSA Voltage OK
          VCCPLL Voltage OK
          Ram Voltage ok
          RamVTT OK
          VPP 2.5 OK

          But No Core Voltage

          and i want to this vrm ic datasheet or pinout (ISL69269)
          anyone have this ic pinout voltages?...
          06-25-2025, 07:19 AM
        • electron_jj
          Panasonic TH-L42D25A checking the PSU output voltage
          by electron_jj
          Hi Everyone, I am new to this forum. I have a Panasonic LED TV which doesnt turn on and is blinking 4 times repeatedly when I turn on the switch. The TV does not respond to the remote control so I had to turn on using the physical switch on the side of the TV. When I turn on the switch the 4 x blinking starts and repeat itself until I turn off the TV. There is a black screen. I turned off the light in the room to check the panel and I think there is no backlight as far as I can tell.

          I have been inspecting and testing the capacitors and diodes in the power supply board to try to...
          08-29-2021, 08:13 AM
        • sam_sam_sam
          Trip light 2400 watt line conditioner bought used issue with low voltage oscillation going on between relays
          by sam_sam_sam
          I found two capacitors on the board and one of the leads on one capacitor had bad soldering joint and the other joint connections not much better and there were several soldering joints that way to much flux around the joint redid several of them

          The capacitors were a non brand that I did not recognize they got replaced and now it does not oscillating between relay but what concerns me a little bit is when the voltage is a little bit low the output voltage is around 130 volts and then drops down to 115 volts this happens around 105 to 108 volts if remember correctly

          Now...
          06-09-2024, 10:57 AM
        • Loading...
        • No more items.
        Working...