Vx42l lcd tv

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Airsooner
    New Member
    • Jul 2014
    • 3
    • United States
    #1

    Vx42l lcd tv

    Hi, I am working on my 42 inch LCD TV. My daughter plugged a computer into one of the USB ports and the TV shut off. It will not power on at all now no backlight, no amber light wont do anything. I replaced the power supply thinking this was the issue without properly troubleshooting my mistake. The power supply did not fix the issue. I found your site and I have performed some troubleshooting. I have the 5V SB but I am not getting the 12V or 24V from the power supply the fuse is good on the PS. I unplugged the power supply from the inverter board and still no 12V or 24V. I checked the fuses on the main board and I am getting 5V. I checked U33 and I am not getting anything on Pin 1 or Pin 2. I cannot read any of the voltages on any of the regulators. I was going to just buy a new main board but would like to try and repair this myself it sounds like from what I have read here it that the main board could definately be the issue. I would appreciate if I could get some feedback on what to further check and how. I will get some picutres of the main if you need them. I am exctied to get this bab
    y running again with component level troubleshooting. Any suggestions and feedback would be much appriciatted.
    Tags: None
    • mscserbia
      Member
      • Dec 2013
      • 17
      • Serbia
      #2
      Re: Vx42l lcd tv

      Post some pictures of psu and main board.
      Measure voltage on PS-ON and see if the main board sends a signal to activate the power.
      Last edited by mscserbia; 07-13-2014, 06:33 AM.

        Comment

        • martino
          Not so "senior"
          • Aug 2013
          • 997
          • canada
          #3
          Re: Vx42l lcd tv

          mainboard provided 5.5volt to the usb ports,the computer does that also.I would suspect that when the computer got plugged in that there was a 5volt conflict.
          12 and 24 volts only come up when the mainboard turns on the power supply...
          Some closeup pictures of the mainboard would help.I'd say suspect area would be between the 5volt line coming into the mainboard and the 5volt feed to usb ports...
          Proud owner of dozens of broken TV's and many,many,many boards.


          Our website and passion:http://hollenhundshepherds.com/

            Comment

            • Airsooner
              New Member
              • Jul 2014
              • 3
              • United States
              #4
              Re: Vx42l lcd tv

              Ok no problem thanks for the reply I will get some pictures of the Main board and Power supply posted as soon as I can. In the mean time I will check the PS-ON and will report back thanks.

                Comment

                Previous template Next

                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...
                  ORIGINAL POWER SUPPLY BOARD
                  7 Photos
                  11-22-2024, 01:46 PM
                • jb_Bak
                  Sony xbr-65x900c main board issues?
                  by jb_Bak
                  Hey guys great forum glad to have found it. I bought a Sony XBR 65X900C cheaply because it didn't work. No signs of life at all not even a light/led. All I hear is a brief high voltage sound when I throw the power to it.

                  Didn't see any obvious signs of damage so right away started checking voltages. This is what I see:
                  Power Board Connector that goes to Main board
                  CN6401
                  Pin 01 NC
                  Pin 02 NC
                  Pin 03 "BL_ON": 0V
                  Pin 04 "N/C"
                  Pin 05 "STBY 3.3V": 3.5V
                  Pin 06 "GND": N/C
                  Pin 07 "AC_OFF"...
                  09-27-2021, 04:52 PM
                • JDC
                  (SOLVED) - ONN 100012588 No Power, Then Rebooting After Main Board Change
                  by JDC
                  ONN 100012588
                  Issue: No Power, Then Rebooting After Main Board Change

                  Short answer: replace main board and power board
                  Technical answer: replace main board and Q306 & Q307 on power board.

                  Long answer:

                  TV wouldn't turn on. Power switch was fine which means the main board isn't processing the power on signal. Replaced main board. TV turns on now but randomly reboots. Bad main board? EEPROM? Tried to pull main board and got a shock touching the corner of the board. That's weird. C334 (450V 10uf) capacitor is still holding a high charge....
                  07-15-2022, 07:39 AM
                • cheeky2
                  Is it possible to upgrade from a Vestel 17MB97 main board to a 17MB110 Main board?
                  by cheeky2
                  I suppose the real question is whether the existing pinouts from ether a 17IPS71 psu are cross compatible with a 17IPS12 psu? If they are then the exchange of the main boards should have no issues providing the screen is compatible with both main boards. Obviously you can change the screen configurations easily enough (providing you have the correct files) for the main board. Why may you ask would I do this? Well a lot of the smart features are no longer working on a Hitachi 48HBT62U main board I wish to give it a new lease of life!
                  Obviously the same LVDS connector for the screen connection...
                  05-25-2024, 03:27 AM
                • Asraf Atb
                  Help Needed: Samsung UE55MU8000 Dead - Possible Main Board Issue
                  by Asraf Atb
                  Hi everyone,

                  Im looking for some advice regarding my Samsung UE55MU8000 TV with main board model BN94-11606C. The TV suddenly stopped turning on and now shows no signs of life at all not even the standby light at the bottom.

                  Initially, I suspected an issue with the PSU, so I took it to a repair center. They tested it and confirmed that the PSU works perfectly, even on other TVs. Based on that, I started investigating the main board.

                  I disconnected the main board from the PSU, and the backlight turned on, which seems to confirm the main board is the issue....
                  1 Photo
                  01-27-2025, 05:02 PM
                • Loading...
                • No more items.
                Working...