bought new Power Board, can't test Main Board - need help using MultiMeters

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • GR3Y5H3ART
    Senior Member
    • Jan 2011
    • 146

    #61
    Re: bought new Power Board, can't test Main Board - need help using MultiMeters

    lastly, my new 2nd hald of Dual Screen monitor upgrade from a 27" ViewSonic
    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
    • ygorsan
      LG 55NANO77SRA TV – Menu scrolling by itself even after removing button board (Main Board EBU66792103)
      by ygorsan
      Hi everyone,




      I’m looking for help with a persistent issue on an LG TV model 55NANO77SRA, which uses the main board EBU66792103 (also used in LG UQ80 and NANO75/NANO80 series).







      🧩 Problem Summary:
      • The TV keeps scrolling through the menu or selecting items by itself.
      • I removed the physical button board (the entire panel with power and volume buttons) and also disconnected the flat cable (CN202) from the main board.
      • The remote control is not in use (batteries removed), and the TV still shows the same behavior.
      • I
      ...
      07-28-2025, 08:34 AM
    • 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....
      01-27-2025, 05:02 PM
    • Loading...
    • No more items.
    Working...