TCL 55S451 Blank screen

Collapse
X
 
  • Time
  • Show
Clear All
new posts

  • x_orange90_x
    replied
    Re: TCL 55S451 Blank screen

    Originally posted by EazyBone
    I've had similar symptoms with this type of TV and it was the panel in fact. Panel shorts, turn screen on you get Backlight and sound but no picture. Google fixing TV with tape and try that, then you will rule out the panel. New boards won't fix it if it's the panel.
    Thanks for the reply. I have tried disconnecting each of the two panel ribbons separately which SHOULD show something like white screen, lines, half image, etc. but I still get the same backlit black screen. I found a thread on Roku forums of this exact issue with various brands and sizes of Roku TVs that apparently received a bad update and they acknowledged it.

    https://community.roku.com/t5/Discus...ay/td-p/830524

    I'm hoping it's not the panel because that would just suck. I'd expect to see SOMETHING on screen even if the panel was bad.

    The seller is sending me the correct board. Hopefully that will fix this ��
    Last edited by x_orange90_x; 10-27-2023, 06:49 AM.

    Leave a comment:


  • EazyBone
    replied
    Re: TCL 55S451 Blank screen

    I've had similar symptoms with this type of TV and it was the panel in fact. Panel shorts, turn screen on you get Backlight and sound but no picture. Google fixing TV with tape and try that, then you will rule out the panel. New boards won't fix it if it's the panel.

    Leave a comment:


  • x_orange90_x
    replied
    Re: TCL 55S451 Blank screen

    Here are pics of my original board and the New one, labeled New. I looked closely at the label on the panel in in the seller's pictures and compared it to mine. They are also different.

    My panel is:
    LVU550NDEL KS9W05 V1 40904-001534

    Seller's Panel is:
    LVU550NDEL CS9W95 V2 40904-002059

    Perhaps the main board I received ISN'T compatible with my V1 panel?
    Attached Files

    Leave a comment:


  • x_orange90_x
    started a topic TCL 55S451 Blank screen

    TCL 55S451 Blank screen

    I picked up a 55" TCL 55S451 last week that is not displaying any picture. When it powers on the screen lights up but there is absolutely no picture on it. I can move around the Roku menu with the remote and I can hear it moving around and selecting things. I tried the RESET button on the main board dozens of times as well as the remote bottom combo to reset the tv.

    I ordered a replacement main board and power supply from eBay and put them in last night but STILL no picture. I get exactly the same results. The main board in my tv is 30800-000559 40-MR17T4 and the board I received from eBay is 30800-000498 40-MR17T5. I don't know what the technical difference would be, but visually there is a very slight difference. The T5 has an IC that isn't on the T4. I've read that these boards are largely interchangable between this series so I'm a little confused. The power supply board is the exact same model number as mine despite a different PCB color and slightly lower voltage caps.

    Is this replacement board not compatible or possibly bad? It's suspicious that I get EXACTLY the same results with both boards. This tv doesn't have a TCON. There is only the power supply board and main board, so replacing both should fix just about anything, correct? The panel itself still looks brand new and the backlights are functioning fine. No cracks, scuffs, nothing. I just don't get a single line of video.

    I notified the seller that they sent me the wrong board and they are going to send me the correct one, but I can't help but think there's something else going on.

Related Topics

Collapse

  • m1ch43lzm
    HP Pavilion 15-eh Board DAG7HAMB8F0 - CPU throttling to 0.4GHz (PROCHOT_EXT) and black screen
    by m1ch43lzm
    Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
    Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...
    05-12-2025, 08:37 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
  • advant
    Driving a Sharp TCON/panel with a universal main board
    by advant
    This thread is about trying to get an Universal Main Board to work with a Sharp TCON and panel.

    I have a Sharp LC-46D85UN TV that has had a main board issue. Since this model is from 2009, I am not able to find an exact replacement of the main board. Instead, I decided to see if I can future proof this tv by getting a Universal Main Board (T53U21.2) from China to work with the Sharp TCON (CPWBX4291TPZA) and panel. The universal main board supports a 8 bit dual channel LVDS interface whereas the TCON requires a 10 bit dual channel LVDS input. I have modded the LVDS connector to match...
    02-03-2020, 12:25 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...