TCL 55S451 Blank screen

[x_orange90_x]

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.

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 ��

[EazyBone]

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.

[x_orange90_x]

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?

[x_orange90_x]

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.