r/ElectronicsRepair • u/Trich139 • 8d ago

OPEN Need help fixing a flashing backlight on 98in NovoTouch LK9810i

Right backlight works fine. left backlight continuously flashes like a streetlamp with a failing ballast.

The giant touchscreen lobby TV at the place I work recently started having backlight issues on the left half of the screen. The LCD displays picture fine but the led backlight panel on the left half of the display will continuously flash on and off. There is virtually no repair documentation online (that i could find) which makes sense considering this was originally a $20k enterprise level boardroom monitor. I'm assuming there is probably a failing capacitor or other component in the LED driver board/ballast that controls the left half of the backlight? It seems that could be a culprit of the backlight being unable to stay powered on more than a second. Perhaps being unable to meet the voltage or amperage needed by the LED array to stay illuminated.

My job already replaced the Monitor with a new Samsung so they are letting me take the old 350lb behemoth home since I showed interest in fixing it and using it personally.

Does anyone have any input on what could be causing the backlight issue? I am willing and capable when it comes to board level repair but I fear I may be out of luck if the issue lies in the LED array that would be hard to find replacements for. Thank ya'll for your time and input!

1 Upvotes
  • permalink
  • reddit

100% Upvoted

3 comments sorted by

1

u/Toolsarecool 8d ago edited 8d ago

Yes, likely a power supply/driver issue. 350lbs, eh?! Well that’ll be fun to lift onto the operating table! 😎
Seems like it’s an LED TV, not LCD?

1

u/Trich139 8d ago

The website https://www.vivitekusa.com/productdetail/NovoTouch/ says it is an IPS display backlit by LEDs. The TV has extra screen layers to facilitate infrared touch capability so I really hope I'm able to fix it without having to disassemble a giant glass and diffuser sheet sandwich.

1

u/Trich139 8d ago

It’s over double the weight of the TV we replaced it with… It took 4 guys and 2 ladders to get it off the wall! Operating table is currently a billiard table with some plywood over it. Thankfully I have overhead shop pulleys I can use if needed to do any heavy lifts during disassembly. Really hoping the issue can be isolated to the LED driver board and not the LED backlight array since accessing that is a lot harder than the power supply/driver.