On my Hisense 50K23DG LED TV, I have sound but no picture.

Your LED backlights are bad and need replacing, it's something you can do yourself but look at some youtube vids before attempting to do it, the panel is extremely fragile on this model set, be careful handling it or it will break then the TV is junk and the money spent on lamp strips is waisted. Also match the old strips to the pictures of new ones as this model uses 2 styles of strips, best place to buy them is shopjimmy.com

The main board and the power supply is bad for your TV and it would be more easier to buy a new TV than to try and fix the current TV that you have and that our TV could of had died on you.

Hello Kenpappas, for what you describe, it would seem like a backlighting problem
questions if you can have a bad led ?, if many times a Led, is the one that proboca the failure
The correct solution from my point of view is, replace, all the Leds
As it is not practical to replace each led in the strips
It is more practical and simple, replace the full strips of leds
I send you a video, in which they show, the procedure of replacing the LED strips on a Hisense TV
I hope you can solve the problem
Greetings Franco Dosil

Hola Kenpappas, por lo que describes pareceria problema de retroiluminacion
preguntas si puedes tener un led mal?, si muchas veces un Led, es el que proboca la falla
La solucion correcta desde mi punto de vista es, reemplazar, todos los Leds
Como no es practico reemplazar cada led en las tiras
resulta mas practico y sencillo, reemplazar las tiras completas de leds
Te envio un video, en el cual muestran, el procedimiento de reemplazo de las tiras de Leds en un televisor Hisense
Espero que puedas resolver el problema
Saludos Franco Dosil

Chances are the power supply is fine and you have shorted lamps in the panel

THE TV

i assume this is an lcd, not led tv. the flourescent backlighting's inverter unit has gone out. its usually a seperate ic card, so it is repairable, if you can source the part cheap

Perhaps the backlight LED driver board needs to re-seated.
Also check flex wire connectors for loose connection.
reseat or replace

Hi, The part number for this inverter is: 167210, RSAG7.820.5463,
it will be printed on the board somewhere perhaps on a sticky label, have a good search around all the boards if you are unfamiliar with the set. If its any help start with the smaller Boards first, the largest will be Main AV and the Power Supply

Hi check the links hope it will help you
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience
http://electro-medical.blogspot.com/

LCD LED TV Repair No Image Blank Black Screen Flashlight Test How to Fix...

This is either the backlight or the backlight power supply that has failed. The unit is LED and those units push the LED lights to the maximum limit for brightness and the lights fail.. It is not as simple as changing a lightbulb though. The LED lights come in a strip and have to be ordered. They are soldered and glued or taped in place.