Hola Christian, por la falla que describes, parecer?a ser un problema de fuente de alimentaci?n, podr?as tener los capacitores hinchados, esta condici?n puede generar la falla que comentas
Si tienes conocimientos t?cnicos, puedes reemplazar los capacitores hinchados y alg?n otro cercano
Te envio un video
Espero puedas recuperar el monitor lo antes posible
Saludos Franco Dosil
Hello Christian, for the failure that you describe, it would seem to be a problem of power supply, you could have the capacitors swollen, this condition can generate the failure that you comment
If you have technical knowledge, you can replace the swollen capacitors and some other nearby
I send you a video
I hope you can recover the monitor as soon as possible
Greetings Franco Dosil
The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
This is usually a problem on the high voltage board. When you first turn it on, the main board does it's P.O.S.T., then powers the HV board. You'll be hard pressed to find a replacement for it. You MIGHT find someone that can rebuild it, but for the money? Time for an open box special at you local electronics place.