⚡ Descuentos en cursos en video - Lleva tu aprendizaje técnico al siguiente nivel y aprovecha precios especiales antes de que termine la oferta. 🔥 Aprovechar oferta ahora 🔥
LCD TVs - LED

JVC LT-42DA940 strange glitter failure

ElectroSUR
hace 5 años
hace 5 años
Hello friends, here with this led tv and a somewhat rare fault, it turns out that the TV turns on correctly and after 5 minutes the upper and lower part of the display darkens, leaving only a horizontal backlight strip in the center of it. Checking I could see that it has only a vertical LED strip on the right side, in which its power is divided into 6 groups of 10 LEDs each, and its encouragement is 65vdc. Those were the measures I took with the TV working well, when the fault begins I managed to measure 37vcc in 5 groups of LEDs, that's why they don't turn on, and in the rest, they are the only 10 LEDs that are lit by 75vcc, more high than the work stress. I think the fault is in the plate that commands them but there is no way to get it, does anyone have an idea how to solve it? thanks!
ElectroSUR
hace 5 años

Another thing that probe was to cool the plate and the LED strip without result, so thermal failure is not ...

Responder
Victor E
Victor E
65.783
hace 5 años

For me it is one or more bad LEDs.

Responder
ElectroSUR
hace 5 años

I pointed there at the beginning but the fault is very systematic, after 5 minutes it appears, it also seemed strange that a bad LED could modify both the power values ... I don't know what you think. Thank you for your input!

Responder
Victor E
Victor E
65.783
hace 5 años

unfortunately in reality yes, the tension of work is altered and in the long run they cause the burning or destruction of another LED. The experience in my workshop demonstrates this.

Responder
ElectroSUR
hace 5 años

Thank you Victor for your contribution, I took the task of feeding the leds of the group that failed for 5 minutes one by one and the fault appeared in the last of the group, it was shortening after raising a little temperature and was sent to ground. It is incredible how the tension of the rest of the independent feeds pulls down. The electronics out there surprise you hahaha, comment below so I leave the solution, thank you very much, hug!

Responder
Victor E
Victor E
65.783
hace 5 años
hace 5 años
I'm glad I solved your problem. greetings
Reparaciones similares solucionadas

¿Conoces una solución?

¡Aprende a reparar con estos cursos YoReparo!

¿Tienes una mejor respuesta a este tema? ¿Quieres hacerle una pregunta a nuestra comunidad y sus expertos?
Regístrate gratis