My vizio tv the indicator turns on and then slowly fade, now tv will not power on, tv a vizio 55in 502i-b1

SOURCE: where is the t-con board located in a vizio 55in tv

The T-con is usually at the top center on the rear of the LCD panel. It usually has a metal cover over it.

The Knight

• 76851 Answers
• Posted on Jun 16, 2015

SOURCE: LG 55in Smart TV , model #55ln5790. when I press power on the remote or on tv , the only thing that happens is a indicator right below the LG on front of the tv flashes red 3x. It won't come on.

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.

The Knight

• 76851 Answers
• Posted on Nov 22, 2015

SOURCE: My 50 inch Insignia tv wont power on. When I unplug it the red indicator light slowly fades out. When I replug it and hit the power button thr green light turns on but no power.

Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

The Knight

• 76851 Answers
• Posted on Feb 10, 2016

SOURCE: I have a Vizio E500i-b1 50" led tv and if I turn it off I can not get it to turn back on for hours/days....any help is appreciated!

Fault to the main power supply regulator section. 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. Surf the site with patience. 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.

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Those sets use LED backlights and the lights are driven to max luminosity. The individual LED failures cause the whole unit to cease