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It sounds like you may have a problem with the video signal on your Vizio 55 inch flat screen TV. The fact that the TV turns on and has sound, but no video and vertical lines on the screen, suggests that there may be an issue with the video processing or display.
It could be a problem with the T-CON board, which is responsible for the video signal processing. It could also be a problem with the LCD panel itself.
It's also possible that there's an issue with the cable connecting the T-CON board to the LCD panel, or a problem with the software on the main board.
I recommend consulting the manual of the TV or contacting the manufacturer for further assistance. A professional technician should be able to diagnose and fix the problem.
It's also possible that the issue is with the mainboard or the T-CON board is not compatible with the TV. Thus, it's best to check the compatibility of the parts with the TV before installing it.
If the screen is too dark on the TV or the brightness keeps on continuing to change then the problem here is with the Energy Saving mode settings. By default the TV does set the Energy Saving to Auto, which means that the TV will automatically by it's self does adjust the screen brightness depending on the brightness of light it detects.
Follow this procedure to troubleshoot a TV picture that is too dark. Refer to the manual provided with the TV if additional model-specific instructions are needed to perform any of the steps listed.
If Picture mode is set to Cinema or Custom, the screen may become dark. If the screen is still dark after the picture quality mode is changed, change the setting Backlight, Picture, Brightness and adjust the brightness to your taste.
Example of setting method: Check Picture Mode from Settings - Display - Picture and change the setting.NOTE: When a TV is in a store they are set up for Shop Front display settings which are very bright and vivid. However, some Sony TVs may be shipped with more energy-friendly settings to comply with energy savings programs such as the Energy Star. Depending on such settings, the picture brightness level can be higher or lower.
If Power Saving is set to Low or High, the screen becomes dark.
Example of setting method: Select Settings - System Settings - Eco and set Power Saving to Normal or Off, and then check whether the problem is resolved.
Some TVs have Light Sensor feature; the picture will become brighter or lower depending on room lighting conditions.
Turning off the Light Sensor or Automatic Brightness Control (depends on your TV model) may increase picture brightness.
View programming from a different source, such as a DVD player or VCR, to see if the issue is being caused by the device providing the signal to the TV.
NOTE: If the dark picture issue is displayed when viewing from one device only, the dark picture issue is being caused by that device, not the TV. Contact the device manufacturer for additional troubleshooting information.
If it is a projection TV, consider replacing the lamp.
IMPORTANT: The method to replace the lamp differs by model. Refer to the instruction manual for model-specific steps to replace the lamp.
You need to do some troubleshooting first. Turn the TV on make sure the room is dark take a good flashlight and shine it at the screen and flip through the HDMI inputs. if you don't see an image then it's most likely your main board you can have that fixed or repaired at pts electronics. If you do see an image then the backlights aren't working and you need to check the outputs to the backlights at the main board. The TV is worth fixing
Check resistors in the small PCB connected to picture tube. Check picture tube grid voltages. Check brightness control swing on the IC out put. Note down the IC no and search in the Google for pin configuration.
Most likely what happened is one of the capacitors went bad. When a capacitors goes bad it produces a popping sound. This could be an easy and cheap fix if you find the bad capacitor or capacitors. The bad capacitor will have a bulging top most likely on the power board but could be anywhere.
Hi , I recently had the same problem which I was determined to fix . So I did a few weeks of research to find that it was the Y SUS board which burns out. I'm sure you realized that the TV gets hot. Personally I think this is why. circuit boards don't like heat and I've learned that the cooling fans are a joke. I replaced the board and got my picture back. I proved the fan theory because after the screen started to act up. I placed a cooling fan near the vent holes on top and the problem cleared right up,It also helps if you lower the brightness which helps out on the heat situation.I will soon be adding a fan with a temp. sensor. This shoud help if your screen has lines when you initially turn the cool TV on.then I have Some other costless solutions. Hope this helped these are great TV's and like our cars we maintain them not throw them away..................................Mr Wiseman