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The backlight is not working.
Either part of the power supply board is not working or the backlight LEDs are not working.
Unfortunately, you'll have to take it to a TV repair shop. Get a quote on the possible repairs first. Check for reviews on the repair shop.
Don't open it up yourself, there are hazardous voltages even when the TV is unplugged!
Hello As you thinks mey correct to an extent. If backlight inverter board has some kind of short with its components, the fault you describes here will occur to LCD TVs, irrespective of Brand and Model. Most of the backlight inverters for any models are available at open electronic spare part shops at your town. Just take the backlight inverter board out from your Tv. It will have a special number printed on it, and should be noted when buying a new one. Remember its connections when you take the boaed out from your set. If needy, mark the positions of connecting wires to that borad on a piece of paper, for reference. Replace the backlight inverter first. It must solve the problem of your BenQ LCD Tv. OK. gopakumarg43
Tries tv unplung,replug it back like about an hour later.For the tv to do a resetting itself back to the factory setting.Tv now 50/50 the tv might work as normal again.If the tv dosen't.Tv have a dead 1 or 2 backlight buffers boards have to be replacing.These 2 long backlight buffers boards only job are to provided a tv plasma screen panel for a backlight to see the picture.Tv now the plasma screen panel have no backlight that why ur tv have only audio sound and no picture.No experience in tv repair and never done any electronic board parts replacement before.Best just call many tv shops and explain the tv situation it in and get the best quote prices for parts and labors.Best prices parts and labors should be around $400 is fair more than that as i said shops around for more tv repair shops.
yes; you can replace the back light of your lcd, when you remove the back cover of your lcd you should remember all the parts that you will try to remove specially the screw, then you will see a rectangular pcb in the other side it has a small transformer this pcb is the inverter of the backlight of your tv try to follow the wires that is connected to this inverter and you will see the back light of your lcd, try to check the tube both end if there is black color then it indicates that the cathode tube is already damage.
It seems that the "backlight" has gone bad. "Backlight" is the device that allows to see the picture in an LCD TV, when they are about to go bad the symptom that you describe is very usual. It depends on the tv manufacturers and model to expect how long the "backlight" is going to last in a tv.You can shop around for a replacement part and try to do it yourself or take it to an especialized technician. Good luck..
The problem is that your TV's backlight has gone out. Without this light, the display still works but you can't see anything. It may be that the backlight lamp has failed. But a more common cause is failure of parts called capacitors in the set's power supply.
I've never worked on a Polaroid, so I can't point you toward any specific parts numbers or values. You may be able to find more detailed information by searching for your specific model and "backlight repair". Capacitors are cylindrical parts that vary in size depending on their value. When bad, they often have tops that are bulging (should be flat) or have split open, and sometimes there may be discolored areas at their bottoms from leakage. Replacing bad ones with parts of the same capacitance value (marked on the part in mf or uf, as in 330uf) and a slightly higher voltage rating often fixes the problem. (Not always, because other things can go wrong.) Capacitors also have a polarity, so you need to make sure the new part goes in the right way.
A TV service shop could check the set if you can't find more information or don't want to try it yourself.