Symptoms like this are either caused by a defective inverter board or a problem with the 24Volt supply going to the inverter. Try to shine a light on the screen of your LCD TV and see if an image is visible on that part where the light is shining. If an image is visible then the Scaler board is good. Possible trouble may be caused by a defect in the inverter boards, backlight or the lcd panel.
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Hello The power supply regulator board to your set has the fault. If you try to open the set, or try to repair it by yourself, the warranty will void. The set must have warranty as it is new. Why do you spend for it? Just contact the nearest authorised service center for Sceptre. the components in this set will be very hard to get from open electronic spare part market, and will costly too.
According to polaroid the backlight and lcd panel are the same component, I thought I had a similar problem and bought a new screen from them only to find out it was the control box, and they want another 200 dollars for it. So I have a reconditioned 32inc lcd screen for sale if your interested, its still in the box,
Problem: Samsung LTM1755B with only a blinking yellow LED when you try to turn it
Solution: I just had one of these come in. I opened it up, and found
the U501 capacitor a little suspicious looking, in that it had a
deformed top. It was a 470uF 16V electrolytic 105degC 10mm x 12mm. I
replaced it with a very good quality 1000uF 16V electrolytic 105degC
10mm x 16mm Nichicon UHN1C102MPD. After that repair, when I tried to
turn it on, the LED was yellow for a second, then green, then I got a
picture, and it appeared to work great. I then asked the owner a week
later how it was working, and they said it was working just like new!