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If there is no 7.5V DC standby power at the test point then it is a power board problem.īe safety aware when working in the back of a TV when the power is connected as there is exposed lethal AC voltage on the power board. Troubleshooting Steps Make sure all power cables are plugged into working power outlets for the TV and for your X1 TV Box. If it is then it may be a mainboard/power board cable problem or a mainboard problem as the mainboard turns on the red standby power light if it is receives the correct voltage signal from the power board. If the fuse and MOV test OK then connect power to the TV and check if the Standby voltage is appearing on the connector test point as highlighted i.e. We are talking 1-2 milliseconds here for it to subside. If you insert a standard fuse of the same rating it will blow straight due to the high inrush currents when the power is first connected, whereas the slow blow will hold until this current has subsided. If the fuse has blown replace it with an equivalent slow blow fuse (rating marked on board near fuse and also on fuse end caps e.g. Can't turn off TV with remote or on the set (blue on/off light won't turn red when the screen is blank) I have to unplug TV to turn it off 3. TV screen won't turn on (red on/off light will turn blue, but screen is blank) 2. These are the components that usually fail if there has been a power surge due to a storm or outage. I have a 15-month old Polaroid 4641-TLXB, which has the following symptoms: 1. There is no image, I can just see that the. The power, unless unplugged, continually turns the tv on and then off. Howdy all, As stated my tv suddenly went black while watching it last night. Here’s an image of the power board, showing the slow blow fuse (white glass fuse) and the surge suppressor (green MOV). UN55MU8000 turning on and off, no image, red light flashes once with each power up/down. Hi than proving that the TV power cord is faulty or not by either disconnecting it from the outlet and the TV and testing it with an Ohmmeter or trying a compatible replacement cord, there are no other options except than to take down the TV from the wall and remove the back cover so that the power board can be inspected and tested.