Chosen Solution
So I decided to replace the LED edgelighting on my TV as the vertical shadow was getting really annoying. I tested everything before installing the parts and things worked good, no problems with the board or the parts until I put the TV back together. Plugged everything in and now I have a blown AC fuse. I ordered a new board but something tells me I have a short somewhere in the system. Any ideas? Could there possibly be an issue with the new parts or with something else that happened during the installation process? Edit: Here are some images
Update (07/09/2020) Well in the process of repair somehow I managed to crack the LED screen. Don’t know when or how as everything was fine during the LED installation process but at this point it’s no good anymore so looks like that’s the end of my journey, thanks for your help.
Hi @owend379, If you have spare T5A 250V fuses localize the problem by elimination. Disconnect power from the TV if connected Check that fuse is OK on the power board Disconnect the power board cable from the mainboard. Disconnect the LED power cable from the power board. Connect power to the TV. Check if the fuse holds. If the fuse blows there’s a problem on the power board. What is the board number of the power board? Usually it is a BN44-00932C If the fuse holds check that there is approx. 280V DC on the power board LED power cable connector. Also check the voltages on the power board’s mainboard cable connector are as per the values marked on the board near the connector. If the voltages all are OK, read on. Disconnect power from the TV. Reconnect the LED power cable to the power board. Reconnect power to the TV Check if the fuse holds. If the fuse blows then there is a problem with the LED array. If the fuse holds, the LED backlights should turn on full and stay on until the power is disconnected from the TV. Also check the voltages on the power board’s mainboard cable connector again that they are as per the values marked on the board near the connector. If OK there may be a problem in the mainboard By way of explanation when power is connected to the TV the power board supplies the standby voltage to the mainboard to say that power is available and the mainboard turns on the red power standby power light and it also prevents the power board from turning on full i.e. it stays in standby mode. When the TV is turned on the mainboard signals the power board to turn on full to supply the necessary power for the LEDs and the mainboard and tcon (via the mainboard. With the mainboard disconnected the power board turns on full when the power is connected to the TV so this means that the LEDs turn on as well as all the necessary voltages e.g. 12V supplies are now available. so that they can be tested etc.
