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.
owend379 ... please list your model number and we can assist in troubleshooting.
by jostewcrew
UN50NU7200FXzA
by owend379
@owend379 ... ty. please list the model number of the bulbs that you purchased. they will be listed on the strips themselves.
by jostewcrew
sj-BN96-45952A
by owend379
@owend379 ... okay, so the right strips were ordered. there is a possibility that one of the connectors were connected backwards when reinstalling the new part. i would check there first. ensure that positive and negative are aligned with the proper polarity on the connector. if this checks out, youll want to post some good pictures of the interconnectings of the boards along with some good close ups of the power supply and main board.
Adding images to an existing question
by jostewcrew
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