Chosen Solution
The TV is actually a SAMSUNG ue55ju6400k. I switched it off when i went on holiday for 2 weeks. Came back and it will not switch on. When i press the power button on the back of the TV or when i press the remote standby, the Red LED flashes on and off for about 10 seconds. I have disconnected the power then turned back on and prees the back power button for 30secs but still have the same issue. I have disconnected the power board and bell resistance tested the fuse and its fine. Don’t know how to test the VX801S capacitor. Ive resoldered the capacitor and fise joints incase of a dry joint and pulugged back into the tv but still have same issue.
Attached image of the board. Dont know what else to do. Please help
Hi @monty_a2 Not sure if this will work for your model but try it anyway. Reinstall the power board and connect it as per normal if not already that way. Disconnect the power from the TV and then disconnect the mainboard- power board cable at the power board end. Reconnect the power to the TV. The TV screen backlights should turn on and stay on. There will be no picture because the mainboard is disconnected. If the backlights do come on and stay on, measure the voltages at the power board connector where the mainboard cable was connected before you disconnected it. The voltage values should be printed on the board near the connector. If the voltages are not as specified or the backlights don’t come on, it looks like a power board problem. That is as long as this procedure is applicable to your model that is ;-) If the voltages are all OK and since the backlights are on it’s looking like a mainboard problem. Remember to disconnect the power to the TV before removing/replacing cables or working in the back of the TV unless actually testing for voltages etc Note the SAFETY warning regarding the exposed lethal AC voltage that I wrote about before Update (01/26/2022) Hi @monty_a2 , Here’s an image of your power board showing the voltage values on CNM803 pins 3, 5, 7, & 9 i.e. 13V DC. Measure between each pin and an earth point (head of screw perhaps). Do not short out any of the pins by bridging your test probe across two of them when measuring There is also an arrow on the board at CNM803 showing the location of pin 1. You can’t access the even numbered pins on the top of the board (not that you need to) you can only access the odd numbered ones on the top of the board. In the event that you had to access the even numbered ones (in this case you don’t) it would be from the underside of the board or on the front of the connector with the cable removed.
(click on image to enlarge)
