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Hi. I wonder if someone can help Just a few minutes of turning on the TV there was a loud bang then the tv power was lost. There was no smoke or smell. It appears that there is a tiny component with black around it on the power board. I was advised by someone that I could replace the blown component on the board, but that could mean the cause of it to blow could still be there and was advised to get a new power board. I contacted LG but they said they don’t sell internal boards to private individuals. I looked on ebay and found several boards that looked identical but was warned by the sellers that the numbers had to match up. It wasn’t clear where i find these numbers as it just said sticker and the only sticker i could find looked more like a serial number. Also these boards were around 50€ which seems expensive for a second hand part I have no guaranty is going to work itself Can someone tell me what would be my best course of action? Especially if they have had a similar experience. The TV is jsut over 6 years old. Its an LG 42LN5708
Hi, I cannot find a schematic for the board (EAX64905301 (2.3) to find out why the diode overheated but looking at the board it appears to be connected to the primary side of the power supply between the transformer and the power switching transistors. You could check if the power transistors near the diode are short circuit or not and also check if the fuse blew at all. After that if the transistors test OK then try testing the capacitors around the diodes to make sure that they’re not short circuit either. If all test OK then perhaps it was just a case of the diode failing. You could try just replacing it (use the specs from the one next to it) and check what happens ;-) Other than that, without a schematic the easiest option is to replace the board. I found a board, no doubt the same one as you found. If you live near Bolton you could always ask if local pickup is available to save the shipping cost
This looks like a popped diode. Any electronics repair shop could fix. The big question is if there is another problem or short that caused this to fail. Start by trying to identify the number on the popped one. Then search it out. Make a few calls to local shops. https://www.build-electronic-circuits.co…
