Chosen Solution
After a lightning hit my area my TV turned off and won’t turn on again. There is no standby light. I unplugged it and plugged it back in but it didn’t work. I pressed and held the power button for 30 seconds, waited 1 minute and tried to turn it on but it didn’t. I opened the tv and checked the fuse, but they were okay. I checked the standby voltages and they were all good. I even tried baking the main board but it didn’t work either. What else can I do besides replacing the main board? NOTE: I think this issue resulted from the HDMI port because the device connected to this port doesn’t turn on either.
Hi, How many fuses did you check and how did you check them? Do not only check them visually but use a multimeter to check continuity, as many times a blown fuse might look ok. How did you check the standby voltage? Using a multimeter? Where did you measured them and what did you get? On the AC or DC side? Maybe both? Have you checked ALL areas of your TV’s boards and are you sure that there’re no signs of burnt components? Have you checked the aerial connector area? It is usually shielded with a metallic box to avoid EMI and EMC issues. If the lightning surge was close enough to your home aerial, the static might have blown some of the RF electronics withing the EMI cans, and possibly propagate the overvoltage to the rest of the TV damaging more areas of the electronics. Some times I’ve seen the RF receiver boards as independent PCBs. Check that you didn’t miss the inspection for burnt components on any board, and have a look inside the EMI cans if possible. Good luck! Edit: I see you have updated pictures. The bottom face of the motherboard seems to have quite burnt areas. I don’t know if that’s an effect of the picture, or maybe that the board has not been cleaned after a repair, or maybe because of the lightning surge. Anyways, the area underneath the aerial connector looks bad.
If the EMI can lid on the top face is not soldered to the walls of the shield, try to open it to see if it hides any damaged component. You also can try smelling around it before trying to open it. If it smells like burnt plastic…you have your damaged area.
