Samsung QN49Q70RAFXZA Power Cycling Issue
Hi all,
My Samsung TV display recently stopped working while I was playing PS4 (no storm or anything to indicate a power surge). I could still hear audio through the PS4 but no display. The TV kept trying to turn on but would turn off after a second or two.
I tried the obvious troubleshooting steps like unplugging, replugging, trying different outlets and power cords with no luck. Someone on another forum suggested that it may be a power supply issue so I purchased a replacement power supply board but that did not help. I then disconnected the main board from the power supply, and when I plugged it in the backlight would come on and stay on (implying that the power supply board is working). Next I reconnected the main board to the power supply board and disconnected the flat cables to the panel, and the power would stay on and I could hear audio through the tv and navigate with the remote buttons (although it would power off if I tried to load an app like Netflix with the button on the remote).
Based on the above troubleshooting steps, I think I've narrowed it down to an issue with the main board, the panel, or the cable connections, but I don't know how to diagnose any further. I've talked to a couple electronic repair stores in my area and have gotten very inconsistent advice, but it seems like it's pretty likely that it's simply a bad panel and can't be repaired. The last thing I want to do is bring it into a shop, have them charge me for 2 hours of labor, just for them to tell me that it's irreparable.
I also tried to purchase a replacement main board on eBay but the seller contacted me and said that the issue I'm having is common for the model and indicates a bad panel, so we agreed to cancel the order.
I'd appreciate any suggestions for how to further diagnose and troubleshoot this issue! I have a DMM and soldering kit if needed.
Thanks!
Drew
My Samsung TV display recently stopped working while I was playing PS4 (no storm or anything to indicate a power surge). I could still hear audio through the PS4 but no display. The TV kept trying to turn on but would turn off after a second or two.
I tried the obvious troubleshooting steps like unplugging, replugging, trying different outlets and power cords with no luck. Someone on another forum suggested that it may be a power supply issue so I purchased a replacement power supply board but that did not help. I then disconnected the main board from the power supply, and when I plugged it in the backlight would come on and stay on (implying that the power supply board is working). Next I reconnected the main board to the power supply board and disconnected the flat cables to the panel, and the power would stay on and I could hear audio through the tv and navigate with the remote buttons (although it would power off if I tried to load an app like Netflix with the button on the remote).
Based on the above troubleshooting steps, I think I've narrowed it down to an issue with the main board, the panel, or the cable connections, but I don't know how to diagnose any further. I've talked to a couple electronic repair stores in my area and have gotten very inconsistent advice, but it seems like it's pretty likely that it's simply a bad panel and can't be repaired. The last thing I want to do is bring it into a shop, have them charge me for 2 hours of labor, just for them to tell me that it's irreparable.
I also tried to purchase a replacement main board on eBay but the seller contacted me and said that the issue I'm having is common for the model and indicates a bad panel, so we agreed to cancel the order.
I'd appreciate any suggestions for how to further diagnose and troubleshoot this issue! I have a DMM and soldering kit if needed.
Thanks!
Drew
