Samsung QLED QN50Q — purchased 2022 started experiencing a delay in the picture coming on in the morning less than 2 years later. Did not know the term boot loop at that time. As the loop delay ran into a few minutes did all the recommended troubleshooting, soft and hard reset, changing cables and outlet locations, no help. As the delay increased contacted Samsung tech group and allow them remote access the tv. Tech was moving too fast to see exactly what he was doing but this ultimately it was also no help. Lived with the delay until it stretched out over 6 hours. Pulled of off the back cover checked voltage on the PS. Steady 13v. Removed cable from PS to main Board, back lights came on stayed on. Removed ribbon cable from MB to panel, back lights came on stayed on. Removed ribbon from right side of panel, no picture but no loop. Removed left side same result. Saw some post with clock signal issues so tested that area. VGH was 25v VSs 5v. Did not document all the other test point at that time just confirmed there was some signal on each. Although I know I read it on number of post I wasted some diagnostic time as I did not put the jumper wire on the MB. Once I did , i could see the issue was on the right panel as it stayed dark when I removed the ribbon between panels. 3 times in different ares with different widths of tape I got a perfect picture. Problem was each time as the tv sat unused overnight or for a few hours, when I turned in on it when back into the loop. Started looking at mostly the capacitors on the right panel. I am not an expert and I am using a low end analog multimeter so I was never quite sure what I was reading. I did notice in resistance mode I would read no resistance in one direction and some in the other. Guessing this was normal. I did get some strange reading at a capacitor marked C02. No movement of the meter dial in either direction. On occasions when the tv was working I also took some voltage reading at as many capacitors as I felt safe to put the probe on. Again some voltage reading in one direct and little or none in the other. Except for C02. This had a reading of 7v on both sides. As I was going through this whole process I was always curious why the tv came on sooner or later. The only thing I could think of is at some time the unit got warn enough to cause some expansion and eliminate the loop. I did use a blow dryer on the right panel some days ago and the loop time was greatly reduced. Following this thinking after I saw these readings at C02 I put the blow dryer directly on this area. Once this morning it started within a couple minutes. I let the tv sit for 6 hours. When I turned on the loop began. I turned off and started blow dryer for a few minutes. Turn on again and it started immediately.
i am hoping I may have found at least part of my problem. Looking for experts to see if my thinking is sound. If so where would I find information on which capacitor to change out. I have seen online that it is a delicate process.
i am hoping I may have found at least part of my problem. Looking for experts to see if my thinking is sound. If so where would I find information on which capacitor to change out. I have seen online that it is a delicate process.
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