Usually it is not a good idea to unplug or plug in HDMI cables with the device (either end) still turned on or even powered on as this can damage the HDMI controller in the device.
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Usually it is not a good idea to unplug or plug in HDMI cables with the device(s) at either end, still turned on or even powered on as this can damage the HDMI controller in the device.
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Having said that faulty HDMI controllers shouldn't prevent the TV from starting either unless it also managed to damage the power feed which supplies the controller but also "may", (stress may only as I don't know the TV) feed other circuits as well.
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Having said that faulty HDMI controllers shouldn't prevent the TV from starting either unless it also managed to damage the power feed which supplies the controller but which also "may", (stress may only as I don't know the TV) feed other circuits as well.
It may well be that you have what is known as a "double header" i.e. 2 faults. One in the mainboard and one in the power board.
This is only a guess on my part but since you have replaced the mainboard depending on the cost maybe try changing the power board and check. Try to find a supplier that accepts returns in case it isn't the problem.
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if it does work then you won't know whether it was the power board or both but it may not be wise to try the old mainboard again in case it now damages the replacement power board because it was also faulty
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if it does work then you won't know whether it was only the power board or both but it may not be wise to try the old mainboard again in case it now damages the replacement power board because it was also faulty
@Scott Sterner
Usually it is not a good idea to unplug or plug in HDMI cables with the device (either end) still turned on or even powered on as this can damage the HDMI controller in the device.
Having said that faulty HDMI controllers shouldn't prevent the TV from starting either unless it also managed to damage the power feed which supplies the controller but also "may", (stress may only as I don't know the TV) feed other circuits as well.
It may well be that you have what is known as a "double header" i.e. 2 faults. One in the mainboard and one in the power board.
This is only a guess on my part but since you have replaced the mainboard depending on the cost maybe try changing the power board and check. Try to find a supplier that accepts returns in case it isn't the problem.
if it does work then you won't know whether it was the power board or both but it may not be wise to try the old mainboard again in case it now damages the replacement power board because it was also faulty