1 Flicker and fade to black.
Hello, I have a 43 inch RCA / Roku television.
Model: RTRU4328-C-CA
The image sparkles. In cool weather, it lasts a few hours. Above 24 degrees celcius, it hardly takes a few seconds and it's a loooong fade to black with white vertical streaks overflowing the white areas. (Sorry I don't have time to capture it)
My question: Should I change the power supply or the motherboard? (My logic would like me to change the power supply which heats up and which starts to malfunction (?))
No capacitor bulge, no trace of heating. Ideas? Many thanks!
Hi @damiendurocher,
Is there still audio when this happens?
Try shining a torch at an angle close to the screen when the screen turns black, to check if you can see any images at all. They will be very faint if they are there so trying in a darkened room may help.
jayeff さんによる
@jayeff Yes, audio is still working. I think that the backlight controller is overheating, I cannot left my finger on it's heatsink more that a second. (While the other board is just warm) I've just opened it to reproduce the fade to black, I'll check with a torch when it'll heat up! Keep in touch :)
Many thanks for your comment! :)
Damien Durocher さんによる
@damiendurocher
I can't find a user manual for your model or any RCA Roku TV for that matter but with some other newer smart TV models there is an option in the Settings > Picture menu to adjust the brightness of the backlights.
It actually states backlights as opposed to "brightness" or "temperature" etc as in the past although these may still be there as well.
If your model has this setting option try adjusting it down from maximum (if it is there) to a level that is still acceptable viewing by you and check if the overheating problem still occurs.
Overheating is caused by excess current flow but if the backlight LED were faulty they would have burned out and this would have become noticeable.
It could be that the backlight power circuit has a protection feature that prevents this from happening by shutting the circuit down but this is only a guess as I don't know.
If there are still images when the screen is black then it does point to the backlights (or whatever controls them) and not a mainboard problem in general as audio and video are still working
jayeff さんによる