Hello!
I'm a few days old into this TV screens repair universe so please bear with me.
Recently, and all of a sudden my 40” 4K Sharp Aquos LCD TV turned on with colors all smudged in some places on the screen that remain like that even without any kind of video source. I do have image but the colors are smudged/tinted/ washed out in patches as per defects. This to me looks similar to burn in but I'm shore this is not an OLED.
- I did the classic unplug and hold power button to discharge the caps but it didn't help.
- I did a factory reset as well - no change.
- I also started to measure some voltages from the main PSU and I get stable voltages (5v, 12v).
- I also measured most of the labeled test pads on the scalar-T-con combo board and I get stable 1v8, 3v3, 7v and 12v.
I tried doing the tape trick to narrow down the issue but the panel ribbon cables are soldered to the scalar/T-con board so I can't do that.
The backlight seems to light up uniformly if I block the video signals on the LVDS cable
I've searched online, on this forum and on a couple of electronics discord servers but I haven't found a similar issue anywhere.
Any tips or ideas on how should go about diagnosing/fixing this?
Thank you very very much.
PS. The attached video shows the burning/preshipping mode I enabled to see how the defect behaves on all colors.
I'm a few days old into this TV screens repair universe so please bear with me.
Recently, and all of a sudden my 40” 4K Sharp Aquos LCD TV turned on with colors all smudged in some places on the screen that remain like that even without any kind of video source. I do have image but the colors are smudged/tinted/ washed out in patches as per defects. This to me looks similar to burn in but I'm shore this is not an OLED.
- I did the classic unplug and hold power button to discharge the caps but it didn't help.
- I did a factory reset as well - no change.
- I also started to measure some voltages from the main PSU and I get stable voltages (5v, 12v).
- I also measured most of the labeled test pads on the scalar-T-con combo board and I get stable 1v8, 3v3, 7v and 12v.
I tried doing the tape trick to narrow down the issue but the panel ribbon cables are soldered to the scalar/T-con board so I can't do that.
The backlight seems to light up uniformly if I block the video signals on the LVDS cable
I've searched online, on this forum and on a couple of electronics discord servers but I haven't found a similar issue anywhere.
Any tips or ideas on how should go about diagnosing/fixing this?
Thank you very very much.
PS. The attached video shows the burning/preshipping mode I enabled to see how the defect behaves on all colors.
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