Greetings, I'm trying to repair an old Samsung LE 32R72B TV. It seems to have an issue with its brightness levels. To be more specific, it seems to shift between 3 "states" as follows:
a)Brightness at normal levels
b)Brightness at greatly reduced levels (it usually powers up in this state)
c)Picture divided in 3 different brightness levels/zones (!)
There doesn't seem to be a pattern in which these appear, but usually when I power the TV, its brightness level is greatly reduced and after a while it gets divided as in c).
I have provided photos showing the effects.
The power supply seems to be in fine condition, no leaky or bulged capacitors, although I did replace a few of them just to be certain. I have measured all the voltages and they check out okay!
The issue doesn't seem to originate from the backlight bulbs, I have access to them from the backside of the TV and they all seem to produce the same levels of light.
I'm thinking it might have something to do with T-CON controller that drives the panel or maybe even the panel itself. I might be able to replace the controller board, however I need to be sure it's not the panel.
What's your opinion on this? Am I completely wrong here? Has anyone witnessed anything like this before?
a)Brightness at normal levels
b)Brightness at greatly reduced levels (it usually powers up in this state)
c)Picture divided in 3 different brightness levels/zones (!)
There doesn't seem to be a pattern in which these appear, but usually when I power the TV, its brightness level is greatly reduced and after a while it gets divided as in c).
I have provided photos showing the effects.
The power supply seems to be in fine condition, no leaky or bulged capacitors, although I did replace a few of them just to be certain. I have measured all the voltages and they check out okay!
The issue doesn't seem to originate from the backlight bulbs, I have access to them from the backside of the TV and they all seem to produce the same levels of light.
I'm thinking it might have something to do with T-CON controller that drives the panel or maybe even the panel itself. I might be able to replace the controller board, however I need to be sure it's not the panel.
What's your opinion on this? Am I completely wrong here? Has anyone witnessed anything like this before?
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