My replacement LED strips got delivered today for this LG 32LF561V which had its backlight fail a third time, despite reducing the output current last time around, so I decided to just get a full set.
I left the back off for now since I want to hack in a couple of extra features I've grown rather fond of owning higher end sets.
Namely, backlight strobing with Vsync for better motion and an ambient light sensor.
Since backlight circuit operation isn't that different among different TVs there's no reason for this to not develop into a generic solution you can apply to any LED TV and even CCFL based ones.
I'll start with the strobe feature. First of all, we're going to need a sync signal. I have a service manual for my TV and looking around for a bit made it extremely obvious where I would get that: Pin 19 of the SCART socket, SYNC_OUT. Interfacing that to the backlight driver is probably a job for a basic 555 timer monostable circuit. Nothing fancy.
The light sensor otoh is going to be more interesting. I'll probably end up cutting open a metal can transistor to make it photosensitive as photoresistors or photodiodes are specialized parts that can't be found in your junk box. I thought about repurposing an old ball mouse, but iirc the sensors in those only respond to IR, which is probably not adequate.
I left the back off for now since I want to hack in a couple of extra features I've grown rather fond of owning higher end sets.
Namely, backlight strobing with Vsync for better motion and an ambient light sensor.
Since backlight circuit operation isn't that different among different TVs there's no reason for this to not develop into a generic solution you can apply to any LED TV and even CCFL based ones.
I'll start with the strobe feature. First of all, we're going to need a sync signal. I have a service manual for my TV and looking around for a bit made it extremely obvious where I would get that: Pin 19 of the SCART socket, SYNC_OUT. Interfacing that to the backlight driver is probably a job for a basic 555 timer monostable circuit. Nothing fancy.
The light sensor otoh is going to be more interesting. I'll probably end up cutting open a metal can transistor to make it photosensitive as photoresistors or photodiodes are specialized parts that can't be found in your junk box. I thought about repurposing an old ball mouse, but iirc the sensors in those only respond to IR, which is probably not adequate.
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