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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
Switch TV backlight on/off to save energy



New User

Jun 9, 2020, 1:16 PM

Post #1 of 1 (99 views)
Switch TV backlight on/off to save energy Can't Post


I am new to this forum but found your advice very helpful in the past, so thank you first of all!

I would like to build a MagicMirror using a TV.

To save energy, I try to utilize a PIR sensor to turn on the backlight of my TV whenever someone walks by. The LCD panel however will always be on and emitting the HDMI-signal from my RaspberryPi. This solution should allow me to have a TV picture that's instantly on and does neither need to boot nor show the TV logo nor show the input source.

My TV:
Samsung UE32D5000

Related issues:
This problem has already been discussed but does not really help me to much since my hardware setup is different.

What I did so far:
My screen has an integrated LED driver on the power board (BN44-00460A). I tried the following:

1. Unplugging the LED backlight (Connector: CNL802).
Result: The TV reboots in a continuos loop

2. Disconnecting the "BLU on/off" pin on the power board (Connector: CNM803) that controls the backlight unit from the main board (Connector: CN201).
Result: The backlight is always on

Where I need help:
* Does someone know another way of maybe tricking the software of my board to think the LED's are on without them being on? I thought of utilizing a resistor but this does not really save me energy.

* Any other ideas?

* Worst case, I need a new used TV: Does someone know which TV (32" or bigger) has a separate LED driver or allows the backlight to be manually switched on or off. I could do this using a relay or via a 5V pin as proposed in the related issue described above.

Thanks a lot in advance, I greatly appreciate it!


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