asd
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Jun 9, 2020, 1:16 PM
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Switch TV backlight on/off to save energy
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Hi, 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. Goal: 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. https://forum.magicmirror.builders/topic/503/pir-sensor-to-cut-backlight-power/ 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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