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Bypassing the on/off button on TV question
RandyT:
--- Quote from: pinballjim on July 26, 2012, 12:40:47 pm ---No they don't. :lol
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If you haven't seen too many, you would probably say that. A number of years back, I dealt with this issue on a roll out of 100 DVD-based 3D kiosks. We needed to use a particular DVD player which could be computer controlled, and it didn't power up automatically. The power button was a "soft-touch" switch, which had virtually no throw to it, and no way to reliably wedge it down. Had to disassemble every one of them and bridge the switch contacts.
But as I stated, whatever gets the job done is fine.
superbigjay:
--- Quote from: RandyT on July 24, 2012, 04:41:57 pm ---Unplug the unit, hold down the power switch and plug it back in. If it comes on and stays on (be sure to wait for a while to make sure it doesn't turn back off after some time), and the rest of the functions on the TV still function normally, use whatever method you are comfortable with to duplicate this. You can take the unit apart and bridge the switch with some solder, but if appearance and reversibility isn't a concern, you can use some epoxy putty to hold it down. Just make sure the switch is held down while the putty cures.
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LOL... I know this thread is old like ... 13 years old.
But just wanted to thank you Randy!
I finished my cab in 2007, and my solution for the TV was to have a small hold in the bezel and use the tv's remote to turn it on.
I never really bother to open the tv and bypass/redirect the power button on the cab's control panel.
But lately (last month) my remote's tv stopped working and was looking for a solution.
Then saw this post... I tried it on my TV and it worked!
I simply jammed a toothpick and voilą ... my TV turn's on as everything else when the cab is powered on!
Zebidee:
--- Quote from: superbigjay on October 21, 2023, 03:37:52 pm ---I simply jammed a toothpick and voilą ... my TV turn's on as everything else when the cab is powered on!
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You can make it permanent by soldering across the momentary switch terminals, like Randy described above. Could even run wires to a throw switch.
For TVs that require the momentary switch to be pressed but then released, like some Loewe TVs I've worked with, put a capacitor (say 10uF or 100uF) across the momentary switch terminals. Make sure the polarity is right way around (+ to active signal/IC, - to GND). Likely easier to put it on the underside of the chassis, no need to disturb anything else.
This cap trick works because while the cap is charging the circuit is closed, like pressing the button. When the cap is charged (usually <1s) the circuit opens again, like releasing the button. The TV turns on.
You can adjust the "press time" by using a larger or smaller cap, or lengthen the time by putting a resistor in series with the cap.
This idea can be useful for "toothpick" TVs like yours too, because most would just need the button pressed - and then released, rather than constantly held down. Might be better for TV in the long run.