83Views11Replies

Author Options:

How can I make a TV remote repeatedly send a signal? Answered

Hello everyone. My parents' big CRT tv has a problem with its psu. Its probably the psu's capacitors that have died again. So in order to turn the tv on they have to click the remote's power button again and again and again for at least ten minutes until the tv turns on. It's been repaired 3 times already and because of the repair cost it's not worth repairing it again. Also because it is very big and heavy and it's very hard to move it. Their living room requires a big tv screen but at the moment they cannot afford buying a new tv.

This is how I came up with this temporary solution. Make a circuit that will automate the repetitive clicking of the remote's power button, scratch the remote's pcb paint around the power button and solder this circuit. Unfortunately I'm a beginner in electronics and I don't know how to do it. I can only assume that it is possible with the use of a 555 timer and a relay. This is where I need the community's help.

Discussions

0
None
-max-

Best Answer 4 years ago

You can probably use a 555 timer with the output wired directly to the 'power' switch (the signal portion, the long thin trace that goes to some silicon device)then when the astable 555 receives power, say from a button in series with a 9V battery, it will repeatedly signal directly to the microprocessor inside the remote which will simulate repetitive button-mashing.

You can go on craigslist, and sometimes even find old flatscreen TVs people have upgraded and don't want anymore, you might be able to pick one up for next to nother and replace the obsolete CRT technology.

0
None
myouknowwho-max-

Answer 4 years ago

So it's possible to omit the relay and just use the 555 timer circuit? That is great but I still don't know how to build this circuit. I don't know what voltage to use in the 555 timer's input, what resistors, capacitors and how to connect them. 555 timers are currently too advanced for my electronics expertise. If I use a 9v battery isn't the output also going to be 9 volts? Isn't this too much for a 3v tv remote?

0
None
-max-myouknowwho

Answer 4 years ago

There are many schematics online for 555 timers in their astable mode. It is the one with 2 resistors, and 1 or 2 capacitors with pin 3 as the output. You can see the operational voltage range in the 555 datasheet for the exact 555 you use. Use a voltage divider on the output to drop the volts.

0
None
Wired_Mist

4 years ago

There's a chance that the remote could be wearing out, Easy enough to check, Just hit the power button on the TV it's self

Have you tried a new, universal Remote?

0
None
myouknowwhoWired_Mist

Answer 4 years ago

This is not the case. The tv's relay is heard every time the power button is pressed. I can hear it twice. Once when the relay's coil closes the circuit and a few seconds afterwards when the coil opens the circuit. It's just difficult to turn on probably because the psu's capacitors are worn out again. Once it's on, it operates perfectly fine.

0
None
Wired_Mistmyouknowwho

Answer 4 years ago

Ahh, that sucks. keep in mind the if the same component is failing time and time again, there's a reason for it, maybe a short or something?

Either war, Best of luck with the remote !

0
None
Vyger

4 years ago

Try not turning it off but instead unplugging it when they are done and then plug it back in to watch it later. A lot of devices will, in a power outage event, go back to the last known condition. It just might turn on right away since that is the state that it was in. If not then it might go through a power up sequence and turn on anyway. Just depends on the model. Turning off with the remote does not really turn it off, it just puts it into a low power mode from which the remote wakes it. Unplugging it really turns it off. Only problem would be if it forgets its settings. Anyway, most devices go to a power on state when first plugged in so that might solve your problem. If the plug is hard to reach you can get a power strip with a rocker switch and just flip the switch. I would try doing this before any other more expensive or complicated solutions.

0
None
mpilchfamily

4 years ago

How about an easier solution. Get it to turn on and leave it on. When they are done watching switch to a blank channel and turn off the volume.

0
None
verencempilchfamily

Answer 4 years ago

That may work. But apart from the useless power consumption (which may or may not be a concern depending on what you pay for electricity) - there is a device near the end of its life time and it's forced ON without even being used. If it is used for a good part of the day it won't matter much, but if it is normally used only a few hours the cure may make it worse. Anyway, good enough for a short time solution.

0
None
rickharris

4 years ago

Try pressing a channel button instead. With our Tv this turns it on more effectively than pressing the on/standby button on the remote.