Repair of remote control with homemade graphite varnish
Sometimes remotes from the TV and other home appliances are out of order, it appears as “jammed” keys. so the key worked, it is necessary with force to press several times. The weak point of many remotes are rubber pins that are fixed on the keys themselves and when you press them they close the special pins on the board. Over time the conductivity of rubber contacts decreases, they deteriorate, especially the most used buttons. Repair kits are specially made and sold for the repair of remotes that contain a set of flat conductive contacts, which are fastened over the existing ones, but you still need to find and buy such a kit. and you want to fix the remote control here and now. You can use another way by restoring the conductivity with self-made graphite varnish. To make it you need a simple pencil and a drop of Tsapon-lacquer, or any other similar, up to the nail polish.
In this case the old remote control shown on the photo above will be restored. Pay attention that many modern remotes are equipped with keys with metallic contacts, like tactile (tactile) keys. For their repairing this method will be inappropriate.
First of all it is necessary to open the remote control, most often the two halves of the case are held by latches. It is necessary to find a place, for example, on a corner of the case, in a small gap to slip a thin object, very convenient for this purpose to use a guitar pick. You must unfasten the latches all around the perimeter without breaking them or damaging the edges.
Now you can see how the board is on one side of the body and the “keyboard” itself with conductive contacts on the other. At this stage you can wipe the surface of the board with an alcohol solution. sometimes keys do not work properly due to the fact that it is covered with dust or dirt.
What you will need:
Before repairing the remote control you need to determine which buttons are no longer working. This is very easy to do if you look at the IR diode through the camera of your cell phone when you press it, because with the naked eye its flashes are invisible. It will glow on the working buttons. Broken buttons are marked with a pen or marker pen so you don’t have to rebuild them.
It should be wiped on the back with a cotton swab soaked in alcohol, especially in front of the buttons.
Now you need to rub the lead from the pencil on the file. It is important that it be graphite. This can be checked by measuring the resistance on it with a multimeter. Graphite is low, chemical pencil is high.
Everything is mixed and applied one drop at a time to the back of each non-functioning button. This can be done with a paper strip.
Then the buttons are dried with a hair dryer or set aside for 5-10 minutes to allow the mixture to dry. After that the remote control is assembled back. After such repair each button will work like a new one unless the rubber band is worn out or out of shape of course.
How to bring a TV remote control (or something else) back to life
Dratuti! Perhaps the following is written all a long-known fact, but I found no such articles, all the following information collected from several forums.
Surely everyone has often experienced a situation where the remote from the TV (or DVD-player or etc.) does not work normally.п.), т.е. Some of the buttons work, and the most frequently used buttons stop working.
What could be the problem? There are two possibilities: either the remote control or the TV.
To find out who is to blame you need a cell phone camera (or any other digital camera) look at the remote control LED and press the buttons on it. If the LED diode lights up when you press it, but the TV does not work, then the problem is in the TV and you need to think what to do. And if, when you press the working buttons, the diode goes off, but the nonworking buttons. If the LED does not work, then read on.
What’s the point? When you press a button on the remote to the circuit is pressed in the button is a nickel with a conductive coating and contacts on the circuit are closed through this same conductive layer and the signal passes, the remote gives the command. Here, as often happens, on the most used buttons (volume, on/off and channel switching) this very layer is bluntly erased and there is nothing to conduct current.
Actually turns out we need to restore this conductive layer.
Disassemble the remote, take out the rubber part of the buttons and glue a piece of aluminum foil on each nickel (regular foil). That sounds like a wild card to me. Of course you can not cut the foil directly to size, and pour glue on each nickel and stick the foil pieces larger, and after curing the adhesive tear off. But I did not dare on such a thing.
there is such a thing as conductive adhesive Contactol (not advertising). Here you go:
Buy it at a radio parts store or, if you live in the ass (like me), you can try your luck at auto parts stores, maybe you’ll be lucky.
With this very glue you need to smear the pads of the remote and the conductive layer will be restored. On some forum, a guy wrote that he does this for money to all kinds of people. free idea for a startup.
BUT! Kontaktol adhesion to the rubber apparently not very posh and this restoration will last 2-3 months. So you need to pre-mask all the nickels with superglue, which adheres well to the rubber, and on top of that already kontaktol.
Dismantle the remote, take out the rubber band with buttons and very desirable degrease it with degreaser.
Dip all the buttons buttons with superglue (the easiest way is to pour a drop of glue on something not absorbing (like a piece of plastic) and dip a toothpick in the drop and it dab the buttons. I applied directly from the tube on the heels and poured too much round, it was not particularly beautiful.
We are waiting for the glue to dry (read the instructions). Should turn out something like this:
Apply a toothpick Kontaktol. Try to grease the heels of the whole, but do not pour too much, too, otherwise the leaked glue can close the extra contacts and nothing good will come out of it.
Waiting for drying contactol. We get this (mine is not particularly nice, but yours will certainly be ZBS):
Enjoy the laziness, now you do not need to get up off the couch again.
On the forum promised that in this scenario, the remote control will serve at least half a year, and with the correct execution of all actions more. In any case it’s much cheaper than buying a new remote or a universal one (which is not sure it will last longer, t.к. they are often crap). If something is not written. Ask in the kaments.
Contactol was about 200. Repaired them for 4 remotes, a couple more just enough. So it’s not expensive per remote control. Super glue is not expensive, the cog was included with kontaktol (or you can steal it in the school cafeteria if you’re a bad guy).
The sequence of steps
Simple instructions for opening almost any modern remote control:
- Examine the remote control for fasteners. Some manufacturers put some of the screws in the battery compartment. Remove the batteries;
- Take a screwdriver of the right size and remove all the fasteners;
There may be a difficulty in asking. but how does LG, which has no screws on it? Pay attention to the joints on the sides of the device. You need to create gaps in the joints, then widen the gaps and pry to remove the plastic casing
The instructions are step-by-step, with a description of the nuances:
Check the joints on the case. If they are glued together securely, use a knife or flathead screwdriver.Use them to pick up the edges of the case until the edges come apart;
- To disassemble the remote from the TV Sony Bravia, as well as many other devices of this type, you must use a knife to push aside the latches located inside the case. Do not pull the halves of the case in different directions, walk around the edges with the blade and feel the hidden fasteners. Gently squeeze them out;
- Use a plastic card to run it over the joints between the cases to finally unclog the plastic and open the pistol;
Remove the keypad; Carefully unscrew the chip without removing the sensor;
Carry out the necessary manipulations to clean or repair the product.
How to open the remote control if the plastic sits on the fixing screws and you can’t find a Phillips screwdriver nearby? The fasteners can be twisted with the tip of a knife. It will be convenient to take a knife with a curved blade at the end for this purpose.
Philips remote controls are easy to remove with a pair of tweezers. On the Philips, the top cover fastener may be slightly recessed in the plastic back surface. How to disassemble the remote control correctly in this case? Gently pry the cover along the joints, preferably not with the blade. A knife can scratch the cover and spoil its appearance. There is also a danger of accidentally walking over the buttons with a sharp edge. If you damaged something, it’s OK. remotes from other popular manufacturers are not expensive and in some cases are interchangeable.
Model rmctpj1ap2 is an original remote control from.
The disassembly process is not fundamentally different from the circuit already described. If you still can’t open the remote control, try pushing from the narrow edges to get the plastic to slip out of the grooves.
No TV response
The TV doesn’t respond to your attempts to turn the volume up or down, change channels or change settings. These consequences are possible due to the following reasons.
Batteries ran out of power
You can easily find the defect with a tester, multimeter or voltmeter. Checking the power supplies. There should be at least 1.3V on them. If at least one of them does not have this potential, buy new batteries.
It is very important not to swap plus and minus sides when changing batteries. The positive terminal is in the form of a flat wire spiral and the negative terminal is in the form of an elongated.
If you find that the problem is not with the batteries, look at the following.
Did you drop the remote control on the floor
This option involves several different cases:
To determine why the TV remote does not work, you must disassemble your “friend”. This is done with caution in the following order:
- Remove the cover and remove the batteries.
- Looking to see if there are any screws underneath and on the remote itself with which the case is screwed. If there are, unscrew them; if not, snap them off.
- Inserted carefully between the halves of the remote control housing knife, screwdriver or an old card (plastic).
- Turn the object slightly so that the halves are slightly apart. You should hear a click. This will mean that one of the latches has opened.
- Spread the device along the line and open the other locks until they all snap.
The red arrows show items that need to be carefully inspected and shaken. If they move in relation to the board. you need to solder.
If on examination it is found that the board itself is cracked. it is possible to repair it in case this crack has passed only under the parts, as shown in the photo.
It is necessary to solder all the broken wires with the corresponding counterparts so that they are not short-circuited.
If the crack is under the black resistive layer applied to the board, you need to buy a new remote control device. It cannot be repaired.
- Prepare a clean sheet of foil, cut out of it circles (the same size as the buttons);
- Using glue “Moment” attach cut out elements from the back side of the overlay (right where the buttons touch).
Tip! In radio stores you can find kits designed to fix the damage of the remote control. They contain glue, ready-made circles of special conductive rubber. They should be smeared with glue compound, then glued to the appropriate places.
If R/C after cleaning and changing pads doesn’t work, you should take it to a repair shop or buy a new one. To replace the resonator, LED or capacitor, to make other repairs, you need to use a soldering iron.
Ready-made kits, designed to repair remotes, greatly facilitate the process of resuming the operation of the remote switch Source peugeot-club.by
Types of breakdowns
Quite often the remote control repair depends on the type of failure, or rather the severity of the malfunction. In any case, whatever the malfunction, it can cause a lot of problems.
But if you know the types of failure, you can easily fix them with your own hands.
In most cases, there are several types of remote control breakdowns:
- frequent falls, which could lead to failure of quartz and important elements; may not respond to certain keys, but when you press others. this is not observed; lack of work for frequently pressed buttons; sometimes you must press them hard in order to make the buttons work; remote control works, but only at close range.
It is worth noting: not always the lack of response when pressing the buttons can be a consequence of failure of the device. The batteries may have just run out and can easily be replaced.
But identifying the cause is half the battle, you need to know the repair procedure. Therefore it is worth considering a detailed troubleshooting procedure. The difficulty of repair depends directly on the type of failure.
Brought a Soviet electronic clock with a lifetime warranty
I decided to share with you the photo-report of repair of unusual electronic watches of times of the USSR, but in the end of repair the plot suddenly turned on 180 degrees.
Sergey Egorov brought up next rarities from the Soviet Union, among which I was immediately interested in unusual homemade clocks on discharge indicators. In those days there were a lot of homemade and industrial clocks on fluorescent indicators, but the gas-discharge. It is very rare.
Autopsy revealed that the watch was assembled somewhere around 1976. Some parts are from ’74, but most of them are from 1975.
The circuit was built on a 176 series chips, but the control of indicators on the 133 series. You can see by the mounting, that the circuit was being finalized in the process of debugging. Part of the elements are already soldered on the hinged assembly.
The engineering of the conversion of the constant capacitor into a trimmer is a matter of respect. Capacitance is changed by winding a part of the enamel wire turns.
Some resistors have burned out paint. their capacity was higher than the calculated, but they are all “alive”.
Interesting control circuit design. There are 4 buttons on the front panel: “reset”, “clock”, “minutes” and “alarm clock” (Alarm).
And four micro-switches under each indicator.
To set the time we press the “START” button and by turning the knobs of the switches we set the necessary values on the indicators. This is the mechanism of “manual sunset”.
Even though the clock is 45 years old, it still counts down.
The second watch, brought by a friend, I hadn’t planned to even mention it. It’s a 1980 Electronica industrial clock. In case you’re wondering. I’ll tell you.
Disassembled the watch and shoveled out the corpses of cockroaches. The power cord of the watch had been carefully bitten off right next to the board. I have these cords in stock. It wasn’t hard to solder them. Turning on the voltage showed that the clock is alive, but two segments of the indicators are lit permanently. The problem is well known, I quickly found faulty transistors KT361B and replaced them.
Well, since the clock is working, I decided to wash the case from the age-old dust and dirt. The case of the clock is veneered and has been varnished. The lacquer has been cracked by time and can be easily peeled off with a common brush. I’ll have to re-lacquer it.
I was about to clean the plastic case back and noticed a piece of paper sticking out of the battery compartment.
I already thought it was a quality insert. I’ve seen this kind of paper in VEF radios.
Gently pulling out a piece of paper, unfolding it. and there.
I even thought at first it was a prank from the “joke bank” series. I even looked at the watermarks on the bill.everything is in place, as it should be a real banknote of the Bank of the USSR.
It even has a unique smell!
Cracks after a fall
Remote controls can be in a variety of places, because they should always be at hand: after waking up you look for the remote on the bedside table, when you eat breakfast, the device is with you on the table, and during the evening movie show the remote is moved to the couch next to you.
They’re compact and handy, but they fall down quite often, and it doesn’t always happen on soft carpeting. If the remote control is dropped on a ceramic tile, it can get serious damage not only to the outer casing, but also to the internal microcircuits.
If after a fall remote control no longer operates, its restoration also begins with disassembly. There are three common breakdowns from the shock:
The first two faults can be determined by visual inspection. You can check the operation of the LED, even without disassembling the case:
- Turn on the camera on your smartphone.
- Point the remote at the camera so that the LED is in focus.
- Look at the cell phone screen and press any button on the remote. Through the camera will be well visible signal, if any.
You can also check the operation of the LED with a multimeter, but for this you will have to remove the outer parts of the case:
- Connect the styli of the tester to both ends of the LED.
- Set the switch of the device to 3V.
- Press any button on the remote control.
- If the tester shows voltage, then the LED is working.
After an unfortunate fall of the remote control, it may be broken contact terminal batteries. The spring pins of this connection are soldered to the chip, so make sure the solder is intact and secure. Also check the springs themselves for corrosion or warping. If the contacts are oxidized, you can clean them with sandpaper.
If you found ring cracks or oxidation in the soldering of the contact terminals and decided to re-solder them, it is correct to detach all the elements from the board, clean and tin them and only then re-solder.
But it is not so easy to check the performance of a quartz resonator. To do this you need to disassemble the remote control and find a small box with soldered contacts on its chip. If you shake it gently and hear the sound of crumbs rolling around inside, then the resonator is broken and will need to be replaced. Such a bullet can only be resuscitated by a craftsman.
If the remote control from the TV dropped on the floor and immediately after you noticed that the device is no longer working, then you should pay attention to the ceramic resonator when you disassemble the remote control.