REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday, 26 February 2019

HOW TO REPLACE THE INFRARED SENSOR IN A TV

HOW TO REPLACE INFRARED SENSOR IN A TV


Infrared sensor is a component which receives the infrared rays emitted by the remote control handset, and amplify them to digital signals, which in turn processed by main system control IC.  As we push different buttons on the remote control handset, infrared rays of different frequencies are emitted from the infrared emitting diode, fitted at the front side of remote control.  Frequency of emitting signals for each press of remote buttons will be unique to each other.  Infrared rays thus emitted from the remote control will pass through a small window at the front panel of every TVs, which in turn fall at the infrared sensor fitted just behind this infrared sensor window of the   There are so may types of infrared sensors, used by several brands.  A typical one will look somewhat brownish black in color, and will have three solder terminals. See some types.
Here you can see many types, but all of them have only three solder terminals.  This component is nothing but a photo transistor and an associated pre-amplifier section to amplify the signal falling on to the base of the photo transistor.  As you know, the infrared rays are invisible to human eye.  But it can be sensed bu the photo transistor inside the infrared sensor. 

The sensed signals will then passed to main system control IC for process. If the infrared sensor have some internal fault, these signals cannot be send to main system control IC, and the TV set won't respond to remote control, even-though the remote control is perfect in all respect. See some equivalent schematics and see how the infrared sensor is connected to.



Just see, out of three solder terminals, one terminal [3] will be soldered to ground, an other one [2] is connected to an outside transistor via a resistor, and the third one is connected to +ve power supply via a current limiting resistor. In  some sets, these sensors will be connected directly to certain pins of the main system control IC directly, as shown above.
How to replace them is our question here.  It is very easy for anyone who have knowledge in electronics.  Just locate this device behind the infrared sensor window at the front panel of the TV.  you have to open the TV, and unscrew out the circuit board fitted behind the front panel of the TV.  In some sets, it will be connected to main circuit board itself, and when we push in the main circuit board into the set, the infrared sensor will come just behind the infrared window at the front panel of the TV. The design will be thus. 
To replace it, you have to unsolder the three terminals, and take it out.  It will have a number printed on it [usually can be seen at its side].  When buying a new one, insist on same number, because some type will have special characteristics.
This component is very easy to get from most of the electronic spare part selling shops at your town, and won't cost more. Replace it with same mounting as the damaged one was.  There will be one terminal apart from the other two.  You can detect it very easily, and can locate the position.
Posted By: FRANK at 05:22
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